Mechanical Engineering - Steam Boilers and Engines Quiz (or) MCQ

1 .

In a uniflow engine

A)

Steam enters at one end and exhausts at the centre

B)

Steam enters and exhausts through the same port

C)

Steam enters at the centre and exhausts at the other end

D)

None of the above

Correct Answer : Steam enters at one end and exhausts at the centre

2 .

Which of the following statement is correct ?

A)

The compound steam engines are generally non-condensing steam engines.

B)

The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure.

C)

A horizontal steam engine requires less floor area than a vertical steam engine.

D)

All of the above

Correct Answer : The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure.

3 .

Which of the following compound steam engine requires a smaller flywheel ?

A)

Woolf type

B)

Receiver type

C)

Tandem type

D)

All of the above

Correct Answer : Receiver type

4 .

Cut-off governing of steam engines is a method of controlling the engine output by varying

A)

pressure of intake steam

B)

temperature of intake steam

C)

volume of intake steam

D)

All of the above

Correct Answer : volume of intake steam

5 .

In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

A)

78%

B)

74%

C)

71%

D)

63%

Correct Answer :

6 .

Which of the following statement is correct ?

A)

Fire tube boilers are internally fired.

B)

Lancashire boiler is a fire tube boiler.

C)

Babcock and Wilcox boiler is a water tube boiler.

D)

All of the above

Correct Answer : All of the above

7 .

A safety valve mainly used with locomotive and marine boilers is

A)

spring loaded safety valve

B)

lever safety valve

C)

dead weight safety valve

D)

high steam and low water safety valve

Correct Answer : spring loaded safety valve

8 .

Which of the following boiler is best suited to meet the fluctuating demand of steam ?

A)

Cornish boiler

B)

Lancashire boiler

C)

Locomotive boiler

D)

Babcock and Wilcox boiler

Correct Answer : Locomotive boiler

9 .

Expansion ratio is the ratio of

A)

volume at cut-off to the swept volume

B)

swept volume to the volume at cut-off

C)

swept volume to the clearance volume

D)

clearance volume to the swept volume

Correct Answer : swept volume to the volume at cut-off

10 .

For the same diameter and thickness of tube, a water tube boiler has __________ heating surface as compared to fire tube boiler.

A)

less

B)

equal

C)

more

D)

None of the above

Correct Answer : more

11 .

Throttle governing of steam engines is a method of controlling the engine output by varying

A)

volume of intake steam

B)

temperature of intake steam

C)

Both (A) and (B)

D)

pressure of intake steam

Correct Answer : pressure of intake steam

12 .

In cross compounding, the cylinders are arranged

A)

side by side and each cylinder has separate piston, connecting rod and crank

B)

side by side and each cylinder has common piston, connecting rod and crank

C)

at 90Â° and each cylinder has separate piston, connecting rod and crank

D)

at 90Â° and each cylinder has common piston, connecting rod and crank

Correct Answer : side by side and each cylinder has separate piston, connecting rod and crank

13 .

The high steam and low water safety valve is used to blow off steam when the

A)

water level in the boiler becomes too low

B)

steam pressure exceeds the working pressure

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Both (A) and (B)

14 .

A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

A)

fusible plug

B)

stop valve

C)

superheater

D)

blow off cock

Correct Answer : stop valve

15 .

A single ended Scotch marine steam boiler may have one to four furnaces which enter from front end of the boiler.

A)

Correct

B)

Incorrect

C)

Can Not Say

D)

None of the above

Correct Answer : Correct

16 .

A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called

A)

Woolf type compound engine

B)

receiver type compound engine

C)

Tandem type compound engine

D)

None of the above

Correct Answer : Tandem type compound engine

17 .

Besides mean effective pressure, the data required to determine the indicated power of an engine include

A)

specific fuel consumption, speed of rotation and torque

B)

piston diameter, length of stroke and calorific value of fuel

C)

piston diameter, specific fuel consumption and Calorific value of fuel

D)

piston diameter, length of stroke and speed of rotation

Correct Answer : piston diameter, length of stroke and speed of rotation

18 .

The efficiency of the plant __________ with the mechanical draught.

A)

increases

B)

decreases

C)

remains constant

D)

None of the above

Correct Answer : increases

19 .

The internal flue tubes of a Lancashire boiler are reduced in diameter at the back to provide access to the lower part of the boiler.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

20 .

A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as

A)

injector

B)

air preheater

C)

economiser

D)

superheater

Correct Answer : air preheater

21 .

Steam engines are called external combustion engines.

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

22 .

The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks

A)

0Â° to each other

B)

90Â° to each other

C)

180Â° to each other

D)

None of the above

Correct Answer : 180Â° to each other

23 .

The clearance in the engine cylinder has no effect on the steam consumption.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : False

24 .

Which of the following boiler works on a forced circulation of water?

A)

Benson boiler

B)

Loeffler boiler

C)

La-mont boiler

D)

All of the above

Correct Answer : All of the above

25 .

In a single acting steam engine

A)

the steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft

B)

the steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft

C)

the steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft

D)

the steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft.

Correct Answer : the steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft

26 .

The cylindrical shell of a Lancashire boiler has diameter from

A)

1 to 2 m

B)

1.25 to 2.25 m

C)

1.5 to 2.5 m

D)

1.75 to 2.75 m

Correct Answer : 1.75 to 2.75 m

27 .

The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

A)

feedpump

B)

injector

C)

pressure gauge

D)

feed check valve

Correct Answer : feedpump

28 .

The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

A)

power of a boiler

B)

factor of evaporation

C)

boiler efficiency

D)

equivalent evaporation

Correct Answer : boiler efficiency

29 .

Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?

A)

Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes.

B)

Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube.

C)

Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler.

D)

Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler.

Correct Answer : Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes.

30 .

By compounding the expansion of steam in two or more cylinders, the ratio of expansion

A)

increases

B)

decreases

C)

does not change

D)

None of the above

Correct Answer : decreases

31 .

The water tubes in a simple vertical boiler are

A)

vertical

B)

inclined

C)

horizontal

D)

None of the above

Correct Answer : inclined

32 .

A single acting steam engine produces __________ power than that of double acting steam engine.

A)

half

B)

equal

C)

double

D)

four times

Correct Answer : half

33 .

The rate of steam produced in Benson boiler is

A)

100 tonnes/h

B)

135 tonnes/h

C)

175 tonnes/h

D)

250 tonnes/h

Correct Answer : 135 tonnes/h

34 .

The function of a flywheel is

A)

to keep the engine speed uniform at all load conditions

B)

to convert reciprocating motion of the piston into rotary motion.

C)

to prevent fluctuation of speed

D)

to convert rotary motion of the crankshaft into to and fro motion of the valve rod

Correct Answer : to prevent fluctuation of speed

35 .

The pressure of steam in the engine cylinder at the beginning of the stroke is __________ the boiler pressure.

A)

equal to

B)

less than

C)

higher than

D)

None of the above

Correct Answer : higher than

36 .

The fire tubes in a Cochran boiler are

A)

vertical

B)

horizontal

C)

inclined

D)

None of the above

Correct Answer : horizontal

37 .

The diameter of Cornish boiler varies from

A)

1 to 2 m

B)

1.25 to 2.5 m

C)

2 to 3 m

D)

2.5 to 4.5 m

Correct Answer : 1 to 2 m

38 .

The aim of a compound steam engine is

A)

to reduce the length of stroke

B)

to reduce the ratio of expansion in each cylinder

C)

to reduce the temperature range in each cylinder

D)

All of the above

Correct Answer : All of the above

39 .

The average operating pressure of Benson boiler is

A)

100 bar

B)

150 bar

C)

200 bar

D)

250 bar

Correct Answer : 250 bar

40 .

Water tube boilers are

A)

internally fired

B)

externally fired

C)

internally as well as externally fired

D)

None of the above

Correct Answer : externally fired

41 .

For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

A)

one-half the height of chimney

B)

two times the height of chimney

C)

equal to the height of chimney

D)

four times the height of chimney

Correct Answer : equal to the height of chimney

42 .

In a boiler, the heat is lost

A)

to dry flue gases

B)

in moisture present in the fuel

C)

to steam formed by combustion of hydrogen per kg of fuel

D)

All of the above

Correct Answer : All of the above

43 .

The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called

A)

safety valve

B)

fusible plug

C)

pressure gauge

D)

water level indicator

Correct Answer : safety valve

44 .

Clearance ratio is the ratio of

A)

clearance volume to the swept volume

B)

volume at cut-off to the swept volume

C)

swept volume to the clearance volume

D)

clearance volume to the volume at cut-off

Correct Answer : clearance volume to the swept volume

45 .

In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of

A)

10 atmospheres

B)

20 atmospheres

C)

30 atmospheres

D)

40 atmospheres

Correct Answer : 20 atmospheres

46 .

In a Tandem type compound engine, the high pressure and low pressure cylinders

A)

are set at 90Â°

B)

have separate piston rods

C)

have common piston rod

D)

are set in V - arrangement

Correct Answer : have common piston rod

47 .

Lancashire boiler is used where working pressure and power required are

A)

low

B)

moderate

C)

high

D)

None of the above

Correct Answer : moderate

48 .

The amount of water evaporated or steam produced in kg per kg of fuel burnt is termed as evaporative capacity of a boiler.

A)

Agree

B)

Disagree

C)

Can Not Say

D)

None of the above

Correct Answer : Agree

49 .

The cylinder condensation or missing quantity may be reduced by

A)

the efficient steam jacketing of the cylinder walls

B)

keeping the expansion ratio small in each cylinder

C)

superheating the steam supplied to the engine cylinder

D)

All of the above

Correct Answer : All of the above

50 .

The actual vacuum in a condenser is equal to

A)

barometric pressure - actual pressure

B)

barometric pressure + actual pressure

C)

gauge pressure - atmospheric pressure

D)

gauge pressure + atmospheric pressure

Correct Answer : barometric pressure - actual pressure

51 .

Willian's line follows the law (where b = A constant representing the shape of the Willian's line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

A)

m = b/I.P. - a

B)

I.P. = b x m + a

C)

m = a + b x I.P

D)

I.P. = a x m + b

Correct Answer : m = a + b x I.P

52 .

The selection of type and size of a steam boiler depends upon

A)

the fuel and water available

B)

the power required and working pressure

C)

the geographical position of the power house

D)

All of the above

Correct Answer : All of the above

53 .

The artificial draught is produced by

A)

steam jet

B)

centrifugal fan

C)

Both (A) and (B)

D)

chimney

Correct Answer : Both (A) and (B)

54 .

The maximum steam pressure in a Locomotive boiler is limited to

A)

0.18 MN/mÂ²

B)

1.8 MN/mÂ²

C)

18 MN/mÂ²

D)

180 MN/mÂ²

Correct Answer : 1.8 MN/mÂ²

55 .

The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks

A)

0Â° to each other

B)

90Â° to each other

C)

180Â° to each other

D)

None of the above

Correct Answer : 90Â° to each other

56 .

The main object of a boiler trial is

A)

to prepare heat balance sheet for the boiler

B)

to determine the generating capacity of the boiler

C)

to determine the thermal efficiency of the boiler when working at a definite pressure

D)

All of the above

Correct Answer : All of the above

57 .

The diagram factor is the ratio of the

A)

actual workdone per stroke to the theoretical workdone per stroke

B)

actual mean effective pressure to the theoretical mean effective pressure

C)

area of the actual indicator diagram to the area of theoretical indicator diagram

D)

Any one of the above

Correct Answer : Any one of the above

58 .

Cut-off ratio is the ratio of

A)

volume at cut-off to the swept volume

B)

swept volume to the volume at cut-off

C)

volume at cut-off to the clearance volume

D)

clearance volume to the volume at cut-off

Correct Answer : volume at cut-off to the swept volume

59 .

By compounding the expansion of steam in two or more cylinders, the length of stroke

A)

increases

B)

does not change

C)

decreases

D)

None of the above

Correct Answer : decreases

60 .

Which of the following is a water tube boiler?

A)

Cochran boiler

B)

Babcock and Wilcox boiler

C)

Lancashire boiler

D)

Locomotive boiler

Correct Answer : Babcock and Wilcox boiler

61 .

The chimney draught varies with

A)

climatic conditions

B)

height of chimney

C)

temperature of furnace gases

D)

All of the above

Correct Answer : All of the above

62 .

The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

A)

chimney draught

B)

forced steam jet draught

C)

induced steam jet draught

D)

None of the above

Correct Answer : induced steam jet draught

63 .

The number of fire tubes in a Cochran boiler are

A)

75

B)

115

C)

165

D)

225

Correct Answer : 165

64 .

The actual power supplied by the engine crankshaft is called

A)

brake power

B)

indicated power

C)

frictional power

D)

None of the above

Correct Answer : brake power

65 .

In a La-mont boiler, there is a __________ circulation of water and steam.

