Mechanical Engineering - Automobile Engineering Quiz (or) MCQ

1 .

A) self-propelled vehicle

B) contains the power source for its propulsion

C) used for carrying passengers and goods on the ground

D) All of the above

Correct Answer : All of the above

Explanation : A car, bus, or truck, for example, is a self-propelled vehicle that contains the power source for its propulsion and is used to transport passengers and cargo on the ground.

2 .

Which of the following is a classification of automobiles based on Load?

A) Front-wheel drive

B) Four wheeler vehicle

C) Heavy transport vehicle (HTV)

D) Sedan Hatchback car

Correct Answer : Heavy transport vehicle (HTV)

Explanation : On the Basis of Load it is classified as :
Heavy transport vehicle (HTV) or heavy motor vehicle (HMV) and Light transport vehicle (LTV) or Light motor vehicle (LMV)

On the Basis of Wheels, it is classified as:
Two-wheeler vehicle, Three-wheeler vehicle, Four wheeler vehicle, and Six wheeler vehicle

On the basis of body style, it is classified as:
Sedan Hatchback car, Coupe car Station wagon Convertible, Van Special purpose vehicle

On the basis of Driving Axle, it is classified as:
Front-wheel drive, Rear wheel drive, and All wheel drive

3 .

The painting of automobiles is done to

A) improve its external appearance

B) prevent rust from growing on the body

C) retain the characteristics of steel for long

D) All of the above

Correct Answer : All of the above

4 .

The main task of a battery in automobiles is to

A) supply electricity to the alternator

B) supply a large amount of power to turn the starter motor when the engine is being started

C) act as a reservoir or stabilizer of electricity

D) supply electricity to the vehicle's electrical system at all times while the engine is running

Correct Answer : supply a large amount of power to turn the starter motor when the engine is being started

5 .

The anti-knock property of compression ignition engine fuel can be improved by adding

A) amyl nitrate

B) hexadecane

C) tetraethyl lead

D) trimethyl pentane

Correct Answer : amyl nitrate

6 .

The purpose of adding pigment to the paint is that it

A) makes paint film hard

B) optimises the viscosity of paint

C) gives colour and filling up effect to the paint

D) None of the above

Correct Answer : gives colour and filling up effect to the paint

7 .

The purpose of transmission in an automobile is

A) to vary the torque at the wheels

B) to vary the power of automobile

C) to vary the speed of automobile

D) None of the above

Correct Answer : to vary the torque at the wheels

8 .

The connecting rods are generally made of ______ shaped cross-section.

A) C

B) I

C) L

D) H

Correct Answer : I

9 .

The major purpose of an electronically-controlled automatic transmission is that this type of transmission

A) eliminates gear clutches

B) eliminates the gear shift lever

C) reduces the number of automatic-transmission components

D) reduces shift shock and achieves more efficient transmission of engine torque

Correct Answer : reduces shift shock and achieves more efficient transmission of engine torque

10 .

When the top of the wheel is tilted outward, then it is called

A) positive caster

B) positive camber

C) negative caster

D) negative camber

Correct Answer : positive camber

11 .

A laminated glass upon cracking

A) bursts into granular pieces

B) breaks into the form of crystals

C) bursts into sharp edged fragments

D) sandwiched layer traps the fragments

Correct Answer : sandwiched layer traps the fragments

12 .

In a four speed four-stroke Diesel engine, the intake valve

A) opens at T.D.C. and closes at B.D.C.

B) opens at 10° after T.D.C. and closes at 20° before B.D.C.

C) opens at 20° before T.D.C. and closes at 35° after B.D.C.

D) None of the above

Correct Answer : opens at 20° before T.D.C. and closes at 35° after B.D.C.

13 .

If the valve clearances are excessively large, the problem that can arise is

A) incomplete valve closure

B) overheating of the engine

C) fouling of spark plug by gasoline

D) All of the above

Correct Answer : incomplete valve closure

14 .

The brake pedal during ABS operation

A) is pushed upward forcefully

B) pedal stroke becomes longer

C) transmits slight kickback to the driver's foot

D) All of the above

Correct Answer : transmits slight kickback to the driver's foot

15 .

The specific gravity of acid in a fully charged battery is generally

A) 1.00

B) 1.28

C) 1.82

D) 2.81

Correct Answer : 1.28

16 .

The Diesel engines are also known as

A) steam engines

B) spark ignition (S.I.) engines

C) Both (A) and (B)

D) compression ignition (C.I.) engines

Correct Answer : compression ignition (C.I.) engines

17 .

The power source for a brake booster is

A) electricity

B) hydraulic pump

C) exhaust manifold pressure

D) the pressure difference between the atmospheric pressure and the vaccum pressure in the intake manifold

Correct Answer : the pressure difference between the atmospheric pressure and the vaccum pressure in the intake manifold

18 .

Automobile can be classified based on which of the following parameter?

A) Drive

B) Fuel Used

C) Transmission

D) All of the above

Correct Answer : All of the above

Explanation : On the Basis of Fuel Used it is classified as:
Petrol vehicle, Diesel vehicle, Electric vehicle which use battery to drive, Steam vehicle

On the Basis of Transmission, it is classified as:
Conventional vehicles with a manual transmission, Semi-automatic, and Automatic

On the basis of Drive, it is classified as:
Left-hand drive and Right-hand drive

19 .

Which of the following is not a part of the transmission system?

A) Wheels

B) Clutch

C) Axles

D) Gear box

Correct Answer : Wheels

Explanation : Wheels are considered a part of the automobile chassis.

20 .

Which of these were or are used in automobiles to provide suspension.

A) Coil springs

B) Torsion bars

C) Leaf springs

D) All of the above

Correct Answer : All of the above

Explanation : All the three mentioned are types of suspension systems.

21 .

The frequency of flashing of light per minute in a direction (side turn) indicator is about

A) 9

B) 90

C) 900

D) 9000

Correct Answer : 90

22 .

An imbalance wheel during vehicle operation

A) creates a standing wave

B) deflects in the vehicle's longitudinal direction

C) bounces vertically or deflects from side to side (as seen from front or rear)

D) makes large noise when its heavy point hits the road surface

Correct Answer : bounces vertically or deflects from side to side (as seen from front or rear)

23 .

A four-cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is

A) 400 cm³

B) 600 cm³

C) 1200 cm³

D) 2400 cm³

Correct Answer : 600 cm³

24 .

Thinner is added to the paint in order to

A) optimise its viscosity

B) make paint film hard

C) make pigments and resin mix easily

D) None of the above

Correct Answer : optimise its viscosity

25 .

The ease with which petrol vapourizes is called its

A) volatility

B) oxidation

C) octane number

D) cetane number

Correct Answer : volatility

26 .

The main function of the brake fluid is

A) cooling

B) lubrication

C) Both (A) and (B)

D) power transmission

Correct Answer : power transmission

27 .

In vehicles with tilt steering, the steering column is pivoted in

A) tilt bracket

B) upper bracket

C) lower bracket

D) steering yoke joint

Correct Answer : lower bracket

28 .

The component in the radiator of an automobile that increases the boiling point of water is

A) drain plug

B) pressure cap

C) water jacket

D) vacuum valve

Correct Answer : pressure cap

29 .

The parking brakes employed in vehicles are operated

A) mechanically

B) hydraulically

C) pneumatically

D) None of the above

Correct Answer : mechanically

30 .

The condition that causes vapour locking in a brake system is

A) overcooling of the brakes during high speed driving

B) an excessively high engine speed on a downhill road

C) keeping the vehicle without use for an extended period

D) overheating of the fluid due to frequent brake application

Correct Answer : overheating of the fluid due to frequent brake application

31 .

Which of the following symptom is caused as a result of brake disc run out?

A) Ineffectiveness of the brakes

B) Judder during braking

C) Rapid wearing of the brake pads

D) Localized wearing of the brake pads

Correct Answer : Judder during braking

32 .

The motion of the cam is transferred to the valves through

A) pistons

B) valve stems

C) rocker arms

D) camshaft pulley

Correct Answer : rocker arms

33 .

If the engine coolant leaks into the engine oil, then engine oil

A) turns black

B) becomes foamy

C) appears milky

D) None of the above

Correct Answer : appears milky

34 .

It is necessary to maintain the valve clearances as they

A) allow for lengthening of the valves owing to the heat of combustion

B) make the crankshaft turn smoothly

C) increase the speed at which the valves move up and down

D) reduce the resistance to sliding that occurs between the cam and the tappet

Correct Answer : allow for lengthening of the valves owing to the heat of combustion

35 .

What type of bearing is used for main bearings and connecting rod bearings?

