Steam Boilers, Engines, Nozzles & Turbines 1000+ MCQ with answer for RRB ALP
Thursday 9th of March 2023
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1. Which device is used in thermal power plants to reduce level of pollution?
A. Induced draft fan
B. Smoke meter
C. Chimney
D. Precipitator
Answer : D
A. Induced draft fan
B. Smoke meter
C. Chimney
D. Precipitator
Answer : D
2. 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. Superheated steam
D. Cushion steam
Answer : D
A. Wet steam
B. Saturated steam
C. Superheated steam
D. Cushion steam
Answer : D
3. The power of a boiler may be defined as
A. The ratio of heat actually used in producing the steam to the heat liberated in the furnace
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 100° C into dry and saturated steam
D. The evaporation of 15.653 kg of water per hour from and at 100° C
Answer : B
A. The ratio of heat actually used in producing the steam to the heat liberated in the furnace
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 100° C into dry and saturated steam
D. The evaporation of 15.653 kg of water per hour from and at 100° C
Answer : B
4. Spontaneous combustion is a phenomenon in which
A. All the fuel burns instantaneously producing high energy release
B. Fuel burns with less air
C. Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
D. Explosion in furnace
Answer : C
A. All the fuel burns instantaneously producing high energy release
B. Fuel burns with less air
C. Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
D. Explosion in furnace
Answer : C
5. 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
6. The function of an eccentric rod is
A. To provide reciprocating motion to the slide valve
B. To convert reciprocating motion of the piston into rotary motion of the crank
C. To convert rotary motion of the crankshaft into to and fro motion of the valve rod
D. To provide simple harmonic motion to the D-slide valve
Answer : C
A. To provide reciprocating motion to the slide valve
B. To convert reciprocating motion of the piston into rotary motion of the crank
C. To convert rotary motion of the crankshaft into to and fro motion of the valve rod
D. To provide simple harmonic motion to the D-slide valve
Answer : C
7. In an impulse turbine, steam expands
A. Wholly in blades
B. Wholly in nozzle
C. Partly in the nozzle and partly in blades
D. None of these
Answer : B
A. Wholly in blades
B. Wholly in nozzle
C. Partly in the nozzle and partly in blades
D. None of these
Answer : B
8. The effect of friction on the flow of steam through a nozzle is to
A. Decrease the mass flow rate and to increase the wetness of steam
B. Increase the mass flow rate and to increase the exit temperature
C. Decrease the mass flow rate and to decrease the wetness of steam
D. Increase the exit temperature without any effect on mass flow rate
Answer : C
A. Decrease the mass flow rate and to increase the wetness of steam
B. Increase the mass flow rate and to increase the exit temperature
C. Decrease the mass flow rate and to decrease the wetness of steam
D. Increase the exit temperature without any effect on mass flow rate
Answer : C
9. The difference of supersaturated temperature and saturation temperature at that pressure is called
A. Degree of super-saturation
B. Degree of superheat
C. Degree of under-cooling
D. None of these
Answer : C
A. Degree of super-saturation
B. Degree of superheat
C. Degree of under-cooling
D. None of these
Answer : C
10. The diameter of Cornish boiler is of the order of
A. 12 m
B. 1.52.5 m
C. 23 m
D. 2.53.5 m
Answer : A
A. 12 m
B. 1.52.5 m
C. 23 m
D. 2.53.5 m
Answer : A
11. On Millier chart, the constant pressure lines
A. Diverge from left to right
B. Diverge from right to left
C. Are equally spaced throughout
D. First rise up and then fall
Answer : A
A. Diverge from left to right
B. Diverge from right to left
C. Are equally spaced throughout
D. First rise up and then fall
Answer : A
12. In water wall furnace, the heat is transferred to the water walls by
A. Convection
B. Radiation
C. Conduction
D. Radiation and conduction
Answer : B
A. Convection
B. Radiation
C. Conduction
D. Radiation and conduction
Answer : B
13. The ultimate analysis of fuel lists
A. Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
B. Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
C. Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
D. Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Answer : B
A. Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
B. Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
C. Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
D. Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Answer : B
14. Which of the following statement is correct?
A. A horizontal steam engine requires less floor area than a vertical steam engine
B. The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure
C. The compound steam engines are generally non-condensing steam engines
D. All of the above
Answer : B
A. A horizontal steam engine requires less floor area than a vertical steam engine
B. The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure
C. The compound steam engines are generally non-condensing steam engines
D. All of the above
Answer : B
15. Locomotive boiler is a
A. Single tube, horizontal, internally fired and stationary boiler
B. Single tube, vertical, externally fired and stationary boiler
C. Multi-tubular, horizontal, internally fired and mobile boiler
D. Multi-tubular, horizontal, externally fired and stationary boiler
Answer : C
A. Single tube, horizontal, internally fired and stationary boiler
B. Single tube, vertical, externally fired and stationary boiler
C. Multi-tubular, horizontal, internally fired and mobile boiler
D. Multi-tubular, horizontal, externally fired and stationary boiler
Answer : C
16. By compounding the expansion of steam in two or more cylinders, the length of stroke
A. Does not change
B. Increases
C. Decreases
D. None of these
Answer : C
A. Does not change
B. Increases
C. Decreases
D. None of these
Answer : C
17. Efficiency of a thermal cycle increases by
A. Regeneration
B. Reheating of steam
C. Both (A) and (B)
D. Cooling of steam
Answer : C
A. Regeneration
B. Reheating of steam
C. Both (A) and (B)
D. Cooling of steam
Answer : C
18. The diameter of flue tube in a Cornish boiler is _________ that of the shell.
A. One-fourth
B. One-third
C. Two-fifth
D. Three-fifth
Answer : D
A. One-fourth
B. One-third
C. Two-fifth
D. Three-fifth
Answer : D
19. 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 : B
A. Blow off cock
B. Fusible plug
C. Stop valve
D. Safety valve
Answer : B
20. 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. Feed pump
B. Injector
C. Feed check valve
D. Pressure gauge
Answer : A
A. Feed pump
B. Injector
C. Feed check valve
D. Pressure gauge
Answer : A
21. The impulse reaction turbine has its driving force
A. As an impulsive force
B. As a reaction force
C. Partly as an impulsive force and partly as a reaction force
D. None of the above
Answer : C
A. As an impulsive force
B. As a reaction force
C. Partly as an impulsive force and partly as a reaction force
D. None of the above
Answer : C
22. The efficiency of the plant __________ with the mechanical draught.
A. Increases
B. Decreases
C. Remains constant
D. None of these
Answer : A
A. Increases
B. Decreases
C. Remains constant
D. None of these
Answer : A
23. The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.
A. More
B. Less
C. Equal
D. None of these
Answer : B
A. More
B. Less
C. Equal
D. None of these
Answer : B
24. 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 : C
A. Equal to
B. Lower than
C. Higher than
D. None of these
Answer : C
25. The number of flue tubes in Lancashire boiler is
A. Zero
B. One
C. Two
D. Four
Answer : C
A. Zero
B. One
C. Two
D. Four
Answer : C
26. While steam expands in turbines, theoretically the entropy
A. Remains constant
B. Increases
C. Decreases
D. Behaves unpredictably
Answer : A
A. Remains constant
B. Increases
C. Decreases
D. Behaves unpredictably
Answer : A
27. The fire tubes in, a Coarran and Scottish marine boiler are
A. Horizontal
B. Vertical
C. Inclined
D. Both horizontal and vertical
Answer : A
A. Horizontal
B. Vertical
C. Inclined
D. Both horizontal and vertical
Answer : A
28. The high pressure boiler is one, which produces steam at a pressure more than
A. Atmospheric pressure
B. 5 kg/cm²
C. 10 kg/cm²
D. 7580 kg/cm²
Answer : D
A. Atmospheric pressure
B. 5 kg/cm²
C. 10 kg/cm²
D. 7580 kg/cm²
Answer : D
29. The main object of a boiler trial is
A. To determine the generating capacity of the boiler
B. To determine the thermal efficiency of the boiler when working at a definite pressure
C. To prepare heat balance sheet for the boiler
D. All of the above
Answer : D
A. To determine the generating capacity of the boiler
B. To determine the thermal efficiency of the boiler when working at a definite pressure
C. To prepare heat balance sheet for the boiler
D. All of the above
Answer : D
30. The number of drums in Benson steam generator is
A. One
B. Two
C. One steam drum and one water drum
D. No drum
Answer : D
A. One
B. Two
C. One steam drum and one water drum
D. No drum
Answer : D
31. If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to
A. ps - pa
B. pa - ps
C. pa + ps
D. None of these
Answer : C
A. ps - pa
B. pa - ps
C. pa + ps
D. None of these
Answer : C
32. The pressure at which latent heat of vaporisation of water is zero, is
A. Below atmospheric pressure
B. 1 kg/cm²
C. 100 kg/cm²
D. 225.6 kg/cm²
Answer : D
A. Below atmospheric pressure
B. 1 kg/cm²
C. 100 kg/cm²
D. 225.6 kg/cm²
Answer : D
33. 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 : B
A. Efficiency of the boiler
B. Efficiency of the chimney
C. Efficiency of the fan
D. Power of the boiler
Answer : B