A)

natural

B)

forced

C)

Can Not Say

D)

None of the above

Correct Answer : forced

66 .

Which of the following statement is wrong?

A)

The natural draught reduces the fuel consumption.

B)

The mechanical draught reduces the height of chimney.

C)

A balanced draught is a combination of induced and forced draught.

D)

All of the above

Correct Answer : The natural draught reduces the fuel consumption.

67 .

The diameter of internal flue tubes of a Lancashire boiler is about __________ that of its shell.

A)

one-half

B)

one-third

C)

one-fourth

D)

two-fifth

Correct Answer : two-fifth

68 .

Which of the following is a fire tube boiler?

A)

Lansashire boiler

B)

Yarrow boiler

C)

Babcock and Wilcox boiler

D)

None of the above

Correct Answer : Lansashire boiler

69 .

A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90Â° to each other, is called

A)

Woolf type compound engine

B)

Tandem type compound engine

C)

receiver type compound engine

D)

None of the above

Correct Answer : receiver type compound engine

70 .

For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is __________ the piston speed of single acting steam engine.

A)

equal to

B)

twice

C)

three times

D)

four times

Correct Answer : twice

71 .

Which of the following are boiler accessories?

A)

economiser

B)

superheater

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Both (A) and (B)

72 .

The capacity and working pressure.of a Cornish boiler is __________ as compared to Lancashire boiler.

A)

low

B)

high

C)

Can Not Say

D)

None of the above

Correct Answer : low

73 .

The length of Lancashire boiler varies from

A)

5 to 6 m

B)

6 to 7 m

C)

7.25 to 9 m

D)

9 to 10 m

Correct Answer : 7.25 to 9 m

74 .

When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

A)

internally fired boiler

B)

natural circulation boiler

C)

externally fired boiler

D)

forced circulation boiler

Correct Answer : natural circulation boiler

75 .

The ratio of heat equivalent to brake power to the energy supplied in steam is known as

A)

brake thermal efficiency

B)

overall efficiency

C)

mechanical efficiency

D)

indicated thermal efficiency

Correct Answer : brake thermal efficiency

76 .

When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as

A)

by-pass governing

B)

throttle governing

C)

cut-off governing

D)

None of the above

Correct Answer : throttle governing

77 .

The fire tubes in a Scotch marine boiler are

A)

vertical

B)

inclined

C)

horizontal

D)

None of the above

Correct Answer : horizontal

78 .

The function of a safety valve is

A)

to blow off steam when the pressure of steam inside the boiler exceeds the working pressure

B)

to measure pressure of steam inside the steam boiler

C)

to indicate the water level inside the boiler to an observer

D)

None of the above

Correct Answer : to blow off steam when the pressure of steam inside the boiler exceeds the working pressure

79 .

When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

A)

internally fired boiler

B)

externally fired boiler

C)

natural circulation boiler

D)

forced circulation boiler

Correct Answer : forced circulation boiler

80 .

The power of a boiler may be defined as

A)

the evaporation of 15.653 kg of water per hour from and at 100Â° C

B)

the amount of water evaporated or steam produced in kg per kg of fuel burnt

C)

the amount of water evaporated from and at 100Â° C into dry and saturated steam

D)

the ratio of heat actually used in producing the steam to the heat liberated in the furnace

Correct Answer : the amount of water evaporated or steam produced in kg per kg of fuel burnt

81 .

The shell diameter of a Locomotive boiler is

A)

1 m

B)

1.5 m

C)

2 m

D)

2.5 m

Correct Answer : 1.5 m

82 .

An air preheater is installed

A)

before the economiser

B)

before the superheater

C)

between the economiser and chimney

D)

None of the above

Correct Answer : between the economiser and chimney

83 .

The length of shell of a Locomotive boiler is

A)

1 m

B)

2 m

C)

3 m

D)

4 m

Correct Answer : 4 m

84 .

The value of diagram factor depends upon

A)

back pressure

B)

initial pressure of steam

C)

initial conditions of steam

D)

All of the above

Correct Answer : All of the above

85 .

The function of a valve rod is

A)

to provide reciprocating motion to the slide valve

B)

to provide simple harmonic motion to the D-slide valve

C)

to convert reciprocating motion of the piston into rotary motion of the crank

D)

to convert rotary motion of the crankshaft into to and fro motion of the valve rod

Correct Answer : to provide simple harmonic motion to the D-slide valve

86 .