A) Ballbearings

B) Plain bearings

C) Taper roller bearing

D) Needle roller bearing

Correct Answer : Plain bearings

36 .

The function of an alternator in an automobile is to

A) supply electric power

B) continually recharge the battery

C) partly convert engine power into electric power

D) convert mechanical energy into electrical energy

Correct Answer : continually recharge the battery

37 .

A clutch is usually designed to transmit maximum torque which is

A) equal to the maximum engine torque

B) 80 per cent of the maximum engine torque

C) 150 per cent of the maximum engine torque

D) None of the above

Correct Answer : 150 per cent of the maximum engine torque

38 .

The PCV valve incorporates a spring loaded plunger and opens in proportion to the level of vacuum pressure in the intake manifold.

A) Agree

B) Disagree

C) Can Not Say

D) None of the above

Correct Answer : Agree

39 .

The main merit of a multi-cylinder type cylinder sleeve is

A) high rigidity

B) better cooling efficiency

C) Both (A) and (B)

D) smaller engine dimensions

Correct Answer : smaller engine dimensions

40 .

The camshaft of a four stroke Diesel engine running at 1000 rpm will run at

A) 500 rpm

B) 1000 rpm

C) 2000 rpm

D) 4000 rpm

Correct Answer : 500 rpm

41 .

The function of anti-lock brake system (ABS) is that is

A) Minimizes the brake fade

B) Maintains directional control during braking by preventing the wheels from locking

C) Reduces the stopping distance

D) Prevents nose dives during braking and thereby postpones locking of the wheels

Correct Answer : Maintains directional control during braking by preventing the wheels from locking

Explanation : The function of anti-lock brake system (ABS) is that isThe function of anti-lock brake system (ABS) is that is Maintains directional control during braking by preventing the wheels from locking

An anti-lock braking system is a safety anti-skid braking system used on aircraft and on land vehicles.

ABS operates by preventing the wheels from locking up during braking, thereby maintaining tractive contact with the road surface

42 .

The basic characteristics of a brake fluid is

A) Low viscosity

B) A high boiling point

C) Compatibility with rubber and metal parts

D) All of the above

Correct Answer : All of the above

Explanation : Brake fluid is subjected to very high temperatures, especially in the wheel cylinders of drum brakes and disk brake calipers. It must have a high boiling point to avoid vaporizing within the lines.

Low viscosity

Compatibility with rubber and metal parts

43 .

The fuel pump in the programmed fuel injection (PFI) system is located

A) in the fuel tank

B) between the fuel-filler pipe and fuel tank

C) on the engine compartment bulkhead

D) on the distributor mounting in the engine compartment

Correct Answer : in the fuel tank

44 .

Which of the following is not an automobile?

A) Truck

B) Motor cycle

C) Aeroplane

D) Passenger car

Correct Answer : Aeroplane

45 .

The materials used for cylinder block are

A) brass and steel

B) cast iron and steel

C) steel and aluminium alloy

D) cast iron and aluminium alloy

Correct Answer : cast iron and aluminium alloy

46 .

The positive plates of a lead acid battery has

A) spongy lead (Pb)

B) lead peroxide (PbO₂)

C) lead sulphate (PbSO₄)

D) sulphuric acid (H₂SO₄)

Correct Answer : lead peroxide (PbO₂)

47 .

The basic purpose of tyre rotation on automobiles is to

A) equalize wear

B) get better ride

C) avoid ply separation

D) None of the above

Correct Answer : equalize wear

48 .

The path taken by intake air is

A) carburettor (or throttle body) - air cleaner - intake manifold - intake ports - cylinders

B) air cleaner - carburettor (or throttle body) - intake manifold - intake ports - cylinders

C) air cleaner - carburettor (or throttle body) -intake ports - intake manifold - cylinders

D) air cleaner - intake manifold - carburettor (or throttle body) - intake ports - cylinders

Correct Answer : air cleaner - carburettor (or throttle body) - intake manifold - intake ports - cylinders

49 .

The calorific value of petrol is about

A) 45.5 - 47 MJ/kg

B) 36.5 - 38.5 MJ/kg

C) 42.7 - 43.5 MJ/kg

D) 39.4 - 42.5 MJ/kg

Correct Answer : 42.7 - 43.5 MJ/kg

50 .

The purpose of a cylinder head gasket is to

A) removes impurities from cylinder head lubricating oil

B) prevent engine oil from going into combustion chamber

C) Both (A) and (B)

D) prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head

Correct Answer : prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head

51 .

The ball joints are used on the tie-rod ends, because they

A) improve the force transmission speed

B) reduce the amount of noise generated

C) reduce the amount of sliding resistance

D) can deal with movement of the suspension both vertically and in other directions

Correct Answer : can deal with movement of the suspension both vertically and in other directions

52 .

The size of engine cylinder is referred in terms of its

A) bore and stroke

B) bore and length

C) diameter and bore

D) displacement and efficiency

Correct Answer : bore and stroke

53 .

The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be

A) R

B) 2 R

C) 4R

D) 4 R²

Correct Answer : 4R

54 .

A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

A) makes the steering more responsive

B) improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion

C) reduces the amount of kick-back for large steering angles

D) allows the steering wheel to be turned by a greater amount when steering

Correct Answer : improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion

55 .

The function of a first compression ring (top ring) is that it

A) creates swirl

B) increases the combustion temperature

C) maintains a seal and prevents the fuel leakage

D) maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

Correct Answer : maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

56 .

The number of exhaust manifolds in a V-6 engine are

A) two

B) four

C) six

D) eight

Correct Answer : two

57 .

The driveshafts are connected to the differential and wheel hubs through universal joints because the universal joints

A) absorb the vibrations transferred from the surface of the road

B) absorb any difference in speed between the left and right wheels when the vehicle is turning

C) compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.

D) None of the above

Correct Answer : compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.

58 .

The braking control type traction control system (TCS) generally operates in the speed range of

A) less than 20 kmph

B) less than 40 kmph

C) less than 60 kmph

D) more than 60 kmph

Correct Answer : less than 40 kmph

59 .

The octane rating of petrol commerically available is

A) 100-110

B) 85-95

C) 95-100

D) 110-125

Correct Answer : 85-95

60 .

If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

A) too rich mixture

B) too lean mixture

C) stoichiometric mixture

D) most economical mixture

Correct Answer : too rich mixture

61 .

The crescent-shaped cavity on the piston head top surface is called as

A) snap ring

B) piston oil hole

C) valve clearance

D) valve recess

Correct Answer : valve recess

62 .

The two rows of cylinders in a 'V' type engine are generally arranged at

A) 130°

B) 90°

C) 60°

D) 45°

Correct Answer : 60°

63 .

A basic difference between the spark ignition engine and the Diesel engine is that the

A) air temperature ignites the fuel in the Diesel engine

B) Diesel engine compresses air alone instead of an air-fuel mixture

C) fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

D) All of the above

Correct Answer : All of the above

64 .

The timing belt is attached to the camshaft pulley and

A) distributor

B) timing belt drive pulley

C) alternator pulley

D) radiator fan pulley

Correct Answer : timing belt drive pulley

65 .

Caster is a

A) forward tilt of the kingpin

B) backward tilt of the kingpin

C) Either (A) or (B)

D) None of the above

Correct Answer : Either (A) or (B)

66 .

A front stabilizer bar is used to

A) control suspension movement and body roll

B) provide a softer ride

C) increase vehicle load-carrying capacity

D) All of the above

Correct Answer : control suspension movement and body roll

67 .

The cam shaft in an engine is always mounted

A) parallel to the crankshaft

B) inclined to the crankshaft

C) perpendicular to the crankshaft

D) None of the above

Correct Answer : parallel to the crankshaft

68 .

When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate

A) compression ratio

B) brake power

C) mean effective pressure

D) specific air consumption

Correct Answer : brake power

69 .

The best fuels for compression ignition engines are

A) aromatics

B) straight chain paraffins

C) branched chain paraffins

D) napthalenes

Correct Answer : napthalenes

70 .

A battery can be charged by

A) adding sulphuric acid

B) adding distilled water

C) applying voltage in the reverse direction to that of charging

D) applying a voltage in the same direction to that of charging

Correct Answer : applying voltage in the reverse direction to that of charging

71 .

The order in which effort applied to the steering wheel is transferred to the front wheel is

A) steering wheel - steering shaft - steering gearbox - steering knuckle - tie rod - front wheels

B) steering wheel - tie rod - steering gearbox - steering shaft - steering knuckle - front wheels

C) steering wheel - steering shaft - steering gearbox - tie rod - steering kunckle -front wheels

D) steering wheel - steering gearbox - steering shaft - tie rod - steering knuckle - front wheels

Correct Answer : steering wheel - steering shaft - steering gearbox - tie rod - steering kunckle -front wheels

72 .

