72 + Mcqs in Steam Boilers and Engines Page 1 McqOptions

1.	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
Answer» E.

Discussion

2.	Combustuion of fuel takes place __________ the engine cylinder of a steam engine.
A.	outside
B.	inside
Answer» B. inside

Discussion

3.	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.	economiser
B.	fusible plug
C.	superheater
D.	stop valve
Answer» B. fusible plug

Discussion

4.	The rate of flow of steam is __________ in case of fire tube boilers.
A.	less
B.	more
Answer» B. more

Discussion

5.	In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is __________ the lowpressure cylinder.
A.	equal to
B.	less than
C.	more than
Answer» C. more than

Discussion

6.	Babcock and Wilcox boiler is a stationary type of water tube boiler.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

7.	A Cochran boiler is a horizontal multi-tubular boiler.
A.	Yes
B.	No
Answer» C.

Discussion

8.	Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler ?
A.	Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler.
B.	Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler.
C.	Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes.
D.	Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube.
Answer» D. Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube.

Discussion

9.	The capacity and working pressure.of a Cornish boiler is __________ as compared to Lancashire boiler.
A.	low
B.	high
Answer» B. high

Discussion

10.	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
Answer» C. three times

Discussion

11.	Which of the following are boiler accessories ?
A.	economiser
B.	superheater
C.	both (a) and (b)
D.	none of these
Answer» D. none of these

Discussion

12.	In a La-mont boiler, there is a __________ circulation of water and steam.
A.	forced
B.	natural
Answer» B. natural

Discussion

13.	The diameter of internal flue tubes of a Lancashire boiler is about __________ that of its shell.
A.	one-fourth
B.	one-third
C.	two-fifth
D.	one-half
Answer» D. one-half

Discussion

14.	Locomotive boiler produces steam at a very high rate.
A.	Yes
B.	No
Answer» B. No

Discussion

15.	Which of the following is a fire tube boiler ?
A.	Lansashire boiler
B.	Babcock and Wilcox boiler
C.	Yarrow boiler
D.	none of these
Answer» B. Babcock and Wilcox boiler

Discussion

16.	A condenser maintains a low pressure (below atmospheric) so as to obtain the maximum possible energy from steam and thus to secure a high efficiency.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

17.	The amount of water evaporated from and at 100° C into dry and saturated steam is called evaporative capacity of a boiler.
A.	Yes
B.	No
Answer» C.

Discussion

18.	The difference between the atmospheric pressure and the absolute pressure is known as vacuum in a condenser.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

19.	The clearance in the engine cylinder has no effect on the steam consumption.
A.	True
B.	False
Answer» C.

Discussion

20.	For the same diameter and thickness of tube, a water tube boiler has __________ heating surface as compared to fire tube boiler.
A.	more
B.	less
C.	equal
Answer» B. less

Discussion

21.	In a double acting steam engine, the steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft.
A.	Yes
B.	No
Answer» C.

Discussion

22.	An economiser is used to increase the temperature of saturated steam without raising its pressure.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

23.	Water tube boilers produce steam at a __________ pressure than that of fire tube boilers.
A.	lower
B.	higher
Answer» C.

Discussion

24.	The ratio of the __________ to the volume at cut-off is called expansion ratio.
A.	swept volume
B.	clearance volume
Answer» B. clearance volume

Discussion

25.	In water tube boilers, the water passes through the tubes which are surrounded by flames and hot gases.
A.	Yes
B.	No
Answer» B. No

Discussion

26.	The function of a governor is to keep the engine speed uniform at all load conditions.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

27.	Benson boiler is a __________ water tube steam boiler using forced circulation of water.
A.	low pressure
B.	high pressure
Answer» C.

Discussion

28.	Locomotive boiler is a __________ boiler.
A.	fire tube
B.	water tube
Answer» B. water tube

Discussion

29.	The governing of steam engines keep the engine speed constant according to the changing load conditions
A.	Yes
B.	No
Answer» B. No

Discussion

30.	A Tandem type compound engine requires a larger flywheel.
A.	True
B.	False
Answer» B. False

Discussion

31.	In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is __________ the condenser pressure.
A.	equal to
B.	lower than
C.	higher than
Answer» D.

Discussion

32.	A compound steam engine requires a heavier flywheel than simple steam engines.
A.	True
B.	False
Answer» C.

Discussion

33.	The velocity of flue gases () through the chimney under a static draught of() metres is given by
A.	=
B.	=
C.	=
D.	/
E.	= 2
Answer» B. =

Discussion

34.	A good steam boiler is one which produces maximum quantity of steam with the given fuel
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

35.	The evaporative capacity of a boiler is defined as the evaporation of 15.653 kg of water per hour from and at 100° C.
A.	Yes
B.	No
Answer» C.