The function of an eccentric rod is

A)

to convert rotary motion of the crankshaft into to and fro motion of the valve rod

B)

to provide reciprocating motion to the slide valve

C)

to provide simple harmonic motion to the D-slide valve

D)

to convert reciprocating motion of the piston into rotary motion of the crank

Correct Answer : to convert rotary motion of the crankshaft into to and fro motion of the valve rod

87 .

A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

A)

economiser

B)

steam boiler

C)

steam condenser

D)

steam preheater

Correct Answer : steam condenser

88 .

The principal function of a stop valve is to

A)

increase the temperature of saturated steam without raising its pressure

B)

put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

C)

control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

D)

empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

Correct Answer : control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

89 .

A water level indicator is a device to indicate the exact water level in the boiler at any instant.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

90 .

The length of Cornish boiler varies from

A)

2 to 4.5 m

B)

2 to 3 m

C)

3 to 5 m

D)

5 to 7.5 m

Correct Answer : 5 to 7.5 m

91 .

The indicated thermal efficiency is defined as the

A)

ratio of brake power to the indicated power

B)

ratio of heat equivalent to indicated power to the energy supplied in steam

C)

ratio of thermal efficiency to the Rankine efficiency

D)

product of thermal efficiency and Rankine efficiency

Correct Answer : ratio of heat equivalent to indicated power to the energy supplied in steam

92 .

The draught is the __________ of pressures above and below the fire grate.

A)

sum

B)

difference

C)

Can Not Say

D)

None of the above

Correct Answer : difference

93 .

The water tubes in a Babcock and Wilcox boiler are

A)

vertical

B)

horizontal

C)

inclined

D)

None of the above

Correct Answer : inclined

94 .

In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is __________ the atmospheric pressure.

A)

higher than

B)

equal to

C)

lower than

D)

None of the above

Correct Answer : higher than

95 .

Blow off cock in a boiler is used to

A)

increase the temperature of saturated steam without raising its pressure

B)

put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

C)

control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

D)

empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

Correct Answer : empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

96 .

Which of the following is not a boiler mounting?

A)

Economiser

B)

Fusible plug

C)

Blow off cock

D)

Feed check valve

Correct Answer : Economiser

97 .

The ratio of the clearance volume to the swept volume is called

A)

cut-off ratio

B)

expansion ratip

C)

clearance ratio

D)

None of the above

Correct Answer : clearance ratio

98 .

A __________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

A)

fusible plug

B)

stop valve

C)

safety valve

D)

blow off cock

Correct Answer : fusible plug

99 .

The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

A)

forced draught

B)

induced draught

C)

natural draught

D)

balanced draught

Correct Answer : induced draught

100 .

The shell of the Cochran boiler is made hemispherical

A)

to give maximum space and strength

B)

to withstand the pressure of steam inside the boiler

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Both (A) and (B)

101 .

The Locomotive boiler has

A)

127 fire tubes and 54 superheated tubes

B)

137 fire tubes and 44 superheated tubes

C)

147 fire tubes and 34 superheated tubes

D)

157 fire tubes and 24 superheated tubes

Correct Answer : 157 fire tubes and 24 superheated tubes

102 .

The relative efficiency is defined as the

A)

ratio of thermal efficiency to Rankine efficiency

B)

ratio of brake power to the indicated power

C)

product of thermal efficiency and Rankine efficiency

D)

ratio of heat equivalent to indicated power to the energy supplied in steam

Correct Answer : ratio of thermal efficiency to Rankine efficiency

103 .

Lancashire boiler has __________ internal flue tubes.

A)

one

B)

two

C)

three

D)

four

Correct Answer : two

104 .

When steam after doing work in the cylinder passes into a condenser, the engine is said to be a

A)

slow speed engine

B)

vertical steam engine

C)

condensing steam engine

D)

non-condensing steam engine

Correct Answer : condensing steam engine

105 .

Benson boiler is a __________ water tube steam boiler using forced circulation of water.

A)

low pressure

B)

high pressure

C)

Can Not Say

D)

None of the above

Correct Answer : high pressure

106 .

Locomotive boiler is a __________ boiler.

A)

fire tube

B)

water tube

C)

Can Not Say

D)

None of the above

Correct Answer : fire tube

107 .