When the front wheels of a vehicle are locked during braking, then

A) driver loses control over the steering, and the vehicle continues moving in its current direction

B) stopping distance becomes extremely long

C) rear tyres skid across the road surface, and the vehicle spins around

D) front tyres skid across the road surface, and the vehicle spins around

Correct Answer : driver loses control over the steering, and the vehicle continues moving in its current direction

73 .

An oil filter bypass valve opens when the

A) engine is cold

B) oil filter becomes clogged

C) engine overheats

D) engine runs at high speed

Correct Answer : oil filter becomes clogged

74 .

The main function of a resonator is that it

A) enhances intake efficiency

B) regulates the intake air flow rate

C) regulates the intake air temperature

D) reduces the intake air noise

Correct Answer : reduces the intake air noise

75 .

The most accurate ignition system of a spark ignition engine is

A) battery system

B) magneto system

C) electronic control unit system

D) magneto and electronic system

Correct Answer : electronic control unit system

76 .

Damper is also known as

A) spring

B) shock absorber

C) torsion bar

D) radius rod

Correct Answer : shock absorber

77 .

The main characteristics of a maintenance-free (MF) battery is that

A) recharging of a maintenance-free battery is neither required nor possible

B) a maintenance-free battery has a relatively short shelf life when compared with standard batteries

C) a maintenance-free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid

D) since it is sealed, the water in a maintenance-free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water

Correct Answer : since it is sealed, the water in a maintenance-free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water

78 .

The gear shift lever requires two separate motions to shift gears, and the first movement

A) selects the synchronizer

B) meshes the gears

C) operates the clutch

D) moves the synchronizer

Correct Answer : selects the synchronizer

79 .

Odometer is an instrument used for measurement of

A) power

B) distance

C) engine r.p.m.

D) fuel consumption

Correct Answer : distance

80 .

Two speed reverse gear arrangement is generally provided in case of

A) trucks

B) metadors

C) tractors

D) passenger cars

Correct Answer : tractors

81 .

Wheel base of a vehicle is the

A) extreme length of the vehicle

B) distance between the centres of the rear tyres

C) distance between the centres of the front and rear wheels

D) distance between the centres of the front tyres

Correct Answer : distance between the centres of the front and rear wheels

82 .

Which of the following oil is more viscous?

A) SAE 30

B) SAE 40

C) SAE 70

D) SAE 80

Correct Answer : SAE 80

83 .

In Diesel engines, the duration between the time of injection and the time of ignition is called

A) Spill cut-off

B) delay period

C) ignition period

D) injection period

Correct Answer : delay period

84 .

In a single dry plate clutch, torsional vibrations are absorbed by

A) central hub

B) clutch pedal

C) cushion springs

D) coil springs known as torsional springs

Correct Answer : coil springs known as torsional springs

85 .

The negative terminal post on the top of a battery is

A) smaller than the positive terminal post

B) larger than the positive terminal post

C) of the same size as the positive terminal post

D) None of the above

Correct Answer : smaller than the positive terminal post

86 .

Cushioning springs in clutch plate reduces

A) vehicle speed

B) torsional vibrations

C) jerky starts

D) None of the above

Correct Answer : jerky starts

87 .

In an engine, the temperature of the piston will be more at the

A) piston walls

B) crown of the piston

C) piston rings

D) skirt of the piston

Correct Answer : crown of the piston

88 .

In a four wheel drive (4WD), the number of gear boxes are

A) 1

B) 2

C) 3

D) 4

Correct Answer : 2

89 .

How many cells are used in a 12 volt car battery?

A) 2

B) 4

C) 6

D) 8

Correct Answer : 6

90 .

An over-inflated tyre will wear the tread most near the

A) centre

B) edges

C) corners

D) None of the above

Correct Answer : centre

91 .

In which of the following year was the first automobile built?

A) 1735

B) 1769

C) 1774

D) 1798

Correct Answer : 1769

Explanation : French engineer Nicholas Cugnot built the first road vehicle propelled by its own power.

92 .

Which of the following is a classification of IC Engine?

A) S.I Engines

B) Four-stroke engines

C) Otto cycle engine

D) All of the above

Correct Answer : Otto cycle engine

Explanation : On the Basis of the thermodynamic cycle, it is classified as:
Otto cycle engine, Diesel cycle engine, and Dual cycle engine

On the basis of the number of strokes per cycle, it is classified as:
Four-stroke cycle engine, Two-stroke cycle engine, Six-stroke cycle engine

On the basis of a number of methods of ignition, it is classified as:
Spark ignition engine and Compression ignition engine

93 .

What is the function of the alternator?

A) Auto-ignition

B) Voltage Regulator

C) Both (A) and (B)

D) Recharging the Battery

Correct Answer : Recharging the Battery

Explanation : The function of the alternator is:
i) Recharging the Battery
ii) Converting Mechanical Energy to Electrical Energy
iii) Powering Accessories

94 .

Tachometer in a vehicle measures

A) distance

B) speed

C) fuel consumption

D) engine r.p.m.

Correct Answer : engine r.p.m.

95 .

The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crank-case, is known as

A) scavenging

B) priming

C) cleaning

D) detonation

Correct Answer : scavenging

96 .

The ignition coil is used to

A) step up current

B) step up voltage

C) step down current

D) step down voltage

Correct Answer : step up voltage

97 .

One effect of detonation is

A) loss of power

B) delay in ignition

C) overheating of engine

D) overcooling of engine

Correct Answer : loss of power

98 .

The temperature indicating instrument in vehicles indicates the temperature of

A) lubricating oil

B) engine piston

C) engine cylinder

D) jacket cooling water

Correct Answer : jacket cooling water

99 .

The self ignition temperature of Diesel as compared to petrol is

A) same

B) higher

C) lower

D) depends on fuel quality

Correct Answer : lower

100 .

The purpose of a balancer shaft is to

A) increase inertia force of the rotating crankshaft

B) adjust the timing of the intake and exhaust valve openings

C) reduce vibrations caused by the crankshaft rotation

D) balance the timing in the movement of the two groups of pistons

Correct Answer : reduce vibrations caused by the crankshaft rotation

101 .

In aluminium cylinder blocks, the cylinder liners are made of

A) brass

B) cast iron

C) ceramic

D) aluminium

Correct Answer : cast iron

102 .

With the increase of battery temperature, the specific gravity of electrolyte

A) decreases

B) increases

C) reamains the same

D) None of the above

Correct Answer : decreases

103 .

The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as

A) scavenging

B) detonation

C) auto-ignition

D) supercharging

Correct Answer : supercharging

104 .

Incorrect steering axis inclination (S.A.I.) causes

A) tendency to assume toe-out orientation

B) generation of a braking effect at tight corners

C) poor recovery of the steering wheel after making a turn

D) the vehicle to pull to the side of lesser inclination

Correct Answer : poor recovery of the steering wheel after making a turn

105 .

In radial tyres

A) inner tubes are always used

B) all plies run parallel to one another and vertical to tyre bead

C) one ply layer runs diagonally one way and another layer runs diagonally the other way

D) None of the above

Correct Answer : all plies run parallel to one another and vertical to tyre bead

106 .

The torque available at the contact between driving wheels and road is known as

A) clutch effort

B) tractive effort

C) brake effort

D) None of the above

Correct Answer : tractive effort

107 .

A traction control system (TCS) in automobiles controls the

A) vibrations on the steering wheel

B) engine power during acceleration

C) stopping distance in case of emergency

D) torque that is transmitted by the tyres to the road surface

Correct Answer : torque that is transmitted by the tyres to the road surface

108 .

The oil pump is driven by the

A) camshaft

B) alternator shaft

C) crankshaft directly

D) crankshaft via drive belt

Correct Answer : crankshaft directly

109 .

The vehicle ride will be comfortable if

A) unsprung mass is kept minimum

B) vehicle mass is kept minimum

C) sprang mass is kept minimum

D) All of the above

Correct Answer : unsprung mass is kept minimum

110 .

The main function of intake manifold is that it

A) reduces intake noise

B) promotes the mixture of air and fuel

C) distributes intake air equally to the cylinders

D) cools the intake air to a suitable temperature

Correct Answer : distributes intake air equally to the cylinders

111 .

In a square type engine

A) geometrical shape is square

B) stroke length and cylinder bore are same

C) diameter and length of piston are same

D) two cylinders are placed horizontal and two vertical

Correct Answer : stroke length and cylinder bore are same

112 .

The most commonly used power plant in automobiles is

A) I.C. engine

B) battery

C) gas turbine

D) None of the above

Correct Answer : I.C. engine

113 .

The ignition in a spark ignition engine takes place when the piston is

A) leaving the T.D.C. position on its compression stroke

B) exactly at the T.D.C. position on its compression stroke

C) approaching the T.D.C position on its exhaust stroke

D) approaching the T.D.C. position on its compression stroke

Correct Answer : approaching the T.D.C. position on its compression stroke

114 .

The engine oil is stored in __________ when the engine is not running.

A) oil pump

B) oil pan

C) cylinder head

D) separate oil tank

Correct Answer : oil pan

115 .

The condition that results in large quantities of CO emission is

A) low temperature combustion

B) high temperature combustion

C) insufficient air during combustion

D) insufficient fuel during combustion

Correct Answer : insufficient air during combustion

116 .

The capacity of a battery is usually expressed in terms of

A) weight

B) volts

C) amperes

D) ampere-hours

Correct Answer : ampere-hours

117 .

The sequence order of events in a four-stroke engine is

A) suction - compression - power - exhaust

B) suction - power - compression - exhaust

C) suction - exhaust - power - compression

D) exhaust - compression - power - suction

Correct Answer : suction - compression - power - exhaust

118 .

In comparison with a radial tyre, one advantage of a bias-ply tyre is

A) longer life

B) lower rolling resistance

C) smoother ride at low speeds

D) None of the above

Correct Answer : smoother ride at low speeds

119 .

Which of the following is not a part of the chassis?

A) Seats

B) Wheels

C) Front axle

D) Steering system

Correct Answer : Seats

120 .

The stroke of an engine is the

A) volume of the cylinder

B) length of the connecting rod

C) internal diameter of the cylinder

D) distance between T.D.C. and B.D.C.

Correct Answer : distance between T.D.C. and B.D.C.

121 .

The function of a second ring is that it is a

A) compression ring and aids the top ring in sealing and cooling

B) cushion ring which prevents piston slap and knock

C) back up compression ring which will work in place of the top ring when it is broken

D) back up oil control ring which will work in place of the bottom ring when it is broken

Correct Answer : compression ring and aids the top ring in sealing and cooling

122 .

The rating of C.I. engine fuel (Diesel) is given by

A) octane number

B) performance number

C) cetane number

D) None of the above

Correct Answer : cetane number

123 .

The characteristic that is enhanced by the use of cylinder sleeves is

A) cooling efficiency

B) resistance to wear

C) lubrication performance

D) None of the above

Correct Answer : resistance to wear

124 .

Which part of the automobile tyre is subjected to greatest flexing action?

A) Tread

B) Bead

C) Shoulder

D) Side wall

Correct Answer : Side wall

125 .

The function of oil-control rings is that it

A) lubricates the cylinder wall by releasing oil from its hole

B) keeps the cylinder wall lubricated by holding oil in its channel

C) maintains a seal and prevents escape of burned gases and oil leakage

D) prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan

Correct Answer : prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan

126 .

The calorific value of Diesel is about

A) 45.5 MJ/kg

B) 42.5 MJ/kg

C) 38.5 MJ/kg

D) 36.5 MJ/kg

Correct Answer : 45.5 MJ/kg

127 .

The temperature at which tyre inflation pressure should be checked is

A) 20°C

B) 25°C

C) 35°C

D) ambient temperature

Correct Answer : ambient temperature

128 .

The negative plates of a lead acid battery has

A) spongy lead (Pb)

B) lead peroxide (PbO₂)

C) lead sulphate (PbSO₄)

D) sulphuric acid (H₂SO₄)

Correct Answer : spongy lead (Pb)

129 .

The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

A) warm up and lubricate the pump

B) pressurise the fuel system before the engine is started

C) enable the pump's fault-diagnosis function to operate

D) supply a large amount of fuel and thereby create a choke effect

Correct Answer : pressurise the fuel system before the engine is started

130 .

The lower cylindrical portion of the piston which improves piston cooling performance is called

A) piston crown

B) piston pin boss

C) piston skirt

D) connecting rod

Correct Answer : piston skirt

131 .

In which of the following conditions, the idle CO percentage should be measured with the vehicle?

A) Headlights are switched on.

B) Headlights and other electrical devices are switched off.

C) Headlights and other lights are switched off.

D) Headlights and other electrical devices are switched on.

Correct Answer : Headlights and other electrical devices are switched off.

132 .

The mechanical efficiency (η_m) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

A) I.P/B.P.

A)

B) B.P/I.P.

B)

C) B.P/F.P

C)

D) F.P./B.P.

D)

Correct Answer : B.P/I.P.

133 .

The most effective method of controlling S.I. engine exhaust emission is by

A) using catalytic converter

B) recirculating exhaust

C) using some additives in the fuel

D) None of the above

Correct Answer : using catalytic converter

134 .

The basic function of the suspension is to

A) automatically correct the effects of over steering

B) ensure that wheel alignment is not disturbed during driving

C) ensure that the steering wheel can deliver a suitable amount of steering force

D) absorb vibration and impact forces from the road surface

Correct Answer : absorb vibration and impact forces from the road surface

135 .

The power actually developed inside the engine cylinder is called as

A) brake power

B) indicated power

C) frictional power

D) None of the above

Correct Answer : indicated power

136 .

If clearance volume of I.C. engines is increased, the compression ratio will

A) decrease

B) increase

C) be doubled

D) remain constant

Correct Answer : decrease

137 .

In a four stroke engine for each crankshaft revolution, the camshaft revolves

A) one turn

B) two turns

C) one-half turn

D) four turns

Correct Answer : one-half turn

138 .

The valve tappet clearance is measured by

A) vernier caliper

B) engineering scale

C) feeler gauge

D) screw pitch gauge

Correct Answer : feeler gauge

139 .

An engine has a clearance volume of 100 cm3 and a swept volume of 800 cm3. The compression ratio is

A) 10:1

B) 9:1

C) 8:1

D) 7:1

Correct Answer : 9:1

140 .

If a tyre is designated as 175/65 R14 82 S, then the aspect ratio for the tyre is

A) 65

B) 82

C) 175

D) 193

Correct Answer : 65

141 .

The basic purpose of tyres is to

A) act as brake

B) substitute for springs

C) Both (A) and (B)

D) grip the road and provide good traction

Correct Answer : grip the road and provide good traction

142 .

The brake warning light warns the driver of

A) power-brake failure

B) air in the hydraulic system

C) water in the master cylinder

D) failure of the primary or secondary circuit of hydraulic system

Correct Answer : failure of the primary or secondary circuit of hydraulic system

143 .

The specific gravity of petrol is about

A) 0.75

B) 0.85

C) 0.95

D) 1.25

Correct Answer : 0.75

144 .

Which one of the following statement correctly describe the construction of a bevel-gear type differential?

A) The drive shafts are splined to the differential carrier.

B) The differential carrier houses differential pinion gears and side gears

C) The left side gear and the differential carrier rotate in constant unison.

D) The differential carrier houses differential pinion gears and side gears, each pinion gear meshes with a different side gear.

Correct Answer : The differential carrier houses differential pinion gears and side gears

145 .

The clutch is located between the transmission and the

A) rear axle

B) engine

C) differential

D) propeller shaft

Correct Answer : engine

146 .

Which of the following automobile has two/four doors?

A) Pickups

B) Convertible

C) Sedan

D) Special purpose vehicles

Correct Answer : Sedan

Explanation : 2 door and 4 door type vehicles are classified as sedans.

147 .

Which of the following is found in an automobile’s electrical system?

A) Battery

B) Alternators

C) Lighting systems

D) All of the above

Correct Answer : All of the above

Explanation : The key electrical components of an automobile are the battery, alternators, and lighting systems.

148 .

In which of the following year was Hindustan Motors Limited, Calcutta set up?

A) 1943

B) 1942

C) 1941

D) 1940

Correct Answer : 1943

Explanation : In India, two-vehicle businesses were founded in 1943 and 1944: Hindustan Motors Limited in Calcutta and Premier Automobiles Limited in Bombay.

149 .

Which of the following is necessary for the description of an automobile?

A) Model

B) Make

C) Capacity

D) All of the above

Correct Answer : All of the above

Explanation : Make, model, capacity are all essential information for describing an automobile.

150 .

Free pedal play in car clutches is about

A) 15 mm

B) 25 mm

C) 40mm

D) 60 mm

Correct Answer : 25 mm

151 .

The main function of a master cylinder is to

A) boost the force applied to brake pedal

B) adjust the extent of brake pedal free play

C) convert brake pedal force into hydraulic pressure

D) ensure that all the wheel brakes are supplied with the same amount of fluid pressure

Correct Answer : convert brake pedal force into hydraulic pressure

152 .

