1000+ Steam Boilers, Engines, Nozzles & Turbines Multiple Choice Question Answer [Solved]
Thursday 9th of March 2023
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1. 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 : B
A. 6.25 mm
B. 62.5 mm
C. 72.5 mm
D. 92.5 mm
Answer : B
2. The efficiency of steam turbines may be improved by
A. Reheating of steam
B. Regenerative feed heating
C. Binary vapour plant
D. Any one of these
Answer : D
A. Reheating of steam
B. Regenerative feed heating
C. Binary vapour plant
D. Any one of these
Answer : D
3. The high pressure and low pressure cylinders in a Tandem type compound engine are regarded as having cranks
A. 180° to each other
B. 90° to each other
C. 0° to each other
D. None of these
Answer : C
A. 180° to each other
B. 90° to each other
C. 0° to each other
D. None of these
Answer : C
4. The best suited coal for chain or travelling grate stoker boiler is
A. Coking coal
B. Non-coking or free burning coal
C. Pulverised coal
D. High sulphur coal
Answer : B
A. Coking coal
B. Non-coking or free burning coal
C. Pulverised coal
D. High sulphur coal
Answer : B
5. The shell diameter and length of locomotive boiler are
A. 1.5 m, 4 m
B. 1.5 m, 6 m
C. 1 m, 4 m
D. 2 m, 4 m
Answer : A
A. 1.5 m, 4 m
B. 1.5 m, 6 m
C. 1 m, 4 m
D. 2 m, 4 m
Answer : A
6. Which of the following statement is correct?
A. The efficiency of steam turbines is greater than steam engines
B. A flywheel is a must for steam turbine
C. The turbine blades do not change the direction of steam issuing from the nozzle
D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
Answer : A
A. The efficiency of steam turbines is greater than steam engines
B. A flywheel is a must for steam turbine
C. The turbine blades do not change the direction of steam issuing from the nozzle
D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
Answer : A
7. Rateau turbine is
A. Simple reaction turbine
B. Velocity compounded turbine
C. Pressure compounded turbine
D. Pressure-velocity compounded turbine
Answer : C
A. Simple reaction turbine
B. Velocity compounded turbine
C. Pressure compounded turbine
D. Pressure-velocity compounded turbine
Answer : C
8. The reheat factor depends upon
A. Initial pressure and superheat
B. Exit pressure
C. Turbine stage efficiency
D. All of these
Answer : D
A. Initial pressure and superheat
B. Exit pressure
C. Turbine stage efficiency
D. All of these
Answer : D
9. The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
A. Remains same
B. Decreases
C. Increases
D. None of these
Answer : C
A. Remains same
B. Decreases
C. Increases
D. None of these
Answer : C
10. Expanding steam to a very low pressure (high vacuum) in steam engines is
A. Desirable
B. Economical
C. Essential
D. Uneconomical
Answer : D
A. Desirable
B. Economical
C. Essential
D. Uneconomical
Answer : D
11. In a single acting steam engine
A. The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft
B. The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft
C. The steam is admitted on one side of the piston and two working strokes are 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
Answer : A
A. The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft
B. The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft
C. The steam is admitted on one side of the piston and two working strokes are 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