The equivalent evaporation is defined as

A)

the evaporation of 15.653 kg of water per hour from and at 100Â° C

B)

the amount of water evaporated or steam produced in kg per kg of fuel burnt

C)

the ratio of heat actually used in producing the steam to the heat liberated in the furnace

D)

the amount of water evaporated from and at 100Â° C into dry and saturated steam

Correct Answer : the amount of water evaporated from and at 100Â° C into dry and saturated steam

108 .

The ratio of the __________ to the volume at cut-off is called expansion ratio.

A)

swept volume

B)

clearance volume

C)

Can Not Say

D)

None of the above

Correct Answer : swept volume

109 .

A closed vessel made of steel and used for the generation of steam is called a

A)

steam injector

B)

steam boiler

C)

steam turbine

D)

steam condenser

Correct Answer : steam boiler

110 .

An economiser is installed in a boiler primarily to

A)

superheat the steam

B)

increase steam pressure

C)

reduce fuel consumption

D)

All of the above

Correct Answer : reduce fuel consumption

111 .

The theoretical indicator diagram of a simple steam engine is based upon the assumption that

A)

there is no pressure drop due to condensation

B)

the expansion (or compression) of the steam is hyperbolic

C)

steam is admitted at boiler pressure and exhausted at condenser pressure

D)

All of the above

Correct Answer : All of the above

112 .

Lancashire boiler is

A)

horizontal boiler

B)

internally fired boiler

C)

stationary fire tube boiler

D)

All of the above

Correct Answer : All of the above

113 .

The diameter of a cylindrical shell of a Scotch marine boiler varies from

A)

1.5 to 2 m

B)

2.5 to 3.5 m

C)

3.5 to 4.5 m

D)

None of the above

Correct Answer : 2.5 to 3.5 m

114 .

In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is __________ the condenser pressure.

A)

lower than

B)

equal to

C)

higher than

D)

None of the above

Correct Answer : lower than

115 .

The fire tubes in a Locomotive boiler has __________ diameter.

A)

5.47 mm

B)

7.45 mm

C)

47.5 mm

D)

None of the above

Correct Answer : 47.5 mm

116 .

A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly

A)

340 kg/h

B)

280 kg/h

C)

210 kg/h

D)

150 kg/h

Correct Answer : 340 kg/h

117 .

Fire tube boilers are limited to a maximum working pressure of

A)

0.17 MN/mÂ²

B)

1.7 MN/mÂ²

C)

17 MN/mÂ²

D)

170 MN/mÂ²

Correct Answer : 1.7 MN/mÂ²

118 .

The average value of diagram factor lies between

A)

0.2 to 0.5

B)

0.5 to 0.65

C)

0.65 to 0.9

D)

0.8 to 1.2

Correct Answer : 0.65 to 0.9

119 .

The fittings mounted on the boiler for its proper and safe functioning is a

A)

safety valve

B)

pressure gauge

C)

water level indicatior

D)

All of the above

Correct Answer : All of the above

120 .

The amount of water evaporated from feed water at __________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.

A)

0°C

B)

40°C

C)

60°C

D)

100°C

Correct Answer : 100°C

121 .

The diameter of superheated tubes in a locomotive boiler is

A)

13 mm

B)

31 mm

C)

130 mm

D)

230 mm

Correct Answer : 130 mm

122 .

The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called

A)

forced steam jet draught

B)

chimney draught

C)

induced steam jet draught

D)

None of the above

Correct Answer : forced steam jet draught

123 .

The function of a crosshead is to guide motion of the __________ and to prevent it from bending.

A)

valve rod

B)

piston rod

C)

eccentric rod

D)

connecting rod

Correct Answer : piston rod

124 .

The function of a piston rod is

A)

to exhust steam from the cylinder at proper moment

B)

to transfer motion from the piston to the cross head

C)

to convert heat energy of the steam into mechanical work

D)

to guide motion of the piston rod and to prevent it from bending

Correct Answer : to transfer motion from the piston to the cross head

125 .

The cylinder dimensions of a compound engine may be designed on the basis of

A)

equal temperature drop in each cylinder for economy of steam

B)

equal power developed in each cylinder for uniform turning moment

C)

equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders

D)

All of the above

Correct Answer : All of the above

126 .

A device used to increase the temperature of saturated steam without raising its pressure, is called

A)

superheater

B)

fusible plug

C)

stop valve

D)

blow off cock

Correct Answer : superheater

127 .

A safety valve usually employed with stationary boilers is

A)

lever safety valve

B)

dead weight safety valve

C)

high steam and low water safety valve

D)

All of the above

Correct Answer : All of the above

128 .