The device for smoothening out the power impulses from the engine is called

A) flywheel

B) clutch

C) differential

D) torque converter

Correct Answer : flywheel

153 .

The main purpose of an engine's air cleaner is that it

A) reduces the engine's air intake noise

B) controls the engine's air intake volume

C) prevents rain water from entering the engine

D) prevents dust and other foreign matter from entering the engine

Correct Answer : prevents dust and other foreign matter from entering the engine

154 .

The caster is called positive when the top of the king pin is inclined to the

A) left of the vehicle

B) right of the vehicle

C) rear of the vehicle

D) front of the vehicle

Correct Answer : rear of the vehicle

155 .

The exhaust gas from petrol engine contains

A) water vapours

B) petrol vapours

C) carbon monoxide

D) All of the above

Correct Answer : All of the above

156 .

In case of a Diesel car, the pressure at the end of compression is of the order of

A) 45 bar

B) 35 bar

C) 25 bar

D) 15 bar

Correct Answer : 45 bar

157 .

Clutch facings are usually attached to the plate by

A) steel rivets

B) brass rivets

C) steel screws

D) aluminium screws

Correct Answer : brass rivets

158 .

The connecting rod is attached to the piston by the

A) cap bolt

B) piston pin

C) rod cap

D) cap roller bearing

Correct Answer : piston pin

159 .

The effect of vapour locking on the brake performance is that the

A) brakes function more effectively

B) vapour locking has no effect on brake performance

C) brakes fail completely

D) brake operation is delayed after depression of the brake pedal

Correct Answer : brakes fail completely

160 .

In automobiles G.V.W. refers to

A) gross vehicle weight

B) gross vehicle width

C) gross vehicle wheel base

D) gross vehicle wheel track

Correct Answer : gross vehicle weight

161 .

The firing order for an in-line four cylinder I.C. engine is

A) 1-2-4-3

B) 1-2-3-4

C) 1-3-2-4

D) 1-3-4-2

Correct Answer : 1-3-4-2

162 .

The effect of having excess camber is

A) hard steering

B) too much traction

C) uneven tyre wear

D) excessive steering alignment torque

Correct Answer : uneven tyre wear

163 .

In a ventilated disc brake,

A) caliper is covered with cooling fins

B) disc contains many small holes for optimum cooling performance

C) a duct directs air towards the caliper for cooling while the vehicle is moving

D) disc contains radial vanes between its rubbing surfaces for optimum cooling performance

Correct Answer : disc contains radial vanes between its rubbing surfaces for optimum cooling performance

164 .

If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

A) 13:1

B) 10:1

C) 17:1

D) 15:1

Correct Answer : 10:1

165 .

If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called

A) pre-ignition

B) ignition

C) rumble

D) detonation

Correct Answer : pre-ignition

166 .

The co-efficient of rolling resistance for a truck weighing 63 500 N is 0.018. The rolling resistance to the truck is

A) 1.143 N

B) 11.43 N

C) 114.3 N

D) 1143 N

Correct Answer : 1143 N

167 .

Vulcanizing means

A) spraying with special paint

B) melting rubber while stirring it

C) heating rubber under pressure

D) None of the above

Correct Answer : heating rubber under pressure

168 .

The instrument used to check specific gravity of acid in a battery is

A) hygrometer

B) multimeter

C) hydrometer

D) anemometer

Correct Answer : hydrometer

169 .

When turning a corner,

A) the front wheels are toeing out

B) the front wheels are turning on different angles

C) the inside front wheels has a greater angle than the outside wheel

D) All of the above

Correct Answer : All of the above

170 .

The material generally used for cylinder sleeves is

A) ceremic

B) cast iron

C) aluminium

D) fibre reinforced plastic

Correct Answer : cast iron

171 .

The acid used in automobile battery is

A) sulphuric acid

B) nitric acid

C) hydrochloric acid

D) hydrofluoric acid

Correct Answer : sulphuric acid

172 .

The basic purpose of providing caster angle on wheels is to

A) prevent uneven tyre wear

B) maintain directional control

C) compensate for wear in the steering linkage

D) bring the road contact of the tyre under the point of load

Correct Answer : maintain directional control

173 .

The rolling resistance is because of the friction between the

A) wheel rim and tyre

B) wheel rim and road surface

C) tyre and the road surface

D) None of the above

Correct Answer : tyre and the road surface

174 .

When a gear box has four forward speeds and one reverse speed, it is said to be a

A) 3-speed gear box

B) 4-speed gear box

C) 5-speed gear box

D) 6-speed gear box

Correct Answer : 4-speed gear box

175 .

The Diesel engine works on

A) Otto cycle

B) Carnot cycle

C) Rankine cycle

D) Diesel cycle

Correct Answer : Diesel cycle

176 .

The starter motor is driven by

A) gear drive

B) chain drive

C) V-belt drive

D) flat belt drive

Correct Answer : gear drive

177 .

In a petrol engine, the high voltage for spark plug is in the order of

A) 1000 volts

B) 2000 volts

C) 11 kilovolts

D) 22 kilovolts

Correct Answer : 22 kilovolts

178 .

The correct flow of power through the drive train is

A) engine - clutch - countershaft - mainshaft - final driven gear - driveshafts - wheels

B) engine - mainshaft - countershaft - clutch - final driven gear - driveshafts - wheels

C) engine - clutch - mainshaft - countershaft - final driven gear - driveshafts - wheels

D) engine - driveshafts - clutch - mainshaft - countershaft - final driven gear - wheels

Correct Answer : engine - clutch - mainshaft - countershaft - final driven gear - driveshafts - wheels

179 .

The compression ratio for Diesel engines usually lies in the range of

A) 6-10

B) 10-15

C) 15-25

D) 25-40

Correct Answer : 15-25

180 .

The octane number of compressed natural gas (CNG) is

A) 90

B) 100

C) 110

D) 120

Correct Answer : 120

181 .

The piston compression rings are made of

A) steel

B) cast iron

C) bronze

D) aluminium

Correct Answer : cast iron

182 .

When the brake pedal free play is less than the specified value, then the

A) brake drags

B) brake fades

C) antilock braking system malfunctions

D) vapour locking occurs in the brake lines

Correct Answer : brake drags

183 .

In order to implement gear changes in the gear unit of an automatic transmission, a __________ is used.

A) synchronizer

B) hydraulic multi plate clutch

C) planetary gear

D) magnetic clutch

Correct Answer : hydraulic multi plate clutch

184 .

The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of

A) section width to section height

B) wheel diameter to section width

C) section height to section width

D) wheel diameter to section height

Correct Answer : section height to section width

185 .

Two advantages of using helical gears rather than spur gears in a transmission system are

A) strength and cost

B) noise level and economy

C) strength and less end thrust

D) noise level and strength

Correct Answer : noise level and strength

186 .

Damper in an automobile is used to

A) release the energy

B) absorb the energy

C) dissipate the energy

D) increase the energy

Correct Answer : dissipate the energy

187 .

The rigid suspension is beneficial when

A) it is desired to reduce the unsprung mass

B) it is desired to have more flexibility in design

C) it is desired to improve tyre-to-ground contact characteristics

D) large changes in load make it necessary to have a large suspension stroke

Correct Answer : large changes in load make it necessary to have a large suspension stroke

188 .

The combustion process in a Diesel engine is a

A) adiabatic process

B) constant pressure process

C) constant volume process

D) constant temperature process

Correct Answer : constant pressure process

189 .

The compression ratio of a petrol engine is nearly

A) 8:1

B) 15:1

C) 20:1

D) 25:1

Correct Answer : 8:1

190 .

The damper fluid leakage typically occur from

A) bottom of damper

B) coil spring mounting

C) upper damper mounting

D) clearance between inner and outer tubes of damper

Correct Answer : clearance between inner and outer tubes of damper

191 .

The tyre rotation is generally done at

A) 1000 km

B) 4000 km

C) 6000 km

D) 10000 km

Correct Answer : 10000 km

192 .

Two general types of tyres are

A) solid and tubeless

B) air and pneumatic

C) tube type and tubeless

D) split-rim and drop centre

Correct Answer : tube type and tubeless

193 .

The function of a proportioning control valve (PCV) in a brake system is to

A) reduce the brake fluid pressure when the brakes approach their lockup point

B) cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level.

C) ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation

D) cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level

Correct Answer : cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level.

194 .

The auto ignition in a spark ignition engine means

A) ignition induced by the passage of a spark

B) ignition of the charge before the passage of flame front

C) automatic ignition of the charge at the end of compression

D) ignition induced to supplement the process of normal combustion

Correct Answer : ignition of the charge before the passage of flame front

195 .

