Steam Boilers, Engines, Nozzles & Turbines 1000+ MCQ with answer for CEED

1. A safety valve in a locomotive starts leaking. The leaking medium will be
A. Water
B. Dry steam
C. Wet steam
D. Super heated steam
Answer : D

2. In designing air preheaters, the important design consideration is that
A. Approach temperature should be as low as possible
B. Handling and maintenance should be easier
C. Heat transfer area should be optimum
D. Stack gases should not be cooled to the dew point
Answer : D

3. 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

4. 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 : A

5. In a reaction turbine when the degree of reaction is zero, then there is
A. No heat drop in moving blades
B. No heat drop in fixed blades
C. Maximum heat drop in moving blades
D. Maximum heat drop in fixed blades
Answer : A

6. The diameter of a cylindrical shell of a Scotch marine boiler varies from
A. 1.5 to 2 m
B. 2.5 to 3.5 m
C. 3.5 to 4.5 m
D. None of these
Answer : B

7. Orsat meter is used for
A. Gravimetric analysis of the flue gases
B. Volumetric analysis of the flue gases
C. Mass flow of the flue gases
D. Measuring smoke density of flue gases
Answer : B

8. Cut-off ratio is the ratio of
A. Swept volume to the volume at cut-off
B. Volume at cut-off to the clearance volume
C. Volume at cut-off to the swept volume
D. Clearance volume to the volume at cut-off
Answer : C

9. In a Woolf type compound engine, the high pressure and low pressure cylinders
A. Have common piston rod
B. Are set at 90°
C. Have separate piston rod
D. Are set in V-arrangement
Answer : C

10. 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

11. Equivalent evaporation is the amount of water evaporated in a boiler from and at
A. 0°C
B. 100°C
C. Saturation temperature at given pressure
D. Room temperature
Answer : B

12. 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 : D

13. In a throttling process
A. Steam temperature remains constant
B. Steam pressure remains constant
C. Steam enthalpy remains constant
D. Steam entropy remains constant
Answer : C

14. The fittings mounted on the boiler for its proper and safe functioning is a
A. Water level indicator
B. Pressure gauge
C. Safety valve
D. All of these
Answer : D

15. The reheat factor depends upon
A. Initial pressure and superheat
B. Exit pressure
C. Turbine stage efficiency
D. All of these
Answer : D

16. Which of the following coals has the highest calorific value?
A. Anthracite coal
B. Bituminous coal
C. Lignite
D. Peat
Answer : A

17. In a nozzle, the effect of super-saturation is to
A. Decrease dryness fraction of steam
B. Decrease specific volume of steam
C. Increase the entropy
D. Increase the heat drop
Answer : C

18. The natural draught is produced by
A. Steam jet
B. Centrifugal fan
C. Chimney
D. Both (A) and (B)
Answer : C

19. The working pressure range for a LaMont 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 : D

20. 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

21. The coal requirement per kW hour generation in the thermal power plant is of the order of
A. 0.1 to 0.2 kg
B. 0.2 to 0.4 kg
C. 0.6 to 0.8 kg
D. 1.0 to 1.5 kg
Answer : C

22. Which of the following is a fire tube boiler?
A. Locomotive boiler
B. Babcock and Wilcox boiler
C. Stirling boiler
D. All of the above
Answer : A

23. 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

24. A binary vapour plant consists of
A. Steam turbine
B. Steam condenser
C. Mercury boiler
D. All of these
Answer : D

25. The capacity of induced draft fan compared to forced draft fan in a boiler is
A. Same
B. More
C. Less
D. Less or more depending on size of boiler
Answer : B

26. The reheat factor is the ratio of the
A. Cumulative heat drop to the isentropic heat drop
B. Isentropic heat drop to the heat supplied
C. Total useful heat drop to the total isentropic heat drop
D. None of the above
Answer : A

27. The effect of friction in the nozzle __________ dryness fraction of steam.
A. Has no effect on
B. Decreases
C. Increases
D. None of these
Answer : C

28. Desecration of feed water is carried out because it reduces
A. Cavitation of boiler feed pumps
B. Corrosion caused by oxygen
C. Heat transfer coefficient
D. pH value of water
Answer : B

29. 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

30. 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

31. The flow through a nozzle is regarded as
A. Constant volume flow
B. Constant pressure flow
C. Isothermal flow
D. Isentropic flow
Answer : D

32. 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

33. The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and h_d = Enthalpy or heat drop during expansion of steam in a nozzle)
A. V = 44.72 h_d K
B. V = 44.72 K h_d
C. V = 44.72 K h_d
D. V = 44.72 K h_d
Answer : C

34. The temperature of flue gases at air heater outlet should be
A. 100°C
B. Above dew point temperature of flue gases
C. Below dew point temperature of flue gases
D. Less than wet bulb temperature of flue gases
Answer : B

35. The velocity of steam at throat of the nozzle is __________ the velocity of sound.
A. Equal to
B. Less than
C. More than
D. None of these
Answer : A

36. Steam turbines may be classified according to
A. Direction of steam flow
B. Number of stages
C. Mode of steam action
D. All of these
Answer : D

37. In a uniflow engine
A. Steam enters and exhausts through the same port
B. Steam enters at one end and exhausts at the centre
C. Steam enters at the centre and exhausts at the other end
D. None of the above
Answer : B

38. Proximate 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 : B

39. 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

40. The average operating pressure of Benson boiler is
A. 100 bar
B. 150 bar
C. 200 bar
D. 250 bar
Answer : D

41. In cross compounding, the cylinders are arranged
A. Side by side and each cylinder has common piston, connecting rod and crank
B. Side by side and each cylinder has separate piston, connecting rod and crank
C. At 90° and each cylinder has common piston, connecting rod and crank
D. At 90° and each cylinder has separate piston, connecting rod and crank
Answer : B

42. 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

43. Which of the following gases has the highest calorific value?
A. Producer gas
B. Coal gas
C. Water gas
D. Blast furnace gas
Answer : B

44. The economiser is used in boilers to
A. Increase thermal efficiency of boiler
B. Economise on fuel
C. Extract heat from the exhaust flue gases
D. Increase flue gas temperature
Answer : A

45. Cochran boiler is a
A. Horizontal fire tube boiler
B. Horizontal water tube boiler
C. Vertical water tube boiler
D. Vertical fire tube boiler
Answer : D

46. The high steam and low water safety valve is used to blow off steam when the
A. Steam pressure exceeds the working pressure
B. Water level in the boiler becomes too low
C. Both (A) and (B)
D. None of the above
Answer : C

47. An economiser is generally placed between
A. Last superheater or reheater and air preheater
B. Induced draft fan and forced draft fan
C. Air preheater and chimney
D. None of the above
Answer : A

48. The rate of steam produced in Benson boiler is
A. 100 tonnes/h
B. 135 tonnes/h
C. 175 tonnes/h
D. 250 tonnes/h
Answer : B

49. The number of water level indicators in a boiler are generally _________ in number.
A. One
B. Two
C. Three
D. