564 + Mcqs in Steam Boilers and Engines McqOptions

1.	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
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

2.	A compound steam engine requires a heavier flywheel than simple steam engines.
A.	True
B.	False
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

3.	A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly
A.	1.05
B.	2.86
C.	6.65
D.	10.05
Answer» C. 6.65

Discussion

4.	The average operating pressure of Benson boiler is
A.	100 bar
B.	150 bar
C.	200 bar
D.	250 bar
Answer» E.

Discussion

5.	The cylinder dimensions of a compound engine may be designed on the basis of
A.	equal power developed in each cylinder for uniform turning moment
B.	equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
C.	equal temperature drop in each cylinder for economy of steam
D.	all of the above
Answer» E.

Discussion

6.	The function of a crosshead is to guide motion of the __________ and to prevent it from bending.
A.	piston rod
B.	connecting rod
C.	eccentric rod
D.	valve rod
Answer» B. connecting rod

Discussion

7.	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.	induced steam jet draught
B.	chimney draught
C.	forced steam jet draught
D.	none of these
Answer» D. none of these

Discussion

8.	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.	medium speed steam engine
C.	high speed steam engine
D.	none of these
Answer» C. high speed steam engine

Discussion

9.	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.	water space also
B.	chimney
C.	steam space
D.	superheater
Answer» D. superheater

Discussion

10.	A single acting steam engine produces __________ power than that of double acting steam engine.
A.	equal
B.	half
C.	double
D.	four times
Answer» C. double

Discussion

11.	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
Answer» E.

Discussion

12.	The velocity of flue gases (V) through the chimney under a static draught of(H') metres is given by
A.	V = 2g H'
B.	V = 2g/H'
C.	V = H'/2g
D.	V = 2gH'
Answer» B. V = 2g/H'

Discussion

13.	Which of the following statement is correct ?
A.	Lancashire boiler is a fire tube boiler.
B.	Fire tube boilers are internally fired.
C.	Babcock and Wilcox boiler is a water tube boiler.
D.	all of the above
Answer» E.

Discussion

14.	A safety valve mainly used with locomotive and marine boilers is
A.	lever safety valve
B.	dead weight safety valve
C.	high steam and low water safety valve
D.	spring loaded safety valve
Answer» E.

Discussion

15.	The number of fire tubes in a Cochran boiler are
A.	75
B.	115
C.	165
D.	225
Answer» D. 225

Discussion

16.	Water tube boilers produce steam at a __________ pressure than that of fire tube boilers.
A.	lower
B.	higher
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

17.	The difference between the atmospheric pressure and the absolute pressure is known as vacuum in a condenser.
A.	Agree
B.	Disagree
C.	Can't say
D.	None of these
Answer» B. Disagree

Discussion

18.	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
D.	None of these
Answer» D. None of these

Discussion

19.	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

20.	The water tube boilers produce steam at a __________ pressure than that of fire tube boilers.
A.	lower
B.	higher
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

21.	Locomotive boiler is a __________ boiler.
A.	fire tube
B.	water tube
C.	Can't say
D.	None of these
Answer» B. water tube

Discussion

22.	Lancashire boiler is a stationary fire tube boiler.
A.	Agree
B.	Disagree
C.	Can't say
D.	None of these
Answer» B. Disagree

Discussion

23.	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
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

24.	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

25.	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't say
D.	None of these
Answer» B. Disagree

Discussion

26.	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
C.	Can't say
D.	None of these
Answer» B. False

Discussion

27.	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.	I.P. = a x m + b
B.	m = a + b x I.P.
C.	I.P. = b x m + a
D.	m = b/I.P. - a
Answer» C. I.P. = b x m + a

Discussion

28.	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
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

29.	The boiler efficiency is given by (where m = Total mass of water evaporated into steam in kg/h, mf = Mass of fuel in kg/h, C = Calorific valve of fuel in kJ/kg of fuel, h = Total heat of steam in kJ/kg, and hf1 = Sensible heat of feed water in kJ /kg)
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

30.	The mechanical draught __________ with the amount of smoke.
A.	increases
B.	decreases
C.	does not effect
D.	None of these
Answer» C. does not effect

Discussion

31.	Babcock and Wilcox boiler is a stationary type of water tube boiler.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

32.	The working pressure range for a La-Mont boiler is
A.	0.5 to 10 MN/m²
B.	1 to 15 MN/m²
C.	2.5 to 15 MN/m²
D.	3.5 to 20 MN/m²
Answer» E.

Discussion

33.	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
D.	None of these
Answer» C. more than

Discussion

34.	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.	blow off cock
B.	fusible plug
C.	stop valve
D.	safety valve
Answer» C. stop valve

Discussion

35.	The function of a governor is to keep the engine speed uniform at all load conditions.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

36.	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
C.	Can't say
D.	None of these
Answer» C. Can't say

Discussion

37.	Cut-off governing of steam engines is a method of controlling the engine output by varying
A.	volume of intake steam
B.	pressure of intake steam
C.	temperature of intake steam
D.	all of these
Answer» B. pressure of intake steam

Discussion

38.	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
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

39.	The function of an eccentric is to provide __________ motion to the slide valve.
A.	reciprocating
B.	rotary
C.	Can't say
D.	None of these
Answer» B. rotary

Discussion

40.	In a compound steam engine, the temperature range per cylinder is reduced, with corresponding reduction in the condensation.
A.	Correct
B.	Incorrect
C.	Can't say
D.	None of these
Answer» B. Incorrect

Discussion

41.	The capacity and working pressure.of a Cornish boiler is __________ as compared to Lancashire boiler.
A.	low
B.	high
C.	Can't say
D.	None of these
Answer» B. high

Discussion

42.	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 these
Answer» E.

Discussion

43.	A device used to increase the temperature of saturated steam without raising its pressure, is called
A.	blow off cock
B.	fusible plug
C.	superheater
D.	stop valve
Answer» D. stop valve

Discussion

44.	When the nozzle operates with the maximum mass flow, the nozzle is said to be
A.	Choked
B.	Under-damping
C.	Over-damping
D.	None of these
Answer» B. Under-damping

Discussion

45.	When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
A.	Choked
B.	Under-damping
C.	Over-damping
D.	None of these
Answer» C. Over-damping

Discussion

46.	Hard coke is produced by carburization of coal at
A.	Atmospheric temperature
B.	500-600°C
C.	700-850°C
D.	950-1100°C
Answer» E.

Discussion

47.	One kg of steam sample contains 0.8 kg dry steam? Its dryness fraction is
A.	0.2
B.	0.8
C.	1.0
D.	0.6
Answer» C. 1.0

Discussion

48.	In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is
A.	40 %
B.	25 %
C.	50 %
D.	80 %
Answer» E.

Discussion

49.	The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)
A.	sin²α
B.	cos²α
C.	tan²α
D.	cot²α
Answer» C. tan²α

Discussion

50.	The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)
A.	Vb = 0.5 V cosα
B.	Vb = V cosα
C.	Vb = 0.5 V² cosα
D.	Vb = V² cosα
Answer» B. Vb = V cosα

Discussion

Explore topic-wise MCQs in Testing Subject.

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

A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly

The average operating pressure of Benson boiler is

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

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

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

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

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

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

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

Which of the following statement is correct ?

A safety valve mainly used with locomotive and marine boilers is

The number of fire tubes in a Cochran boiler are

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

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

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

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

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

Locomotive boiler is a __________ boiler.

Lancashire boiler is a stationary 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.

Which of the following is a fire tube boiler ?

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

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

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)

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.

The boiler efficiency is given by (where m = Total mass of water evaporated into steam in kg/h, mf = Mass of fuel in kg/h, C = Calorific valve of fuel in kJ/kg of fuel, h = Total heat of steam in kJ/kg, and hf1 = Sensible heat of feed water in kJ /kg)

The mechanical draught __________ with the amount of smoke.

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

The working pressure range for a La-Mont boiler is

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 __________ 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.

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

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

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

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

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

In a compound steam engine, the temperature range per cylinder is reduced, with corresponding reduction in the condensation.

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

A safety valve usually employed with stationary boilers is

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

When the nozzle operates with the maximum mass flow, the nozzle is said to be

When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

Hard coke is produced by carburization of coal at

One kg of steam sample contains 0.8 kg dry steam? Its dryness fraction is

In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is

The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)