An under-inflated tyre will wear the tread most

A) near the edges

B) near the centre

C) in the cross direction

D) in the lateral direction

Correct Answer : near the edges

196 .

Highest useful compression ratio (HUCR) is the highest compression ratio at which the

A) engine can run

B) engine is most efficient

C) engine gives maximum output

D) fuel can be used in a test engine without knocking

Correct Answer : fuel can be used in a test engine without knocking

197 .

The function of a governor in automobiles is to

A) limit the power

B) limit the vehicle speed

C) maintain constant engine speed

D) maximise the fuel economy

Correct Answer : maintain constant engine speed

Explanation : The function of a governor in automobiles is to limit fuel to the engine to a maximum safe speed when unloaded and to maintain a relatively constant speed despite changes in loading.

198 .

In Diesel engines, during suction stroke, __________ is drawn in the cylinder.

A) only air

B) only fuel

C) air and fuel

D) None of the above

Correct Answer : only air

199 .

The crankshaft of a typical in-line four cylinder engine has __________ balance weights.

A) 4

B) 8

C) 12

D) 16

Correct Answer : 8

200 .

The formula for Iso-octane is

A) C₇H₁₇

B) C₈H₁₈

C) C₆H₁₈

D) C₇H₁₈

Correct Answer : C₈H₁₈

201 .

A petrol that detonates easily is called

A) blended fuel

B) unleaded petro

C) low octane petrol

D) high octane petrol

Correct Answer : low octane petrol

202 .

The condition that results in large quantities of HC emission is

A) incomplete combustion

B) high temperature combustion

C) low temperature combustion

D) high atmospheric temperature combustion

Correct Answer : incomplete combustion

203 .

The minimum parking brake force is generally __________ of gross vehicle mass (GVM).

A) 5%

B) 10%

C) 15%

D) 20%

Correct Answer : 20%

204 .

Bead wires are made of

A) zinc

B) steel

C) copper

D) aluminium

Correct Answer : steel

205 .

A petrol engine of a car develops 125 N-m torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is

A) 8.091 N-m

A)

B) 80.91 N-m

B)

C) 809.1 N-m

C)

D) 8091 N-m

D)

Correct Answer : 809.1 N-m

206 .

Which one of the following statements correctly describes the construction of a planetary gear type differential ?

A) The internal gear is fixed to the planetary gear.

B) One drive shaft is splined to the central gear and the other to the planetary gear.

C) The six planetary pinions rotate in constant mesh with the internal gears.

D) Each planetary pinion gear meshes with both the central gear and the internal gear.

Correct Answer : One drive shaft is splined to the central gear and the other to the planetary gear.

207 .

The engine oil viscosity is defined by __________ ratings.

A) gross vehicle weight (GVW)

B) automatic transmission fluid (ATF)

C) American petroleum institute (API)

D) society of automotive engineers (SAE)

Correct Answer : society of automotive engineers (SAE)

208 .

The advantage of the fuel injection system over the carburetor system is

A) improved emission

B) improved fuel efficiency

C) improved power output

D) All of the above

Correct Answer : All of the above

209 .

The component of the oil filter that prevents the passage of metal particles and sludge is

A) element

B) case

C) relief valve

D) check valve

Correct Answer : element

210 .

Which of the following type of load is supported by an automobile frame?

A) Sudden impacts from collisions

B) Torque from engine and transmission

C) Weight of the body, passengers and cargo loads

D) All of the above

Correct Answer : All of the above

Explanation : All the above-mentioned loads are supported by an automobile frame and is the basic function of an automobile frame.

211 .

Which of the following parts does not include an automobile chassis?

A) Brakes

B) Differential

C) Steering system

D) Shock absorbers

Correct Answer : Differential

Explanation : A ‘differential’ is a component of the transmission system.

212 .

Which of the following is defined as an upraised part on the hood which directs the airflow into the engine compartment?

A) Wings

B) Spoiler

C) Hood scoop

D) Hotpipe

Correct Answer : Hood scoop

Explanation : Hood scoop makes a channel of air to flow into the engine compartment.

213 .

Which of the following parameter is not necessary for the description of an automobile?

A) Type

B) Model

C) Colour

D) Capacity

Correct Answer : Colour

Explanation : Colour is not a necessary factor to describe an automobile.

214 .

The torque converter uses __________ to transfer torque.

A) air

B) gears

C) steel belt

D) automatic transmission fluid (ATF)

Correct Answer : automatic transmission fluid (ATF)

215 .

The two kinds of piston rings are

A) compression and oil-control rings

B) pressure and sealing rings

C) compression and sliding seal rings

D) oil scrapper and oil-control rings

Correct Answer : compression and oil-control rings

216 .

In a Diesel engine, the function of a fuel injector is to

A) mix the fuel and air

B) spray atomized fuel in the cylinder

C) ignite the air-fuel mixture

D) provide flame front for ignition

Correct Answer : spray atomized fuel in the cylinder

217 .

The function of positive crankcase ventilation (PCV) system is that it

A) mixes fuel with air

B) feeds blow-by gases to the exhaust manifold

C) returns blow-by gases from the crankcase to the intake system

D) promotes combustion by creating a swirling movement in the air-fuel mixture

Correct Answer : returns blow-by gases from the crankcase to the intake system

218 .

The firing order for an opposed four cylinder l.C. engine is

A) 1-2-3-4

B) 1-3-4-2

C) 1-3-2-4

D) 1-4-3-2

Correct Answer : 1-4-3-2

219 .

The maximum torque multiplication ratio in a torque converter is about

A) 2.5

B) 10

C) 25

D) 40

Correct Answer : 2.5

220 .

The composition of the electrolyte in a fully charged battery is that

A) the electrolyte is pure sulphuric acid

B) the electrolyte is pure distilled water

C) the electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight

D) the electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight

Correct Answer : the electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight

221 .

The heat transfer from coolant to air in the radiator of an automobile engine takes place by

A) radiation only

B) convection and radiation

C) convention only

D) conduction, convection and radiation

Correct Answer : convection and radiation

222 .

The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is

A) brake pedal - master cylinder - vacuum servo mechanism - brake lines - brake pads

B) brake pedal - vacuum servo mechanism - master cylinder - brake lines - brake pads

C) brake pedal - master cylinder - brake lines - vacuum servo mechanism - brake pads

D) brake pedal - brake lines - vacuum servo mechanism - master cylinder - brake pads

Correct Answer : brake pedal - vacuum servo mechanism - master cylinder - brake lines - brake pads

223 .

The basic purpose of a four wheel drive (4WD) system is that it

A) delivers improved cornering on dry road surfaces

B) eliminates the need of snow tyres, tyre chains, etc.

C) ensures that effective braking can be performed, even on slippery surfaces

D) ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces

Correct Answer : ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces

224 .

The information provided by the oxygen (O₂) sensor to the feedback control system is about the

A) air-fuel ratio

A)

B) air flow speed

B)

C) air temperature

C)

D) exhaust gas volume

D)

Correct Answer : air-fuel ratio

225 .

The operation of removing trapped air from the hydraulic braking system is known as

A) tapping

B) cleaning

C) bleeding

D) trapping

Correct Answer : bleeding

226 .

The battery is an electrochemical device, which means battery

A) has curved plates instead of flat plates

B) makes chemicals by mechanical means

C) uses chemical action to provide electricity

D) does not use an electrolyte

Correct Answer : uses chemical action to provide electricity

227 .

The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as

A) indicator diagram

B) axial force diagram

C) valve timing diagram

D) None of the above

Correct Answer : valve timing diagram

228 .

The difference between DOT 3 and DOT 4 brake fluids is

A) DOT 4 fluid has a higher boiling point than DOT 3 fluid

B) DOT 4 fluid has a lower boiling point than DOT 3 fluid

C) DOT 4 fluid is more resistant to freezing than DOT 3 fluid

D) DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life

Correct Answer : DOT 4 fluid has a higher boiling point than DOT 3 fluid

229 .

The aluminium alloy is used in cylinder blocks because

A) material cost is low

B) it is lighter and have good heat dissipation characteristics

C) it does not require any cylinder liners

D) the piston is also made of aluminium alloy

Correct Answer : it is lighter and have good heat dissipation characteristics

230 .

The compression ratio in petrol engine is kept less than in Diesel engine because

A) it makes petrol engines lighter

B) less compression ratio gives better performance

C) it is just customary to have less compression ratio in petrol engines

D) higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

Correct Answer : higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

231 .

The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called

A) toe-in

B) caster

C) camber

D) toe-out

Correct Answer : camber

232 .