Fire tube boilers are

A)

externally fired

B)

internally fired

C)

internally as well as externally fired

D)

None of the above

Correct Answer : internally fired

129 .

The diameter of flue tube in a Cornish boiler is __________ that of the shell.

A)

one-third

B)

two-fifth

C)

three-fifth

D)

None of the above

Correct Answer : three-fifth

130 .

The natural draught is produced by

A)

chimney

B)

steam jet

C)

centrifugal fan

D)

None of the above

Correct Answer : chimney

131 .

Willian's line for the steam engine is a straight line relationship between the steam consumption per hour and

A)

efficiency

B)

indicated power

C)

brake power

D)

pressure of steam

Correct Answer : indicated power

132 .

An economiser is generally placed between

A)

air preheater and chimney

B)

induced draft fan and forced draft fan

C)

Both (A) and (B)

D)

last superheater or reheater and air preheater

Correct Answer : last superheater or reheater and air preheater

133 .

A valve installed between the boiler and the feed pump is

A)

feed check valve

B)

blow off cock

C)

steam stop valve

D)

None of the above

Correct Answer : feed check valve

134 .

The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

A)

boiler efficiency

B)

nozzle efficiency

C)

condenser efficiency

D)

vacuum efficiency

Correct Answer : condenser efficiency

135 .

In fire tube boilers

A)

forced circulation takes place

B)

water passes through the tubes which are surrounded by flames and hot gases

C)

the flames and hot gases pass through the tubes which are surrounded by water

D)

None of the above

Correct Answer : the flames and hot gases pass through the tubes which are surrounded by water

136 .

The efficiency of a boiler is defined as

A)

ratio of the heat liberated in the furnace to the heat actually Used in producing steam

B)

ratio of heat actually used in producing steam to the heat liberated in the furnace

C)

ratio of the mass of steam produced to the mass of total water supplied in a given time

D)

None of the above

Correct Answer : ratio of heat actually used in producing steam to the heat liberated in the furnace

137 .

The working pressure range for a La-Mont boiler is

A)

7.5 to 10 MN/mÂ²

B)

3.5 to 20 MN/mÂ²

C)

1 to 15 MN/mÂ²

D)

0.5 to 10 MN/mÂ²

Correct Answer : 3.5 to 20 MN/mÂ²

138 .

The draught in locomotive boilers is produced by a

A)

steam jet

B)

chimney

C)

centrifugal fan

D)

None of the above

Correct Answer : steam jet

139 .

Which of the following is required for a steam condensing plant ?

A)

Condenser

B)

Condensate pump

C)

Air extraction pump

D)

All of the above

Correct Answer : All of the above

140 .

There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

A)

wet steam

B)

saturated steam

C)

cushion steam

D)

superheated steam

Correct Answer : cushion steam

141 .

The ratio of the volume at cut-off to the swept volume is called

A)

cut-off ratio

B)

clearance ratio

C)

expansion ratio

D)

None of the above

Correct Answer : cut-off ratio

142 .

The missing quantity per stroke is equal to

A)

mass of cushion steam + cylinder feed

B)

cylinder feed - indicated mass of steam

C)

cylinder feed + indicated mass of steam

D)

mass of cushion steam + indicated mass of steam

Correct Answer : cylinder feed - indicated mass of steam

143 .

A condenser where circulating water flows through tubes which are surrounded by steam, in known as

A)

jet condenser

B)

surface condenser

C)

barometric condenser

D)

evaporative condenser

Correct Answer : surface condenser

144 .

The forced circulation of water does not take place in

A)

Velox boiler

B)

Benson boiler

C)

La-Mont boiler

D)

Lancashire boiler

Correct Answer : Lancashire boiler

145 .

A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimny, is known as

A)

stop valve

B)

fusible plug

C)

economiser

D)

superheater

Correct Answer : economiser

146 .

Which of the following statement is correct for a compound steam engine ?

A)

The ratio of expansion is reduced, thus reducing the length of stroke.

B)

The forces in the working parts are increased as the forces are distributed over more parts.

C)

The temperature range per cylinder is increased, with corresponding increase in condensation.

D)

The cost of the engine, for the same power and economy, is more than that of a simple steam engine.

Correct Answer : The ratio of expansion is reduced, thus reducing the length of stroke.

147 .

When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

A)

slow speed engine

B)

high speed steam engine

C)

medium speed steam engine

D)

None of the above

Correct Answer : medium speed steam engine

148 .

The object of producing draught in a boiler is

A)

to provide an adequate supply of air for the fuel combustion

B)

to exhaust the gases of combustion from the combustion chamber

C)

to discharge the gases of combustion to the atmosphere through the chimney

D)

All of the above

Correct Answer : All of the above

149 .

In water tube boilers

A)

forced circulation takes place

B)

water passes through the tubes which are surrounded by flames and hot gases

C)

the flames and hot gases pass through the tubes which are surrounded by water

D)

None of the above

Correct Answer : water passes through the tubes which are surrounded by flames and hot gases

150 .

In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

A)

steam space

B)

chimney

C)

superheater

D)

water space also

Correct Answer : steam space

151 .

The ratio of the energy required to produce the artificial draught (expressed in metres head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

A)

power of the boiler

B)

efficiency of the fan

C)

efficiency of the chimney

D)

efficiency of the boiler

Correct Answer : efficiency of the chimney

152 .

The actual power generated in the engine cylinder is called

A)

indicated power

B)

brake power

C)

frictional power

D)

None of the above

Correct Answer : indicated power

153 .

The function of a piston in a steam engine is

A)

to transfer motion from the piston to the cross-head

B)

to guide motion of the piston rod and to prevent it from bending

C)

to convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

D)

None of the above

Correct Answer : to convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

154 .

The high steam and low water safety valve is not used in

A)

Cornish boiler

B)

Cochran boiler

C)

Lancashire boiler

D)

Locomotive boiler

Correct Answer : Locomotive boiler

155 .

In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

A)

50Â° C and 1.1 bar pressure

B)

50Â° C and normal atmospheric pressure

C)

100Â° C and 1.1 bar pressure

D)

100Â° C and normal atmospheric pressure

Correct Answer : 100Â° C and normal atmospheric pressure

156 .

In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is

A)

0.067 bar

B)

0.06 bar

C)

0.053 bar

D)

0.007 bar

Correct Answer : 0.067 bar

157 .

A compound steam engine in which piston rods of high pressure and low pressure cylinders ' are attached to two different cranks set at 180° to each other, is called

A)

Tandem type compound engine

B)

Woolf type compound engine

C)

receiver type compound engine

D)

None of the above

Correct Answer : Woolf type compound engine

158 .

The maximum heat loss is a boiler occurs due to

A)

dry flue gases

B)

unburnt carbon

C)

moisture in fuel

D)

steam formation

Correct Answer : dry flue gases

159 .

The performance of a boiler is measured by the

A)

steam produced in kg/h

B)

steam produced in kg/kg of fuel burnt

C)

amount of water evaporated per hour

D)

All of the above

Correct Answer : All of the above

160 .

Cut-off governing as compared to throttle governing is

A)

less efficient and more economical

B)

less efficient and less economical

C)

more efficient and more economical

D)

more efficient and less economical

Correct Answer : more efficient and more economical

161 .

Benson boiler requires

A)

no drum

B)

one drum

C)

two drums

D)

three drums

Correct Answer : no drum

162 .

The high pressure and low pressure cylinders in a Tandem type compound engine are regarded as having cranks

A)

0Â° to each other

B)

90Â° to each other

C)

180Â° to each other

D)

None of the above

Correct Answer : 0Â° to each other

163 .

The fire tubes in a Cochran boiler usually have __________ diameter.

A)

6.25 mm

B)

62.5 mm

C)

72.5 mm

D)

92.5 mm

Correct Answer : 62.5 mm

164 .

A condenser in a steam power plant

A)

reduces back pressure of steam

B)

increases expansion ratio of steam

C)

reduces temperature of exhaust steam

D)

All of the above

Correct Answer : All of the above

165 .

The ratio of the actual vacuum to the ideal vacuum in a condenser is called

A)

nozzle efficiency

B)

boiler efficiency

C)

vacuum efficiency

D)

condenser efficiency

Correct Answer : vacuum efficiency

166 .

The amount of water evaporated in kg per kg of fuel burnt is called

A)

boiler efficiency

B)

equivalent evaporation from and at 100Â° C

C)

evaporative capacity of a boiler

D)

None of the above

Correct Answer : evaporative capacity of a boiler

167 .

In forced circulation steam boilers, the force is applied

A)

to circulate water

B)

to draw water

C)

to drain off the water

D)

All of the above

Correct Answer : to circulate water