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Mechanical Engineering : IC Engines and Nuclear Power Plants - Quiz(MCQ)
1 .
The petrol engines are also known as __________ engines.
A)
spark ignition
B)
compression ignition
C)
Can Not Say
D)
None of the above

Correct Answer :   spark ignition

2 .
In order to eliminate knocking in compression ignition engines, there should be
A)
late auto-ignition
B)
low compression ratio
C)
short delay period
D)
high self ignition temperature of fuel

Correct Answer :   short delay period

3 .
If the speed of the engine is increased, the indicated power will
A)
decrease
B)
increase
C)
remain same
D)
None of the above

Correct Answer :   increase

4 .
The reference fuels for knock rating of spark ignition engines would include
A)
normal octane and aniline
B)
iso-octane and normal hexane
C)
iso-octane and alpha-methyl naphthalene
D)
normal heptane and iso-octane

Correct Answer :   normal heptane and iso-octane

5 .
The diesel engines are also known as __________ engines.
A)
spark ignition
B)
compression ignition
C)
Can Not Say
D)
None of the above

Correct Answer :   compression ignition

6 .
The specific fuel consumption per B.P. hour for a petrol engine is about
A)
0.25 kg
B)
0.3 kg
C)
0.35 kg
D)
0.45 kg

Correct Answer :   0.25 kg

7 .
The material most commonly used for sheilding is
A)
lead
B)
carbon
C)
concrete
D)
All of the above

Correct Answer :   concrete

8 .
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be
A)
25%
B)
50%
C)
70%
D)
100%

Correct Answer :   50%

9 .
In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
A)
end of suction stroke
B)
end of exhaust stroke
C)
beginning of exhaust stroke
D)
beginning of suction stroke

Correct Answer :   beginning of suction stroke

10 .
The predominent isotope of the naturally occuring element is
A)
Pu239
B)
U238
C)
U235
D)
Pu233

Correct Answer :   U238

11 .
A moderator generally used in nuclear power plants is
A)
concrete
B)
graphite
C)
heavy water
D)
graphite and concrete

Correct Answer :   graphite and concrete

12 .
The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called
A)
overall efficiency
B)
relative efficiency
C)
volumetric efficiency
D)
mechanical efficiency

Correct Answer :   volumetric efficiency

13 .
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to
A)
ensure that penetration is not high
B)
inject fuel at a high velocity to facilitate atomisation
C)
inject fuel in a chamber of high pressure at the end of compression stroke
D)
All of the above

Correct Answer :   All of the above

14 .
Reflector in nuclear power plants __________ neutron leakage.
A)
increases
B)
decreases
C)
have no effect on
D)
None of the above

Correct Answer :   decreases

15 .
Number of working strokes per min. for a two stroke cycle engine are __________ the speed of the engine in r.p.m.
A)
equal to
B)
twice
C)
one-half
D)
four-times

Correct Answer :   equal to

16 .
The exhaust valve in a four stroke cycle petrol engine
A)
may open and close anywhere
B)
opens at 50° before bottom dead centre and closes at 15° after top dead centre
C)
opens at bottom dead centre and closes at top dead centre
D)
opens at 50° after bottom dead centre and closes at 15° before top dead centre

Correct Answer :   opens at 50° before bottom dead centre and closes at 15° after top dead centre

17 .
Nuclear reactors are used
A)
to produce fissionable material
B)
to propel ships, submarines, aircrafts
C)
to produce heat for thermoelectric power
D)
All of the above

Correct Answer :   All of the above

18 .
A nuclear reactor is said to be critical when the neutron population in the reactor core is
A)
constant
B)
reduced to zero
C)
decreasing from the specified value
D)
rapidly increasing leading to the point of explosion

Correct Answer :   constant

19 .
The cetane number of diesel oil, generally available, is
A)
20 to 25
B)
25 to 30
C)
30 to 40
D)
40 to 55

Correct Answer :   40 to 55

20 .
The object of providing masked inlet valve in the air passage of compression ignition engines is to
A)
control air flow
B)
enhance flow rate
C)
induce primary swirl
D)
induce secondary turbulence

Correct Answer :   induce primary swirl

21 .
The power actually developed by the engine cylinder of an I.C. engine is known as
A)
actual power
B)
indicated power
C)
theoretical power
D)
None of the above

Correct Answer :   indicated power

22 .
The fuels in order of decreasing knock tendency for spark ignition engines are
A)
napthenes, aromatics, paraffins
B)
paraffins, napthenes, aromatics
C)
napthenes, paraffins, aromatics
D)
paraffins, aromatics, napthenes

Correct Answer :   paraffins, napthenes, aromatics

23 .
A petrol engine has compression ratio from
A)
6 to 10
B)
10 to 15
C)
15 to 25
D)
25 to 40

Correct Answer :   6 to 10

24 .
Plutonium (Pu239) is produced
A)
artificially
B)
by fission of Th232
C)
as basic raw material
D)
when U238 is irradiated by neutrons