The main function of the tread pattern on tyre is that

A) the crests between the tread grooves absorb road noise

B) the tread pattern protects the tyre's inner carcass from small stones and pieces of glass

C) in wet conditions, the tread grooves expel water that is drawn between the tyre and road surface

D) the tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating

Correct Answer : in wet conditions, the tread grooves expel water that is drawn between the tyre and road surface

233 .

When the piston is at T.D.C, the volume above the piston in the combustion chamber is the

A) exhaust volume

B) clearance volume

C) cylinder volume

D) None of the above

Correct Answer : clearance volume

234 .

In a hydraulic power steering system, the power steering pump is driven by a

A) belt-driven by crankshaft

B) belt-driven by camshaft

C) belt-driven by driveshaft

D) chain-driven by crankshaft

Correct Answer : belt-driven by crankshaft

235 .

The fuel that detonates easily, is

A) benzene

B) alcohol

C) iso-octane

D) n-heptane

Correct Answer : n-heptane

236 .

The correct way to rectify an imbalanced wheel is to

A) rotate the tyres

B) adjust the tyre pressure

C) adjust the damper spring tension

D) attach appropriate weights to the wheel at appropriate positions

Correct Answer : attach appropriate weights to the wheel at appropriate positions

237 .

The main cause for the change in engine oil viscosity is

A) humidity

B) vibration

C) temperature

D) contamination

Correct Answer : temperature

238 .

The forced-fed lubrication system means that the oil is delivered to the engine by

A) gravity

B) splashing action of the crankshaft

C) the pressure created by the oil pump

D) None of the above

Correct Answer : the pressure created by the oil pump

239 .

The problems caused by the wheel imbalance are

A) hard steering and hard ride

B) steering wheel vibrations and uneven tyre wear

C) poor acceleration and hard steering

D) poor acceleration and reduced fuel efficiency

Correct Answer : steering wheel vibrations and uneven tyre wear

240 .

The parking brake generally acts on

A) rear wheels

B) front wheels

C) propeller shaft

D) front and rear wheels

Correct Answer : rear wheels

241 .

The connecting rod lower end is connected to the relevant __________ of crankshaft.

A) big end

B) small end

C) crank arm

D) journal

Correct Answer : journal

242 .

The purpose of turning radius gauges is to measure the

A) contact areas of the tyres

B) free play of the steering wheel

C) turning radius of the left and right wheels

D) difference in the toe angles of the left and right wheels

Correct Answer : turning radius of the left and right wheels

243 .

The service brakes employed in cars are generally operated

A) hydraulically

B) pneumatically

C) mechanically

D) None of the above

Correct Answer : hydraulically

244 .

The three basic cylinder arrangements for automotive engines are

A) flat, radial, and V

B) in line, V, and opposed

C) V, double row, and opposed

D) in a row, in line, and opposed

Correct Answer : in line, V, and opposed

245 .

When the battery is half (50%) charged, the specific gravity of acid in a battery is usually

A) 0.74

B) 1.00

C) 1.12

D) 1.19

Correct Answer : 1.19

246 .

The specific gravity of Diesel is about

A) 0.65

B) 0.75

C) 0.85

D) 0.95

Correct Answer : 0.85

247 .

During braking, the brake shoe is moved outward to force the lining against the

A) anchor pin

B) brake drum

C) wheel rim or axle

D) wheel piston or cylinder

Correct Answer : brake drum

248 .

In bias ply tyres

A) all plies run parallel to one another

B) belts of steel mesh are used in the tyres

C) one ply layer runs diagonally one way and another layer runs diagonally the other way

D) All of the above

Correct Answer : one ply layer runs diagonally one way and another layer runs diagonally the other way

249 .

The boiling point of Diesel fuel is in the range of

A) 70°C to 100°C

B) 100°C to 120°C

C) 120°C to 180°C

D) 180°C to 360 °C

Correct Answer : 180°C to 360 °C

250 .

During suction stroke, the inside pressure of cylinder is

A) less than the atmospheric pressure

B) equal to the atmospheric pressure

C) more than the atmospheric pressure

D) None of the above

Correct Answer : less than the atmospheric pressure

251 .

In petrol engines, during suction stroke, __________ is drawn in the cylinder

A) only air

B) air and fuel

C) only fuel

D) None of the above

Correct Answer : air and fuel

252 .

The advantage of having a tandem master cylinder arrangement in automobiles is that it

A) boosts the brake fluid pressure to reduce the force required to depress the brake pedal

B) enhances safety by serving two independent lines in a divided-line brake circuit

C) enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss

D) supplies equal fluid pressure to each line of a divided-line brake circuit, thereby preventing the brakes from dragging on one side

Correct Answer : enhances safety by serving two independent lines in a divided-line brake circuit

253 .

The function of an oil control orifice is that it

A) turns oil into fine mist for spray lubrication

B) removes impurities from cylinder head lubricating oil

C) returns cylinder head lubricating oil to the oil pan at high speed

D) regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes

Correct Answer : regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes

254 .

The included angle is the sum of the

A) castor and S.A.I

B) camber and toe-in

C) camber and S.A.I.

D) camber and castor

Correct Answer : camber and S.A.I.

255 .

A three way catalytic converter

A) burns fuel vapaour gasses

B) recirculates exhaust gasses

C) reduces N2, H₂O, and CO₂ emission levels

D) removes CO, HC, and NO₂ from the exhaust gasses passing through it

Correct Answer : removes CO, HC, and NO₂ from the exhaust gasses passing through it

256 .

The lubrication oil flow in an engine is in the order as

A) oil strainer - oil pump - relief valve - oil filter - cylinder block - cylinder head - oil pan

B) oil strainer - oil filter - relief valve - oil pump - cylinder block - cylinder head - oil pan

C) oil strainer - oil pump - relief valve - oil filter - cylinder head - cylinder block - oil pan

D) oil pump - oil strainer - relief valve - oil filter - cylinder block - cylinder head - oil pan

Correct Answer : oil strainer - oil pump - relief valve - oil filter - cylinder block - cylinder head - oil pan

257 .

Which of the following parameter can be adjusted by modifying the tie-rod attachment length?

A) Toe

B) Caster

C) Camber

D) Steering gear ratio

Correct Answer : Toe

258 .

The main feature of MacPherson strut suspension is that

A) the unsprung mass in lighter

B) non-vertical external forces are supported by the suspension arms

C) the assembly is slightly more complicated in design

D) the vertical size of the suspension can be made more compact

Correct Answer : non-vertical external forces are supported by the suspension arms

259 .

A maintenance free battery

A) does not contain acid

B) does not contain water

C) has lead-calcium plate grid

D) has lead-antimony plate grid

Correct Answer : has lead-calcium plate grid

260 .

In a four cylinder in-line engine, the number of firing strokes in one revolution of the crank is

A) 1

B) 2

C) 3

D) 4

Correct Answer : 2

261 .

The engine oil level should be checked

A) while the engine is running

B) while the engine is running at high-idle speed

C) immediately after the ignition switch is turned off

D) a few minutes after the ignition switch is turned off

Correct Answer : a few minutes after the ignition switch is turned off

262 .

The function of a connecting rod is

A) to turn the flywheel

B) to drive the fuel pump

C) to drive the drive plate

D) to transmit motion of the piston to the crankshaft

Correct Answer : to transmit motion of the piston to the crankshaft

263 .

In a Diesel engine, the fuel is ignited by

A) the hot exhaust

B) an electric spark

C) the heat of compression

D) None of the above

Correct Answer : the heat of compression

264 .

In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as

A) relief valve

B) balancer

C) stop valve

D) release chamber

Correct Answer : relief valve

265 .

The Diesel engines as compared to petrol engines require

A) no flywheel

B) bigger flywheel

C) smaller flywheel

D) same size of flywheel

Correct Answer : bigger flywheel

266 .

The advantage of a tubeless tyre over tube type tyre is

A) slow air leakage

B) better fuel efficiency

C) less chances of running flat

D) All of the above

Correct Answer : All of the above

267 .

The seat belt tensioners are built in the

A) front seats

B) shoulder anchors

C) seat belt buckles

D) seat belt retractors

Correct Answer : seat belt retractors

268 .

Which of the following serves as a cooling and ventilation of engine lubricating oil?

A) piston

B) cam shaft

C) oil sump

D) crank case

Correct Answer : oil sump

Explanation : Oil sump or oil pan which is the bottom half of crankcase it is bolted or screwed to the lower flange of main casting.

269 .

Which of the following is attached to the bottom face of the cylinder block?

A) crankcase

B) piston

C) oil pan

D) cylinder liners

Correct Answer : crankcase

Explanation : Crankcase is joined to the bottom section of the cylinder block and serves as the engine’s base, holding the crankshaft and camshaft in appropriate bearings and providing an arm to support the engine on the frame.

270 .