34. 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
Answer : C
A. 5 to 6 m
B. 6 to 7 m
C. 7.25 to 9 m
D. 9 to 10 m
Answer : C
35. 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. Receiver type compound engine
B. Tandem type compound engine
C. Woolf type compound engine
D. Both (A) and (B)
Answer : C
A. Receiver type compound engine
B. Tandem type compound engine
C. Woolf type compound engine
D. Both (A) and (B)
Answer : C
36. Ultimate analysis of fuel is determination of percentage of
A. Carbon, hydrogen, nitrogen, sulphur, moisture
B. Fixed carbon, ash, volatile matter, moisture
C. Higher calorific value
D. Lower calorific value
Answer : A
A. Carbon, hydrogen, nitrogen, sulphur, moisture
B. Fixed carbon, ash, volatile matter, moisture
C. Higher calorific value
D. Lower calorific value
Answer : A
37. A fusible plug is fitted in small boilers in order to
A. Avoid excessive build up of pressure
B. Avoid explosion
C. Extinguish fire if water level in the boiler falls below alarming limit
D. Control steam dome
Answer : C
A. Avoid excessive build up of pressure
B. Avoid explosion
C. Extinguish fire if water level in the boiler falls below alarming limit
D. Control steam dome
Answer : C
38. Expansion ratio is the ratio of
A. Swept volume to the volume at cut-off
B. Clearance volume to the swept volume
C. Volume at cut-off to the swept volume
D. Swept volume to the clearance volume
Answer : A
A. Swept volume to the volume at cut-off
B. Clearance volume to the swept volume
C. Volume at cut-off to the swept volume
D. Swept volume to the clearance volume
Answer : A
39. The diameters of fire tubes and superheater tubes in locomotive boiler are
A. 47.5 mm, 130 mm
B. 32.5 mm, 180 mm
C. 65.5 mm, 210 mm
D. 24.5 mm, 65 mm
Answer : A
A. 47.5 mm, 130 mm
B. 32.5 mm, 180 mm
C. 65.5 mm, 210 mm
D. 24.5 mm, 65 mm
Answer : A
40. 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 : A
A. Piston rod
B. Connecting rod
C. Eccentric rod
D. Valve rod
Answer : A
41. A closed vessel made of steel and used for the generation of steam is called a
A. Steam boiler
B. Steam turbine
C. Steam condenser D. Steam injector
Answer : A
A. Steam boiler
B. Steam turbine
C. Steam condenser D. Steam injector
Answer : A
42. The expansion of steam, as it flows over the blades in reaction turbine, represents
A. Isothermal process
B. Isentropic process
C. Throttling process
D. Free expansion process
Answer : B
A. Isothermal process
B. Isentropic process
C. Throttling process
D. Free expansion process
Answer : B
43. Which of the following statement is wrong?
A. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
B. The flow in the convergent portion of the nozzle is subsonic.
C. The flow in the divergent portion of the nozzle is supersonic.
D. To increase the velocity of steam above sonic velocity (supersonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary.
Answer : D
A. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
B. The flow in the convergent portion of the nozzle is subsonic.
C. The flow in the divergent portion of the nozzle is supersonic.
D. To increase the velocity of steam above sonic velocity (supersonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary.
Answer : D
44. One kilowatt-hour energy is equivalent to
A. 1000 J
B. 360 kJ
C. 3600 kJ
D. 3600 kW/sec
Answer : C
A. 1000 J
B. 360 kJ
C. 3600 kJ
D. 3600 kW/sec
Answer : C
45. 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
Answer : C
A. Slow speed engine
B. Vertical steam engine
C. Condensing steam engine
D. Non-condensing steam engine
Answer : C
46. The diagram efficiency is the ratio of
A. Workdone on the blades to the energy supplied to the blades
B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
D. None of the above
Answer : A
A. Workdone on the blades to the energy supplied to the blades
B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
D. None of the above
Answer : A
47. 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 : B
A. 1.05
B. 2.86
C. 6.65
D. 10.05
Answer : B
48. The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
A. Condenser efficiency
B. Vacuum efficiency
C. Nozzle efficiency
D. Boiler efficiency
Answer : A
A. Condenser efficiency
B. Vacuum efficiency
C. Nozzle efficiency
D. Boiler efficiency
Answer : A
49. Willians line follows the law (where b = A constant representing the shape of the Willians 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 × m + b
B. m = a + b × I.P.
C. I.P. = b × m + a
D. m = (b/I.P.) - a
Answer : B
A. I.P. = a × m + b
B. m = a + b × I.P.
C. I.P. = b × m + a
D. m = (b/I.P.) - a
Answer : B
50. The efficiency of reaction turbine is maximum when (where ? = Angle made by the absolute velocity V at inlet)
A. Vb = 0.5 V cos?
B. Vb = V cos ?
C. Vb = 0.5 V² cos?
D. Vb = V² cos?
Answer : B
A. Vb = 0.5 V cos?
B. Vb = V cos ?
C. Vb = 0.5 V² cos?
D. Vb = V² cos?
Answer : B
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