Correct Answer :   when U238 is irradiated by neutrons

25 .
The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called
A)
volumetric efficiency
B)
mechanical efficiency
C)
indicated thermal efficiency
D)
overall efficiency

Correct Answer :   overall efficiency

26 .
If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbo-jet engine is
A)
V₀ / V₀+V₁
B)
V₁ / V₀+V₁
C)
2V₀ / V₀+V₁
D)
2V₁ / V₀+V₁

Correct Answer :   2Vâ‚€ / Vâ‚€+V₁

27 .
The nuclear radiators produced in a reactor which must be sheilded are
A)
electrons
B)
α, β and γ rays
C)
neutron and gamma rays
D)
None of the above

Correct Answer :   neutron and gamma rays

28 .
The higher combustion chamber wall temperature in compression ignition engines will __________ knocking tendency.
A)
reduce
B)
increase
C)
not effect
D)
None of the above

Correct Answer :   reduce

29 .
Theoretically, a four stroke cycle engine should develop __________ power as that of a two stroke cycle engine.
A)
same
B)
half
C)
double
D)
four times

Correct Answer :   half

30 .
Iso-octane (C8H18) has octane number of
A)
B)
50
C)
100
D)
120

Correct Answer :   100

31 .
The operation of forcing additional air under pressure into the engine cylinder is known as
A)
turbulence
B)
supercharging
C)
carburation
D)
delay period

Correct Answer :   supercharging

32 .
An ignition coil in the spark ignition engines supplies ____ voltage to the spark plug.
A)
high
B)
low
C)
Can Not Say
D)
None of the above

Correct Answer :   high

33 .
The brake power is always greater than indicated power.
A)
Agree
B)
Disagree
C)
Can Not Say
D)
None of the above

Correct Answer :   Disagree

34 .
A two stroke cycle engine gives __________ mechanical efficiency than a four stroke cycle engine.
A)
higher
B)
lower
C)
Can Not Say
D)
None of the above

Correct Answer :   higher

35 .
The theoretically correct mixture of air and petrol is
A)
25:1
B)
20:1
C)
15:1
D)
10:1

Correct Answer :   15:1

36 .
The delay period in compression ignition engines depends upon
A)
nature of the fuel mixture strength
B)
temperature and pressure in the cylinder at the time of injection
C)
relative velocity between the fuel injection and air turbulence pressure of residual gases
D)
All of the above

Correct Answer :   All of the above

37 .
Lubrication in I.C. engines dissipates the heat generated from the moving parts due to friction.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   True

38 .
The reflectivity of a reflector is defined as the fraction of neutrons entering the reflector which are returned to the core.
A)
Agree
B)
Disagree
C)
Can Not Say
D)
None of the above

Correct Answer :   Agree

39 .
A fuel of cetane number 40 has the same ignition quality as a mixture of
A)
40% petrol and 60% diesel
B)
40% diesel and 60% petrol
C)
40% cetane and 60% alpha methyl napthalene
D)
40% alpha methyl napthalene and 60% cetane

Correct Answer :   40% cetane and 60% alpha methyl napthalene

40 .
The two reference fuels used for cetane rating are
A)
cetane and iso-octane
B)
cetane and tetra ethyl lead
C)
cetane and normal heptane
D)
cetane and alpha-methyl naphthalene

Correct Answer :   cetane and alpha-methyl naphthalene

41 .
In petrol engines, the delay period is of the order of
A)
0.001 second
B)
0.002 second
C)
0.003 second
D)
0.004 second

Correct Answer :   0.002 second

42 .
In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.
A)
below
B)
equal to
C)
above
D)
None of the above

Correct Answer :   below

43 .
The pressure at the end of compression, in petrol engines, is approximately
A)
10 bar
B)
20 bar
C)
25 bar
D)
35 bar

Correct Answer :   10 bar

44 .
A diesel engine is __________ as compared to petrol engine, both running at rated load.
A)
less efficient
B)
equally efficient
C)
more efficient
D)
None of the above

Correct Answer :   more efficient

45 .
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
A)
inlet valve opening before top dead centre
B)
inlet valve closing after bottom dead centre
C)
inlet valve closing before bottom dead centre
D)
exhaust valve closing after top dead centre

Correct Answer :   inlet valve closing before bottom dead centre

46 .
The brake power of a diesel engine, keeping other parameters constant, can be increased by
A)
decreasing the pressure of intake air
B)
increasing the pressure of intake air
C)
decreasing the density of intake air
D)
increasing the temperature of intake air

Correct Answer :   increasing the pressure of intake air

47 .
The object of supercharging the engine is
A)
to reduce space occupied by the engine
B)
to reduce mass ofthe engine per brake power
C)
to increase the power output of an engine when greater power is required
D)
All of the above

Correct Answer :   All of the above

48 .
The expansion of fuel in a four stroke cycle diesel engine
A)
starts at 15° after top dead centre and ends at 30° before bottom dead centre
B)
starts at top dead centre and ends at 30° after top dead centre
C)
starts at 15° before top dead centre and ends at 30° after top dead centre
D)
None of the above