Discussion

36.	The amount of water evaporated or steam produced in kg per kg of fuel burnt is known as power of a boiler.
A.	True
B.	False
Answer» B. False

Discussion

37.	For maximum discharge through a chimney, the temperature of flue gases inside the chimney should the slightly more than the atmospheric temperature.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

38.	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
Answer» B. False

Discussion

39.	In a fire tube boiler, the water is contained inside the tubes which are surrounded by flames and hot gases from outside.
A.	True
B.	False
Answer» C.

Discussion

40.	Steam engines are called external combustion engines.
A.	Yes
B.	No
Answer» B. No

Discussion

41.	The draught is the __________ of pressures above and below the fire grate.
A.	sum
B.	difference
Answer» C.

Discussion

42.	The function of an eccentric is to provide __________ motion to the slide valve.
A.	reciprocating
B.	rotary
Answer» B. rotary

Discussion

43.	In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is __________ the atmospheric pressure.
A.	equal to
B.	lower than
C.	higher than
Answer» D.

Discussion

44.	The working pressure range for a La-Mont boiler is
A.	0.5 to 10 MN/m
B.	1 to 15 MN/m
C.	2.5 to 15 MN/m
D.	3.5 to 20 MN/m
Answer» E.

Discussion

45.	The crown of the fire box is made hemispherical in order to resist intense heat in the fire box.
A.	True
B.	False
Answer» B. False

Discussion

46.	Lancashire boiler is a stationary fire tube boiler.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

47.	Willian's law holds good for throttle-governed engine, but not for cut-off governed engine.
A.	True
B.	False
Answer» B. False

Discussion

48.	Which of the following is required for a steam condensing plant ?
A.	Condenser
B.	Condensate pump
C.	Air extraction pump
D.	all of these
Answer» E.

Discussion

49.	The cut-off ratio is the reciprocal of expansion ratio,
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

50.	The damper in a steam boiler is provided to control the draught (i.e. rate of flow of air) and thus regulate the rate of generation of steam.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

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.

Combustuion of fuel takes place __________ the engine cylinder of a steam engine.

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

The rate of flow of steam is __________ in case of fire tube boilers.

In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is __________ the lowpressure cylinder.

Babcock and Wilcox boiler is a stationary type of water tube boiler.

A Cochran boiler is a horizontal multi-tubular boiler.

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

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

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.

Which of the following are boiler accessories ?

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

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

Locomotive boiler produces steam at a very high rate.

Which of the following is a fire tube boiler ?

A condenser maintains a low pressure (below atmospheric) so as to obtain the maximum possible energy from steam and thus to secure a high efficiency.

The amount of water evaporated from and at 100° C into dry and saturated steam is called evaporative capacity of a boiler.

The difference between the atmospheric pressure and the absolute pressure is known as vacuum in a condenser.

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

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

In a double acting steam engine, the steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft.

An economiser is used to increase the temperature of saturated steam without raising its pressure.

Water tube boilers produce steam at a __________ pressure than that of fire tube boilers.

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

In water tube boilers, the water passes through the tubes which are surrounded by flames and hot gases.

The function of a governor is to keep the engine speed uniform at all load conditions.

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

Locomotive boiler is a __________ boiler.

The governing of steam engines keep the engine speed constant according to the changing load conditions

A Tandem type compound engine requires a larger flywheel.

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

A compound steam engine requires a heavier flywheel than simple steam engines.

The velocity of flue gases () through the chimney under a static draught of() metres is given by

A good steam boiler is one which produces maximum quantity of steam with the given fuel

The evaporative capacity of a boiler is defined as the evaporation of 15.653 kg of water per hour from and at 100° C.

The amount of water evaporated or steam produced in kg per kg of fuel burnt is known as power of a boiler.

For maximum discharge through a chimney, the temperature of flue gases inside the chimney should the slightly more than the atmospheric temperature.

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.

In a fire tube boiler, the water is contained inside the tubes which are surrounded by flames and hot gases from outside.

Steam engines are called external combustion engines.

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

The function of an eccentric is to provide __________ motion to the slide valve.

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

The working pressure range for a La-Mont boiler is

The crown of the fire box is made hemispherical in order to resist intense heat in the fire box.

Lancashire boiler is a stationary fire tube boiler.

Willian's law holds good for throttle-governed engine, but not for cut-off governed engine.

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

The cut-off ratio is the reciprocal of expansion ratio,

The damper in a steam boiler is provided to control the draught (i.e. rate of flow of air) and thus regulate the rate of generation of steam.