Which of the following crankcase would result in saving weight also enable cheaper and quick replacement?

A) iron

B) aluminium

C) nickel

D) chromium

Correct Answer : aluminium

Explanation : Aluminium is lighter in weight and more readily available in the market, thus it can be quickly changed at a lesser cost.

271 .

Which of the following isn’t a cylinder block part?

A) carburetor

B) openings for valves

C) passages for the flow of cooling water

D) cylinder in which piston slides up and down

Correct Answer : passages for the flow of cooling water

Explanation : Carburettor isn’t a part of cylinder block it is used for a mixture of fuel and air and then allowed to the intake port.

272 .

Which of the following provides passages for the flow of cooling water?

A) piston

B) cylinder head

C) crankcase

D) cylinder block

Correct Answer : cylinder head

Explanation : Because the cylinder head only contains the combustion chamber, which is connected to the cooling water tubes to cool the engine or prevent it from overheating.

273 .

The purpose of a thermostat in an engine cooling system is to

A) indicate the coolant temperature

B) prevent the coolant from boiling

C) allow the engine to warm up quickly

D) pressurise the system to raise the boiling point

Correct Answer : allow the engine to warm up quickly

274 .

The reconditioning process used to give cylinder bore surfaces a cross-hatch pattern, is known as

A) honing

B) boring

C) shot peening

D) porous plating

Correct Answer : honing

275 .

The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is

A) 1.6694 N

B) 16.694 N

C) 166.94 N

D) 1669.4 N

Correct Answer : 1669.4 N

276 .

The petrol engine works on

A) Carnot cycle

B) Otto cycle

C) Diesel cycle

D) Rankine cycle

Correct Answer : Otto cycle

277 .

The function of a radiator fan in the cooling system is that

A) it draws heat out of the engine compartment

B) it cools the engine by blowing air onto the cylinder block

C) it blows air through the radiator when necessary

D) it is turned by wind force as the vehicle moves forward, and its rotation drives the water pump

Correct Answer : it blows air through the radiator when necessary

278 .

The starting system includes

A) a battery, a starter, and an ignition switch

B) a battery, a starter, and a distributor

C) a distributor, a starter, and an ignition switch

D) a battery, a distributor, and an ignition switch

Correct Answer : a battery, a starter, and an ignition switch

279 .

The characteristic that is enhanced by the honing of cylinder sleeves inner surface is

A) cooling efficiency

B) resistance to wear

C) lubrication performance

D) None of the above

Correct Answer : lubrication performance

280 .

Instead of valves, the ports are used in case of

A) V-6 engines

B) two-stroke I.C. engines

C) four stroke I.C. engines

D) None of the above

Correct Answer : two-stroke I.C. engines

281 .

The main function of an exhaust muffler is the

A) optimisation of exhaust efficiency

B) reduction of exhaust noise

C) reduction of the exhaust gas volume

D) reduction of nitrogen oxide in the exhaust gases

Correct Answer : reduction of exhaust noise

282 .

The most commonly used supplementary restraint system (SRS) component is

A) airbag

B) brake

C) steering

D) seat belt

Correct Answer : airbag

283 .

The cetane number of a Diesel fuel is a measure of

A) volatility

B) viscosity

C) ignition quality

D) delay peirod

Correct Answer : delay peirod

284 .

The natural gas is compressed in a CNG cylinder at a pressure of

A) 200 bar

B) 220 bar

C) 250 bar

D) 300 bar

Correct Answer : 200 bar

285 .

The air gap between the central electrode and ground (or side) electrode of a spark plug is around

A) 0.2 mm

B) 0.5 mm

C) 1 mm

D) 1.5 mm

Correct Answer : 1 mm

286 .

The cetane rating of Diesel fuel is in the order of

A) 25

B) 45

C) 70

D) 90

Correct Answer : 45

287 .

The valve overlap in four stroke petrol engines is approximately

A) 30°

B) 60°

C) 90°

D) 120°

Correct Answer : 30°

288 .

The component that connects the steering rack to the knuckles is

A) pivot

B) tie-rod

C) spline

D) sector gear

Correct Answer : tie-rod

289 .

Which of the following indicates a multigrade oil?

A) API SF

B) SAE 30

C) API 50

D) SAE 20 W-50

Correct Answer : SAE 20 W-50

290 .

The coefficient of friction for the clutch facing is approximately

A) 1.2

B) 0.8

C) 0.4

D) 0.1

Correct Answer : 0.4

291 .

The connecting rod connects the piston and the

A) crankshaft

B) camshaft

C) cylinder head

D) cylinder block

Correct Answer : crankshaft

292 .

The crankcase dilution means

A) dilution of fuel in the crankcase

B) dilution of oil by water in the crankcase

C) dilution of lubrication oil by fuel in the crankcase

D) dilution of mixture passing through crankcase in two-stroke engines

Correct Answer : dilution of lubrication oil by fuel in the crankcase

293 .

The component that is responsible for converting the rotation of the steering wheel into lateral motion is the

A) tie rod

B) steering gearbox

C) steering shaft

D) steering wheel

Correct Answer : steering gearbox

294 .

Valve overlap is the number of degrees of camshaft rotation during which

A) both valves are closed

B) both valves are open

C) Both (A) and (B)

D) None of the above

Correct Answer : both valves are open

295 .

The commonly used antifreeze solution in automobiles is

A) ethylene glycol

B) carbon disulphide

C) freon-12

D) ammonium chloride

Correct Answer : ethylene glycol

296 .

Which of the following bulb in a car will have the least wattage?

A) Stop light bulb

B) Head light bulb

C) Parking light bulb

D) Ignition warning bulb

Correct Answer : Ignition warning bulb

297 .

The basic part of the engine, to which the other engine parts are attached or assembled is the

A) oil pan

B) crankshaft

C) cylinder block

D) cylinder head

Correct Answer : cylinder block

298 .

Engine misfiring is likely to result from

A) incorrect fuel air mixture

B) spark plug gap too wide

C) spark plug gap too small

D) vapour lock in the fuel only

Correct Answer : spark plug gap too wide

299 .

The indicated power of a four-stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s))

A) P.L.A.N/2

A)

B) P.L.A.N

B)

C) P.L.A.N/4

C)

D) 2 x P.L.A.N

D)

Correct Answer : P.L.A.N/2

300 .

Which of the following car is a 'Convertible'?

A) Cadillac XTS

B) Mahindra Scorpio

C) Honda S2000

D) Volkswagen Golf GTI

Correct Answer : Honda S2000

Explanation : Honda S2000 is considered as a Convertible car.

301 .

What is an IC Engine?

A) the fuel is ignited and burned inside the engine

B) the fuel is ignited inside a combustion chamber

C) the fuel is burned inside a combustion chamber

D) None of the above

Correct Answer : the fuel is ignited and burned inside the engine

Explanation : An internal combustion engine (IC Engine) is one in which the fuel is ignited and burned inside the engine. It works on the concept that the charge is ignited under extreme pressure inside a combustion chamber.

302 .

Which of the following is not an arrangement of ic engine cylinders?

A) Circular

B) Radial

C) V type engine

D) Opposed cylinder engine

Correct Answer : Circular

Explanation : Circular arrangement is not used for ic engine cylinders.

303 .

Which of the following is a cylinder head type of an ic engine?

A) C head

B) U head

C) X head

D) F head

Correct Answer : F head

Explanation : Cylinders with F-type heads are very common.

304 .

Which of the following is a type of Gasket?

A) Single sheet rigid

B) Steel asbestos

C) Copper asbestos

D) All of the above

Correct Answer : All of the above

Explanation : All the three are various types of gaskets.

305 .

The temperature of the piston will be more at ______ in an automobile engine.

A) The piston rings

B) The crown of the piston

C) The piston walls

D) The skirt of the piston

Correct Answer : The crown of the piston

Explanation : The crown of the engine experiences the highest temperature.

306 .

Which of the following is defined as the escape of burned gases from the combustion chamber past the pistons and into the crankcase?

A) Gas loss

B) By pass

C) Blow by

D) Passed gas

Correct Answer : Blow by

Explanation : Blow by is the surging of burned gases from the combustion chamber into the crankcase.

307 .

Which of the following material is used to make connecting rod?

A) Forged steel

B) Tool steel

C) Cast iron

D) Mild steel

Correct Answer : Forged steel

Explanation : Connecting rod is made of forged steel.

308 .

Which of the following terms is used to express Ignition advance?

A) Crank angle

B) Time in milliseconds

C) Millimetres of piston travel before TDC

D) All of the above

Correct Answer : All of the above

Explanation : Ignition advance can be expressed in terms of any of the following.

Mechanical Engineering : Automobile Engineering MCQs with Answers