Correct Answer :   starts at 15° after top dead centre and ends at 30° before bottom dead centre

49 .
Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to
A)
cylinder walls being too hot
B)
overheated spark plug points
C)
red hot carbon deposits on cylinder walls
D)
Any one of the above

Correct Answer :   Any one of the above

50 .
In a four stroke cycle petrol engine, the charge is ignited at
A)
30° after top dead centre
B)
30° after bottom dead centre
C)
30° before top dead centre
D)
30° before bottom dead centre

Correct Answer :   30° before top dead centre

51 .
In a diesel engine, the duration between the time of injection and ignition, is known as
A)
burning period
B)
delay period
C)
period of ignition
D)
pre-ignition period

Correct Answer :   delay period

52 .
Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
A)
graphite
B)
heavy water
C)
carbon dioxide
D)
no moderator is needed

Correct Answer :   no moderator is needed

53 .
A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to
A)
slow down the speed of fast moving neutrons
B)
control the reaction
C)
reduce the temperature
D)
extract heat from nuclear reaction

Correct Answer :   slow down the speed of fast moving neutrons

54 .
Special reactors, called breeder reactors, supply a net gain of fissionable material.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   True

55 .
The ratio of the indicated thermal efficiency to the air standard efficiency is known as
A)
overall efficiency
B)
mechanical efficiency
C)
relative efficiency
D)
volumetric efficiency

Correct Answer :   relative efficiency

56 .
The ignition of the charge by some hot surface within the engine before the passage of spark is called
A)
detonation
B)
pre-ignition
C)
auto-ignition
D)
ignition delay

Correct Answer :   pre-ignition

57 .
The octane number of petrol, generally available, is
A)
20 to 40
B)
40 to 60
C)
60 to 80
D)
80 to 100

Correct Answer :   80 to 100

58 .
The normal heptane (C7H16) is given a rating of __________ octane number.
A)
B)
50
C)
100
D)
150

Correct Answer :   0

59 .
The air standard efficiency ofan I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
A)
1 - rγ - 1
B)
1 + rγ - 1
C)
1 - 1/rγ - 1
D)
None of the above

Correct Answer :   1 - 1/rγ - 1

60 .
The brake power is the power available
A)
at the crank shaft
B)
at the crank pin
C)
in the engine cylinder
D)
None of the above

Correct Answer :   at the crank shaft

61 .
In qualitative governing, the quantity of fuel is varied to suit the load on the engine and the total charge of air is altered.
A)
Correct
B)
Incorrect
C)
Can Not Say
D)
None of the above

Correct Answer :   Incorrect

62 .
The frictional power (F.P.) is given by
A)
F.P. = B.P./I.P.
B)
F.P. = I.P./B.P.
C)
F.P. = I.P. - B.P.
D)
F.P. = B.P. - I.P.

Correct Answer :   F.P. = I.P. - B.P.

63 .
The function of a distributor in a coil ignition system of I.C. engines is
A)
to time the spark
B)
to distribute spark
C)
to distribute power
D)
to distribute current

Correct Answer :   to time the spark

64 .
A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be
A)
corrossion resistant
B)
good thermal conductor
C)
stable under nuclear radiation
D)
All of the above

Correct Answer :   All of the above

65 .
A supercharged engine as compared to an ordinary engine
A)
is lighter
B)
requires smaller foundation
C)
consumes less lubricating oil
D)
All of the above

Correct Answer :   All of the above

66 .
A diesel engine has compression ratio from
A)
6 to 10
B)
10 to 15
C)
15 to 25
D)
25 to 40

Correct Answer :   15 to 25

67 .
A petrol engine, during suction stroke draws
A)
air only
B)
petrol only
C)
a mixture of petrol and air
D)
None of the above

Correct Answer :   a mixture of petrol and air

68 .
The specific fuel consumption per B.P. hour for a diesel engine is about
A)
0.2 kg
B)
0.25 kg
C)
0.3 kg
D)
0.35 kg

Correct Answer :   0.2 kg

69 .
The cylinder of a gas engine is made __________ than that of the petrol engine.
A)
smaller
B)
larger
C)
Can Not Say
D)
None of the above

Correct Answer :   larger

70 .
The thermal efficiency of a petrol engine is __________ as compared to diesel engine.
A)
same
B)
less
C)
more
D)
None of the above

Correct Answer :   less

71 .
The compression ignition engines are governed by
A)
qualitative governing
B)
hit and miss governing
C)
quantitative governing
D)
None of the above

Correct Answer :   qualitative governing

72 .
By higher octane number of spark ignition fuel, it is meant that the fuel has
A)
higher flash point
B)
higher heating value
C)
lower volatility
D)
longer ignition delay

Correct Answer :   longer ignition delay

73 .
A two stroke cycle engine gives __________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
A)
half
B)
same
C)
double
D)
four times

Correct Answer :   double

74 .
The ignition quality of diesel oil is expressed by
A)
cetane number
B)
calorific value
C)
octane number
D)
None of the above