Answer : A
12. The forced circulation of water does not take place in
A. LaMont boiler
B. Lancashire boiler
C. Velox boiler
D. Benson boiler
Answer : B
A. LaMont boiler
B. Lancashire boiler
C. Velox boiler
D. Benson boiler
Answer : B
13. The maximum discharge of steam through a convergent-divergent nozzle depends upon
A. Area of nozzle at throat
B. Initial pressure and volume of steam
C. Final pressure of steam leaving the nozzle
D. Both (A) and (B)
Answer : D
A. Area of nozzle at throat
B. Initial pressure and volume of steam
C. Final pressure of steam leaving the nozzle
D. Both (A) and (B)
Answer : D
14. The friction present between the steam and the nozzle surfaces reduces the heat drop by
A. 10 to 15 %
B. 15 to 25 %
C. 25 to 40 %
D. 40 to 60 %
Answer : A
A. 10 to 15 %
B. 15 to 25 %
C. 25 to 40 %
D. 40 to 60 %
Answer : A
15. Caking coals are those which
A. Form lumps or masses of coke
B. Burn freely
C. Show little or no fusing action
D. Burn completely
Answer : A
A. Form lumps or masses of coke
B. Burn freely
C. Show little or no fusing action
D. Burn completely
Answer : A
16. The basic job of feed water treatment in boilers is to overcome the problem of
A. Corrosion
B. Scale
C. Carryover
D. All of the above
Answer : D
A. Corrosion
B. Scale
C. Carryover
D. All of the above
Answer : D
17. Which of the following statement is wrong?
A. Locomotive boiler is a water tube boiler
B. Water tube boilers are internally fired
C. Lamont boiler is a low pressure water tube boiler
D. All of the above
Answer : D
A. Locomotive boiler is a water tube boiler
B. Water tube boilers are internally fired
C. Lamont boiler is a low pressure water tube boiler
D. All of the above
Answer : D
18. Locomotive boiler is of the following type
A. Multi tubular
B. Horizontal
C. Internally fired
D. All of the above
Answer : D
A. Multi tubular
B. Horizontal
C. Internally fired
D. All of the above
Answer : D
19. Willians line for the steam engine is a straight line relationship between the steam consumption per hour and
A. Indicated power
B. Brake power
C. Efficiency
D. Pressure of steam
Answer : A
A. Indicated power
B. Brake power
C. Efficiency
D. Pressure of steam
Answer : A
20. 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 : C
A. One-fourth
B. One-third
C. Two-fifth
D. One-half
Answer : C
21. A condenser in a steam power plant
A. Increases expansion ratio of steam
B. Reduces back pressure of steam
C. Reduces temperature of exhaust steam
D. All of these
Answer : D
A. Increases expansion ratio of steam
B. Reduces back pressure of steam
C. Reduces temperature of exhaust steam
D. All of these
Answer : D
22. The feed check valve is used in order to
A./strong> Regulate flow of boiler water
B. Check level of water in boiler drum
C. Recirculate unwanted feed water
D. Allow high pressure feed water to flow to drum and not allow reverse flow to take place
Answer : D
A./strong> Regulate flow of boiler water
B. Check level of water in boiler drum
C. Recirculate unwanted feed water
D. Allow high pressure feed water to flow to drum and not allow reverse flow to take place
Answer : D
23. In an impulse turbine
A. The steam is expanded in nozzles only and there is a pressure drop and heat drop
B. The steam is expanded both in fixed and moving blades continuously
C. The steam is expanded in moving blades only
D. The pressure and temperature of steam remains constant
Answer : A
A. The steam is expanded in nozzles only and there is a pressure drop and heat drop
B. The steam is expanded both in fixed and moving blades continuously
C. The steam is expanded in moving blades only
D. The pressure and temperature of steam remains constant
Answer : A
24. O? content in atmospheric air on volume basis is
A. 21 %
B. 23 %
C. 30 %
D. 40 %
Answer : A
A. 21 %
B. 23 %
C. 30 %
D. 40 %
Answer : A
25. The flow of steam is supersonic
A. At the entrance to the nozzle
B. At the throat of the nozzle
C. In the convergent portion of the nozzle
D. In the divergent portion of the nozzle
Answer : D
A. At the entrance to the nozzle
B. At the throat of the nozzle
C. In the convergent portion of the nozzle
D. In the divergent portion of the nozzle
Answer : D
26. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by
A. Throttling calorimeter
B. Separating calorimeter
C. Combined separating and throttling calorimeter
D. Bucket calorimeter
Answer : A
A. Throttling calorimeter
B. Separating calorimeter
C. Combined separating and throttling calorimeter
D. Bucket calorimeter
Answer : A
27. During storage, the heating value of coal
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease depending upon the method of storage
Answer : B
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease depending upon the method of storage
