564 + Mcqs in Steam Boilers and Engines Page 1 McqOptions

1.	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't say
D.	None of these
Answer» B. Incorrect

Discussion

2.	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
Answer» C. 72.5 mm

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.	A Cochran boiler is a horizontal multi-tubular boiler.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

5.	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

6.	Locomotive boiler produces steam at a very high rate.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» B. No

Discussion

7.	The ratio of heat actually used in producing the steam to the heat liberated in the furnace is known as equivalent evaporation from and at 100° C.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

8.	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
C.	Can't say
D.	None of these
Answer» B. Disagree

Discussion

9.	In a La-mont boiler, there is a __________ circulation of water and steam.
A.	forced
B.	natural
C.	Can't say
D.	None of these
Answer» B. natural

Discussion

10.	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't say
D.	None of these
Answer» B. False

Discussion

11.	Which of the following is correct ? (where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)
A.	pa = pm/K
B.	pa = pm x K
C.	pa = K/pm
D.	pa = pm + K
Answer» C. pa = K/pm

Discussion

12.	The cut-off ratio is the reciprocal of expansion ratio,
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

13.	In surface condensers, the condensate and the cooling water mixes up.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

14.	A Tandem type compound engine requires a larger flywheel.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» B. False

Discussion

15.	An economiser is used to increase the temperature of saturated steam without raising its pressure.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

16.	Benson boiler is a __________ water tube steam boiler using forced circulation of water.
A.	low pressure
B.	high pressure
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

17.	Combustuion of fuel takes place __________ the engine cylinder of a steam engine.
A.	outside
B.	inside
C.	Can't say
D.	None of these
Answer» B. inside

Discussion

18.	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't say
D.	None of these
Answer» B. False

Discussion

19.	When the expansion of steam is carried out in a single cylinder and then exhausted into the atmosphere or a condenser, the engine is said to be a simple steam engine.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

20.	The missing quantity is mainly due to cylinder condensation and a small amount of steam leakage past the valves and piston.
A.	Agree
B.	Disagree
C.	Can't say
D.	None of these
Answer» B. Disagree

Discussion

21.	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
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

22.	The function of a D-slide valve is to exhaust steam from the cylinder at proper moment.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

23.	The motion of a D-slide valve in a steam engine is simple harmonic.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» B. No

Discussion

24.	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

25.	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
D.	None of these
Answer» D. None of these

Discussion

26.	The draught is the __________ of pressures above and below the fire grate.
A.	sum
B.	difference
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

27.	In water tube boilers, the water passes through the tubes which are surrounded by flames and hot gases.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» B. No

Discussion

28.	The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height ot the chimney in metres, and T1 = Absolute temperature of air outside the chimney in K)
A.	T₁/88.25 H
B.	88.25 H/T₁
C.	T₁/176.5 H
D.	176.5 H/T₁
Answer» E.

Discussion

29.	A receiver type compound engine, requires a lighter flywheel.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» B. No

Discussion

30.	Steam engines are called external combustion engines.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» B. No

Discussion

31.	Cornish boilers are multi-tubular boilers.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

32.	The rate of flow of steam is __________ in case of fire tube boilers.
A.	less
B.	more
C.	Can't say
D.	None of these
Answer» B. more

Discussion

33.	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

34.	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.	superheater
B.	air preheater
C.	economiser
D.	injector
Answer» C. economiser

Discussion

35.	The governing of steam engines keep the engine speed constant according to the changing load conditions
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» B. No

Discussion

36.	There is about 15 to 20% of coal saving when an economiser is used in a boiler.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» B. False

Discussion

37.	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

38.	Which of the following is a water tube boiler ?
A.	Lancashire boiler
B.	Babcock and Wilcox boiler
C.	Locomotive boiler
D.	Cochran boiler
Answer» C. Locomotive boiler

Discussion

39.	The ratio of the __________ to the volume at cut-off is called expansion ratio.
A.	swept volume
B.	clearance volume
C.	Can't say
D.	None of these
Answer» B. clearance volume

Discussion

40.	A device used to empty the boiler whenever required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler, is called blow off cock.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» B. No

Discussion

41.	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.	efficiency of the boiler
B.	efficiency of the chimney
C.	efficiency of the fan
D.	power of the boiler
Answer» C. efficiency of the fan

Discussion

42.	Willian's law holds good for throttle-governed engine, but not for cut-off governed engine.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» B. False

Discussion

43.	The crown of the fire box is made hemispherical in order to resist intense heat in the fire box.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» B. False

Discussion

44.	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
D.	None of these
Answer» B. less

Discussion

45.	A good steam boiler is one which produces maximum quantity of steam with the given fuel
A.	Agree
B.	Disagree
C.	Can't say
D.	None of these
Answer» B. Disagree

Discussion

46.	The mechanical draught produces more draught than natural draught.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» B. False

Discussion

47.	Which of the following compound steam engine requires a smaller flywheel ?
A.	Receiver type
B.	Tandem type
C.	Woolf type
D.	all of these
Answer» B. Tandem type

Discussion

48.	The clearance in the engine cylinder has no effect on the steam consumption.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

49.	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

50.	The function of a superheater is to heat the feed water by utilising the heat in the exhaust flue gases before leaving through the chimney.
A.	Yes
B.	No
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

Explore topic-wise MCQs in Automobile Engineering.

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

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

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 Cochran boiler is a horizontal multi-tubular boiler.

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

Locomotive boiler produces steam at a very high rate.

The ratio of heat actually used in producing the steam to the heat liberated in the furnace is known as equivalent evaporation from and at 100° C.

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.

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

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.

Which of the following is correct ? (where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

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

In surface condensers, the condensate and the cooling water mixes up.

A Tandem type compound engine requires a larger flywheel.

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

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

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

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

When the expansion of steam is carried out in a single cylinder and then exhausted into the atmosphere or a condenser, the engine is said to be a simple steam engine.

The missing quantity is mainly due to cylinder condensation and a small amount of steam leakage past the valves and piston.

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

The function of a D-slide valve is to exhaust steam from the cylinder at proper moment.

The motion of a D-slide valve in a steam engine is simple harmonic.

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.

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

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

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

The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height ot the chimney in metres, and T1 = Absolute temperature of air outside the chimney in K)

A receiver type compound engine, requires a lighter flywheel.

Steam engines are called external combustion engines.

Cornish boilers are multi-tubular boilers.

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

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

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

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

There is about 15 to 20% of coal saving when an economiser is used in a boiler.

Which of the following are boiler accessories ?

Which of the following is a water tube boiler ?

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

A device used to empty the boiler whenever required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler, is called blow off cock.

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

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

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

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

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

The mechanical draught produces more draught than natural draught.

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

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

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.

The function of a superheater is to heat the feed water by utilising the heat in the exhaust flue gases before leaving through the chimney.