Correct Answer :   cetane number

75 .
A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of
A)
75% petrol and 25% diesel
B)
75% iso-octane and 25% normal heptane
C)
75% diesel and 25% petrol
D)
75% normal heptane and 25% iso-octane

Correct Answer :   75% iso-octane and 25% normal heptane

76 .
In a four stroke cycle petrol engine, the expansion
A)
may start and end anywhere
B)
starts at top dead centre and ends at bottom dead centre
C)
starts at 30° after top dead centre and ends at 50° after bottom dead centre
D)
starts at 30° before top dead centre and ends at 50° before bottom dead centre

Correct Answer :   starts at 30° before top dead centre and ends at 50° before bottom dead centre

77 .
In a coil ignition system of petrol engines, a condenser is connected across the contact-breaker in order to
A)
prevent sparking across the gap between the points
B)
cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
C)
Both (A) and (B)
D)
None of the above

Correct Answer :   Both (A) and (B)

78 .
The spark ignition engines are governed by
A)
qualitative governing
B)
quantitative governing
C)
hit and miss governing
D)
None of the above

Correct Answer :   quantitative governing

79 .
If the temperature of intake air in internal combustion engine increases, then its efficiency will
A)
increase
B)
decrease
C)
remain same
D)
None of the above

Correct Answer :   decrease

80 .
The sensing element in the control system of nuclear reactors measure the __________ of the neutron flux in the reactor.
A)
density
B)
volume
C)
temperature
D)
None of the above

Correct Answer :   density

81 .
If petrol is used in a diesel engine, then
A)
efficiency will be low
B)
low power will be produced
C)
black smoke will be produced
D)
higher knocking will occur

Correct Answer :   higher knocking will occur

82 .
Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of
A)
pins
B)
plates
C)
pallets
D)
All of the above

Correct Answer :   All of the above

83 .
The turbine of the turbo-prop engine is __________ that of the turbo-jet engine.
A)
same as
B)
smaller than
C)
bigger than
D)
None of the above

Correct Answer :   bigger than

84 .
A higher compression ratio causes
A)
pre-ignition
B)
increase in detonation
C)
an acceleration in the rate of combustion
D)
Any one of the above

Correct Answer :   Any one of the above

85 .
Which of the following statement is correct ?
A)
Petrol engines work on Otto cycle.
B)
Compression ratio for petrol engines varies from 6 to 10.
C)
Higher compression ratio in diesel engines results in higher pressures.
D)
All of the above

Correct Answer :   All of the above

86 .
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is
A)
four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
B)
four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
C)
four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
D)
two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine

Correct Answer :   four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine

87 .
Which of the following fuel detonates readily ?
A)
Normal heptane
B)
Benzene
C)
Alcohol
D)
Iso-octane

Correct Answer :   Normal heptane

88 .
The combustion in compression ignition engines is
A)
homogeneous
B)
hetrogeneous
C)
Both (A) and (B)
D)
None of the above

Correct Answer :   hetrogeneous

89 .
Each fission of U235 produces on the average __________ fast neutrons as a product of reaction.
A)
246
B)
2460
C)
2.46
D)
24.6

Correct Answer :   2.46

90 .
Reactors for propulsion applications are designed for
A)
plutonium
B)
natura uranium
C)
enriched uranium
D)
any form of uranium

Correct Answer :   enriched uranium

91 .
In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will __________ the knocking tendency.
A)
increase
B)
decrease
C)
not effect
D)
None of the above

Correct Answer :   increase

92 .
Ordinary water is sometimes used as moderator when enriched uranium is used as a fuel in nuclear power plants.
A)
Yes
B)
No
C)
Can Not Say
D)
None of the above

Correct Answer :   Yes

93 .
The thermal efficiency of diesel engines is about
A)
15%
B)
30%
C)
50%
D)
70%

Correct Answer :   70%

94 .
The purpose of testing an internal combustion engine is
A)
to satisfy the customer regarding the performance of the engine
B)
to determine the information, which can not be obtained by calculations
C)
to conform the data used in design, the validity of which may be doubtful
D)
All of the above

Correct Answer :   All of the above

95 .
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
A)
jet area is automatically varied depending on the suction
B)
flow is produced due to the static head in the float chamber
C)
the diameter of the jet is constant and the discharge coefficient is invariant
D)
the flow from the main jet is diverted to the compensating jet with increase in speed

Correct Answer :   flow is produced due to the static head in the float chamber

96 .
The effective inhibitor of pre-ignition is
A)
lead
B)
alcohol
C)
water
D)
None of the above

Correct Answer :   water

97 .
In a four stroke cycle diesel engine, the compression
A)
may start and end anywhere
B)
starts at top dead centre and ends at 40° before bottom dead centre
C)
starts at 40° before top dead centre and ends at 40° after top dead centre
D)
starts at 40° after bottom dead centre and ends at 10° before top dead centre

Correct Answer :   starts at 40° after bottom dead centre and ends at 10° before top dead centre