Answer : B
28. Which is not correct statement about pulverised fuel firing?
A. High burning rate is possible
B. Heat release can be easily controlled
C. Fuel burns economically
D. It is the best technique for burning high ash content fuel having low fusion ash
Answer : D
A. High burning rate is possible
B. Heat release can be easily controlled
C. Fuel burns economically
D. It is the best technique for burning high ash content fuel having low fusion ash
Answer : D
29. Lancashire boiler has __________ internal flue tubes.
A. One
B. Two
C. Three
D. Four
Answer : B
A. One
B. Two
C. Three
D. Four
Answer : B
30. The three Ts for good combustion are
A. Temperature, time, and turbulence
B. Total air, true fuel, and turbulence
C. Thorough mixing, total air and temperature
D. Total air, time, and temperature
Answer : A
A. Temperature, time, and turbulence
B. Total air, true fuel, and turbulence
C. Thorough mixing, total air and temperature
D. Total air, time, and temperature
Answer : A
31. The safety valve at superheater as compared to drum safety valve setting is set at
A. Higher value
B. Lower value
C. Same value
D. Any value
Answer : B
A. Higher value
B. Lower value
C. Same value
D. Any value
Answer : B
32. An ideal regenerative cycle is
A. Equal to Carnot cycle
B. Less than Carnot cycle
C. More than Carnot cycle
D. Could be anything
Answer : B
A. Equal to Carnot cycle
B. Less than Carnot cycle
C. More than Carnot cycle
D. Could be anything
Answer : B
33. 1 kg.m is equal to
A. 9.81 Joules
B. 102 Joules
C. 427 Joules
D. None of these
Answer : A
A. 9.81 Joules
B. 102 Joules
C. 427 Joules
D. None of these
Answer : A
34. The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as
A. Equivalent evaporation
B. Factor of evaporation
C. Boiler efficiency
D. Power of a boiler
Answer : C
A. Equivalent evaporation
B. Factor of evaporation
C. Boiler efficiency
D. Power of a boiler
Answer : C
35. 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. 0.007 bar
B. 0.053 bar
C. 0.06 bar
D. 0.067 bar
Answer : D
A. 0.007 bar
B. 0.053 bar
C. 0.06 bar
D. 0.067 bar
Answer : D
36. Superheating of steam is done at
A. Constant volume
B. Constant temperature
C. Constant pressure
D. Constant entropy
Answer : C
A. Constant volume
B. Constant temperature
C. Constant pressure
D. Constant entropy
Answer : C
37. Bomb calorimeter is used to determine
A. Higher calorific value at constant volume
B. Lower calorific value at constant volume
C. Higher calorific value at constant pressure
D. Lower calorific value at constant pressure
Answer : A
A. Higher calorific value at constant volume
B. Lower calorific value at constant volume
C. Higher calorific value at constant pressure
D. Lower calorific value at constant pressure
Answer : A
38. The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become
A. Wet
B. Superheated
C. Remain dry saturated
D. Dry
Answer : B
A. Wet
B. Superheated
C. Remain dry saturated
D. Dry
Answer : B
39. Steam engine operates on
A. Carnot cycle
B. Joule cycle
C. Stirling cycle
D. Brayton cycle
Answer : D
A. Carnot cycle
B. Joule cycle
C. Stirling cycle
D. Brayton cycle
Answer : D
40. Which of the following is steam dial?
A. Non-coking bituminous coal
B. Brown coal
C. Pulverised coal
D. Coking bituminous coal
Answer : A
A. Non-coking bituminous coal
B. Brown coal
C. Pulverised coal
D. Coking bituminous coal
Answer : A
41. The Parsons' reaction turbine has
A. Only moving blades
B. Only fixed blades
C. Identical fixed and moving blades
D. Fixed and moving blades of different shape
Answer : C
A. Only moving blades
B. Only fixed blades
C. Identical fixed and moving blades
D. Fixed and moving blades of different shape
Answer : C
42. 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
Answer : D
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
Answer : D
43. Lancashire boiler is used where working pressure and power required are
A. Low
B. Moderate
C. High
D. None of these
Answer : B
A. Low
B. Moderate
C. High
D. None of these
Answer : B
44. The safety valve on boiler drum compared to safety valve on superheater is set at
A. Same value
B. Higher value
C. Lower value
D. Lower/higher depending on steam flow
Answer : B
A. Same value
B. Higher value
C. Lower value
D. Lower/higher depending on steam flow
Answer : B
45. The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become
A. Wet
B. Superheated
C. Remain dry saturated
D. Dry
Answer : A
A. Wet
B. Superheated
C. Remain dry saturated
D. Dry
Answer : A
46. If the critical pressure ratio for steam is 0.546, then the steam is initially
A. Wet steam
B. Dry saturated steam
C. Superheated steam
D. None of these
Answer : C
A. Wet steam
B. Dry saturated steam
C. Superheated steam
D. None of these
Answer : C
47. Which of the following statement is wrong?
A. The mechanical draught reduces the height of chimney.
B. The natural draught reduces the fuel consumption.
C. A balanced draught is a combination of induced and forced draught.
D. All of the above
Answer : B
A. The mechanical draught reduces the height of chimney.
B. The natural draught reduces the fuel consumption.
C. A balanced draught is a combination of induced and forced draught.
D. All of the above
Answer : B
48. Film boiling occurs at
A. Very low pressure
B. Atmospheric pressures
C. Medium pressures
D. Very high pressures
Answer : D
A. Very low pressure
B. Atmospheric pressures
C. Medium pressures
D. Very high pressures
Answer : D
49. 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 : C
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 : C
50. Pick up wrong statement about desired properties of a good fuel
A. High calorific value
B. Produce minimum smoke and gases
C. Ease in storing
D. High ignition point
Answer : D
A. High calorific value
B. Produce minimum smoke and gases
C. Ease in storing
D. High ignition point
Answer : D
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