98 .
In a four stroke cycle diesel engine, the inlet valve
A)
opens at 20° before top dead centre and closes at 40° after bottom dead centre
B)
may open and close anywhere
C)
opens at top dead centre and closes at bottom dead centre
D)
opens at 20° after top dead centre and closes at 20° before bottom dead centre

Correct Answer :   opens at 20° before top dead centre and closes at 40° after bottom dead centre

99 .
The loud pulsating noise heard within the cylinder of an internal combustion engine is known as
A)
detonation
B)
turbulence
C)
pre-ignition
D)
supercharging

Correct Answer :   detonation

100 .
The air-fuel ratio of the petrol engine is controlled by
A)
injector
B)
carburettor
C)
governor
D)
None of the above

Correct Answer :   carburettor

101 .
Which of the following statement is correct regarding the features of a Breeder reactor?
A)
It requires highly enriched fuel.
B)
It produces more fuel than it consumes.
C)
It requires liquid sodium metal as moderator.
D)
All of the above

Correct Answer :   All of the above

102 .
The volumetric efficiency ofa well designed engine may be
A)
30 to 40%
B)
40 to 60%
C)
60 to 70%
D)
75 to 90%

Correct Answer :   75 to 90%

103 .
If the compression ratio in I.C. engine increases, then its thermal efficiency will
A)
decrease
B)
increase
C)
remain same
D)
None of the above

Correct Answer :   increase

104 .
Which of the following does not relate to a compression ignition engine?
A)
Carburettor
B)
Governor
C)
Fuel pump
D)
Fuel injector

Correct Answer :   Carburettor

105 .
Which of the following statement is correct regarding petrol engines?
A)
A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure.
B)
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition.
C)
The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug.
D)
All of the above

Correct Answer :   The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug.

106 .
The colour of exhaust from diesel engine is generally
A)
bluish
B)
white
C)
black
D)
violent

Correct Answer :   black

107 .
Uranium has isotopes
A)
U₂₃₄
B)
U₂₃₅
C)
U₂₃₈
D)
All of the above

Correct Answer :   All of the above

108 .
Supercharging __________ the power developed by the engine.
A)
decreases
B)
increases
C)
has no effect on
D)
None of the above

Correct Answer :   increases

109 .
In compression ignition engines, swirl denotes a
A)
rotary motion of the gases in the chamber
B)
radial motion of the gases in the chamber
C)
haphazard motion of the gases in the chamber
D)
None of the above

Correct Answer :   rotary motion of the gases in the chamber

110 .
In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then __________ is employed.
A)
injector
B)
carburettor
C)
fuel pump
D)
None of the above

Correct Answer :   carburettor

111 .
A mixture containing 65% of iso-octane and 35% of normal heptane will have
A)
qetane number 35
B)
octane number 35
C)
octane number 65
D)
cetane number 65

Correct Answer :   octane number 65

112 .
The maximum propulsive efficiency of a turbo-jet engine is at a speed of
A)
1000 km/h
B)
2000 km/h
C)
2400 km/h
D)
3000 km/h

Correct Answer :   2400 km/h

113 .
Which of the following statement is wrong?
A)
In compression ignition engines, detonation occurs near the beginning of combustion.
B)
To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.
C)
In compression ignition engines, because of hetrogeneous mixture, the rate of pressure rise is comparatively lower.
D)
Since the fuel, in compression ignition engines, is injected at the end of compression stroke, therefore, there will be no pre-ignition.

Correct Answer :   To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.

114 .
Which of the following statement is correct regarding normal cetaine?
A)
It has long carbon chain structure.
B)
Its chemical name is normal-hexadecane.
C)
It is a standard fuel used for knock rating of diesel engines.
D)
All of the above

Correct Answer :   All of the above

115 .
The ignition quality of petrol is expressed by
A)
calorific value
B)
octane number
C)
cetane number
D)
All of the above

Correct Answer :   octane number

116 .
Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has
A)
low moderating efficiency
B)
high neutron scatter cross-section
C)
low neutron absorption cross-section
D)
high neutron absorption cross-section

Correct Answer :   low moderating efficiency

117 .
As compared to air standard cycle, in actual working, the effect of variation in specific heats is to
A)
reduce maximum pressure and maximum temperature
B)
increase maximum pressure and maximum temperature
C)
increase maximum pressure and decrease maximum temperature
D)
decrease maximum pressure and increase maximum temperature

Correct Answer :   reduce maximum pressure and maximum temperature

118 .
The fuel valve in a four stroke cycle diesel engine
A)
may open and close anywhere
B)
opens at top dead centre and closes at bottom dead centre
C)
opens at 15° before top dead centre and closes at 20° after top dead centre
D)
opens at 15° after top dead centre and closes at 20° before bottom dead centre

Correct Answer :   opens at 15° before top dead centre and closes at 20° after top dead centre

119 .
Diesel as compared to petrol is
A)
highly ignitable
B)
more difficult to ignite
C)
less difficult to ignite
D)
None of the above

Correct Answer :   more difficult to ignite

120 .
In petrol engines, advancing of the spark timing will __________ the knocking tendency.
A)
decrease
B)
not effect
C)
increase
D)
None of the above

Correct Answer :   increase

121 .
The knocking tendency in compression ignition engines for a given fuel will be
A)
dependent on other factors
B)
enhanced by increasing compression ratio
C)
Both (A) and (B)
D)
enhanced by decreasing compression ratio

Correct Answer :   enhanced by decreasing compression ratio

122 .
In a four stroke cycle engine, the sequence of operations is
A)
suction, compression, expansion and exhaust
B)
suction, expansion, compression and exhaust
C)
expansion, compression, suction and exhaust
D)
compression, expansion, suction and exhaust

Correct Answer :   suction, compression, expansion and exhaust

123 .
Spark plugs in automobiles generally have a gap between
A)
0.3 to 0.7 mm
B)
0.2 to 0.8 mm
C)
0.4 to 0.9 mm
D)
0.6 to 1.8 mm

Correct Answer :   0.6 to 1.8 mm

Explanation : Spark plugs in automobiles generally have a gap between 0.6 and 1.8 mm (0.024 and 0.071 in). The gap may require adjustment from the out-of-the-box gap.

124 .
Number of working strokes per min. for a four stroke cycle engine are __________ the speed of the engine in r.p.m.
A)
twice
B)
one-half
C)
equal to
D)
four-times

Correct Answer :   one-half

125 .
In a petrol engine, if diesel is used, then the engine will
A)
not run
B)
explode
C)
run at high speed
D)
run more efficiently

Correct Answer :   not run

126 .
The running cost of a petrol engine is __________ than that of a diesel engine.
A)
lower
B)
higher
C)
Can Not Say
D)
None of the above

Correct Answer :   higher

127 .
The knocking tendency in spark ignition engines may be decreased by
A)
controlling the air-fuel mixture
B)
controlling the ignition timing
C)
reducing the compression ratio
D)
controlling the exhaust temperature

Correct Answer :   reducing the compression ratio

128 .
The air standard efficiency of an I.C. engine depends on
A)
fuel used
B)
speed of engine
C)
compression ratio
D)
None of the above

Correct Answer :   compression ratio

129 .
A diesel engine has
A)
four valves
B)
three valves
C)
two valves
D)
one valve

Correct Answer :   three valves

130 .
A carburettor is used to supply
A)
petrol and air
B)
air and diesel
C)
petrol and lubricating oil
D)
petrol, air and lubricating oil

Correct Answer :   petrol and air

131 .
The increase of cooling water temperature in petrol engine will __________ the knocking tendency.
A)
increase
B)
decrease
C)
not effect
D)
None of the above

Correct Answer :   increase

132 .
The self ignition temperature of petrol is __________ as compared to diesel oil.
A)
lower
B)
same
C)
higher
D)
None of the above

Correct Answer :   higher

133 .
The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke.
A)
equal to
B)
above
C)
below
D)
None of the above

Correct Answer :   above

134 .
U₂₃₃ is produced
A)
artificially
B)
as basic raw material
C)
by fission of U₂₃₈
D)
when thorium is irradiated by neutrons

Correct Answer :   when thorium is irradiated by neutrons

135 .
The pressure at the end of compression, in diesel engines, is approximately
A)
10 bar
B)
20 bar
C)
25 bar
D)
35 bar

Correct Answer :   35 bar

136 .
The energy released during the fission of one atom of Uranium - 235 in million electron volts is about
A)
100
B)
200
C)
300
D)
400

Correct Answer :   200

137 .
A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking.
A)
Yes
B)
No
C)
Can Not Say
D)
None of the above

Correct Answer :   Yes

138 .
Which one of the following engines will have heavier flywheel than the remaining ones?
A)
30 kW two-stroke diesel engine running at 750 r.p.m.
B)
30 kW four-stroke diesel engine running at 750 r.p.m.
C)
30 kW four-stroke petrol engine running at 1500 r.p.m.
D)
30 kW two-stroke petrol engine running at 1500 r.p.m.

Correct Answer :   30 kW four-stroke petrol engine running at 1500 r.p.m.

139 .
A fission chain reaction in uranium can be developed
A)
by increasing the contents of U₂₃₅
B)
by slowing down fast neutrons so that U₂₃₅ fission continues by slow neutron
C)
Both (A) and (B)
D)
None of the above

Correct Answer :   Both (A) and (B)

140 .
Thermal efficiency of a two stroke cycle engine is __________ a four stroke cycle engine.
A)
equal to
B)
less than
C)
greater than
D)
None of the above

Correct Answer :   less than

141 .
The firing order in an I.C. engine depends upon
A)
number of cylinders
B)
design of crankshaft
C)
arrangement of the cylinders
D)
All of the above

Correct Answer :   All of the above

142 .
A power plant giving least running cost of production of electrical power is
A)
nuclear power plant
B)
steam power plant
C)
gas turbine power plant
D)
hydro electric power plant

Correct Answer :   nuclear power plant

143 .
The thermal efficiency of petrol and gas engines is about
A)
15%
B)
30%
C)
50%
D)
70%

Correct Answer :   30%

144 .
The advancing of spark timing in spark ignition engines will __________ knocking tendency.
A)
reduce
B)
not effect
C)
increase
D)
None of the above

Correct Answer :   increase

145 .
The increase of efficiency of a compression ignition engine, as the load decreases, is due to
A)
quantitative governing
B)
hit and miss governing
C)
qualitative governing
D)
higher maximum temperature

Correct Answer :   qualitative governing

146 .
The knocking in spark ignition engines can be reduced by
A)
retarding the spark
B)
increasing the engine speed
C)
Both (A) and (B)
D)
None of the above

Correct Answer :   Both (A) and (B)

147 .
The ratio of the brake power to the indicated power is called
A)
overall efficiency
B)
volumetric efficiency
C)
indicated thermal efficiency
D)
mechanical efficiency

Correct Answer :   mechanical efficiency

148 .
A turbo-jet does not require a turbine to drive the compressor.
A)
True
B)
False
C)
Can Not Say
D)
None of the above

Correct Answer :   False

149 .
Morse test is used to determine the I.P. of a
A)
multi-cylinder engine
B)
four stroke engine
C)
single cylinder diesel engine
D)
single cylinder petrol engine

Correct Answer :   multi-cylinder engine

150 .
The cetane (C₁₆H₃₄) which is a straight chain paraffin is assigned a cetane number of
A)
B)
50
C)
100
D)
120

Correct Answer :   100

151 .
The first nuclear power plant in India was located at
A)
Kota
B)
Tarapur
C)
Bareilly
D)
None of the above

Correct Answer :   Tarapur

152 .
In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as
A)
detonation
B)
supercharging
C)
scavenging
D)
polymerisation

Correct Answer :   scavenging

153 .
The probability of knocking in diesel engines is increased by
A)
low volatility
B)
higher viscosity
C)
high self ignition temperature
D)
All of the above

Correct Answer :   All of the above

154 .
A diesel engine, during suction stroke, draws
A)
air only
B)
diesel only
C)
a mixture of diesel and air
D)
None of the above

Correct Answer :   air only

155 .
Anti-knock for compression ignition engines is
A)
napthene
B)
hexadecane
C)
amyl nitrate
D)
tetra ethyl lead

Correct Answer :   amyl nitrate

156 .
Supercharging is the process of supplying the intake air to the engine cylinder at a density __________ the density of the surrounding atmosphere.
A)
less than
B)
greater than
C)
equal to
D)
None of the above

Correct Answer :   greater than

157 .
In a four stroke cycle petrol engine, the compression
A)
starts at bottom dead centre and ends at top dead centre
B)
starts at 40° after bottom dead centre and ends at 30° before top dead centre
C)
starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
D)
None of the above

Correct Answer :   starts at 40° after bottom dead centre and ends at 30° before top dead centre

158 .
The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of
A)
Morse test
B)
motoring test
C)
prony brake test
D)
heat balance test

Correct Answer :   Morse test

159 .
Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of
A)
B)
50
C)
100
D)
120

Correct Answer :   0

160 .
In a petrol engine, the mixture has the lowest pressure at the
A)
beginning of suction stroke
B)
end of compression stroke
C)
end of suction stroke
D)
None of the above

Correct Answer :   end of suction stroke

161 .
The reflectivity depends upon
A)
energy of neutrons
B)
geometry of the reflector
C)
properties of the reflector
D)
All of the above

Correct Answer :   All of the above

162 .
Which of the following does not relate to a spark ignition engine?
A)
Spar kplug
B)
Ignition coil
C)
Fuel injector
D)
Carburettor

Correct Answer :   Fuel injector

163 .
The increase in intake temperature of internal combustion engines will __________ efficiency.
A)
increase
B)
decrease
C)
have no effect on
D)
None of the above

Correct Answer :   decrease

164 .
A gas engine has a swept volume of 300 cm³ and clearance volume of 25 cm³. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is
A)
248 cm³
B)
252 cm³
C)
264 cm³
D)
286 cm³

Correct Answer :   264 cm³

165 .
In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
A)
low density
B)
low temperature
C)
long ignition delay
D)
All of the above

Correct Answer :   All of the above

166 .
Morse test can be conducted for
A)
petrol engines
B)
multi-cylinder engines
C)
diesel engines
D)
All of the above

Correct Answer :   multi-cylinder engines

167 .
The injection pressure in a diesel engine is about
A)
500 bar
B)
150 bar
C)
100 bar
D)
10 bar

Correct Answer :   100 bar

168 .
The basic requirement of a good combustion chamber is
A)
minimum turbulence
B)
low compression ratio
C)
low volumetric efficiency
D)
high thermal efficiency and power output

Correct Answer :   high thermal efficiency and power output

169 .
In a four stroke cycle petrol engine, the charge is compressed when both the valves (i.e. inlet valve and exit valve) are closed,
A)
Agree
B)
Disagree
C)
Can Not Say
D)
None of the above

Correct Answer :   Agree

170 .
High speed compression engines operate on
A)
Otto cycle
B)
Diesel cycle
C)
Dual-combustion cycle
D)
All of the above

Correct Answer :   Dual-combustion cycle

171 .
The nuclear power station at Tarapur has the reactor of the __________ type.
A)
gas cooled
B)
boiling water
C)
pressurized water
D)
liquid metal cooled

Correct Answer :   boiling water

172 .
The secondary fuel used in nuclear power plants is
A)
U₂₃₃ and Pu₂₃₉
B)
U₂₃₅ and Th₂₃₂
C)
U₂₃₅ and Pu₂₃₈
D)
U₂₃₃ and Pu₂₃₈

Correct Answer :   U₂₃₃ and Pu₂₃₉

173 .
In a four stroke cycle petrol engine, the inlet valve
A)
opens at top dead centre and closes at bottom dead centre
B)
opens at 20° before top dead centre and closes at 40° after bottom dead centre
C)
opens at 20° after top dead centre and closes at 20° before bottom dead centre id) may open or close anywhere
D)
None of the above

Correct Answer :   opens at 20° before top dead centre and closes at 40° after bottom dead centre

174 .
A moderator
A)
absorbs neutrons
B)
accelerates neutrons
C)
Both (A) and (B)
D)
does not absorb neutrons

Correct Answer :   does not absorb neutrons

175 .
The inlet valve of a four stroke cycle internal combustion engine remains open for
A)
130°
B)
180°
C)
230°
D)
270°

Correct Answer :   230°

176 .
The thermodynamic cycle on which the petrol engine works, is
A)
Joule cycle
B)
Stirling cycle
C)
Otto cycle
D)
Rankine cycle

Correct Answer :   Otto cycle

177 .
In a four stroke cycle diesel engine, the exhaust valve
A)
opens at 30° before bottom dead cnetre and closes at 10° after top dead centre
B)
may open and close anywhere
C)
opens at bottom dead centre and closes at top dead centre
D)
opens at 30° after bottom dead centre and closes at 10° before top dead centre

Correct Answer :   opens at 30° before bottom dead cnetre and closes at 10° after top dead centre

178 .
The correct mixture strength (by weight) for petrol is about
A)
0
B)
14.6:1
C)
18.5:1
D)
20.4:1

Correct Answer :   14.6:1

179 .
The control rods in the control system of nuclear reactors are used to
A)
control temperature
B)
control fuel consumption
C)
Both (A) and (B)
D)
absorb excess neutrons

Correct Answer :   absorb excess neutrons

180 .
The working pressure and temperature inside the cylinder of an internal combustion engine is __________ as compared to a steam engine.
A)
low
B)
very low
C)
high
D)
very high

Correct Answer :   very high

181 .
The scavenging efficiency of a four stroke cycle diesel engine is
A)
below 50%
B)
between 50 and 85%
C)
between 85 and 95%
D)
between 95 and 100%

Correct Answer :   between 95 and 100%

182 .
The voltage required to produce a spark across the gap, between the sparking points is
A)
2000 to 4000 volts
B)
4000 to 6000 volts
C)
6000 to 10 000 volts
D)
10 000 to 12 000 volts

Correct Answer :   6000 to 10 000 volts

183 .
During idling, a petrol engine requires __________ mixture.
A)
lean
B)
rich
C)
chemically
D)
None of the above

Correct Answer :   rich

184 .
In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a
A)
spark plug
B)
fuel pump
C)
fuel injector
D)
None of the above

Correct Answer :   spark plug

185 .
Which of the following fuel has little tendency towards detonation?
A)
Benzene
B)
Iso-octane
C)
Alcohol
D)
Normal heptane

Correct Answer :   Iso-octane

186 .
Stoichiometric ratio is
A)
chemically correct air-fuel ratio by weight
B)
actual air-fuel ratio for maximum efficiency
C)
Both (A) and (B)
D)
chemically correct air-fuel ratio by volume

Correct Answer :   chemically correct air-fuel ratio by volume

187 .
In natural uranium, the constituents of three naturally occuring isotopes are
A)
U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%
B)
U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%
C)
U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%
D)
U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%

Correct Answer :   U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%

188 .
A nuclear power plant differs from a conventional steam power station only in the steam generating part.
A)
Agree
B)
Disagree
C)
Can Not Say
D)
None of the above

Correct Answer :   Agree

189 .
In a four stroke engine, the working cycle is completed in
A)
one revolution of the crankshaft
B)
two revolutions of the crankshaft
C)
three revolutions of the crankshaft
D)
four revolutions of the crankshaft

Correct Answer :   two revolutions of the crankshaft

190 .
Enriched uranium may contain fissionable contents from
A)
1 to 99%
B)
1 to 80%
C)
10 to 50%
D)
1 to 40%

Correct Answer :   1 to 99%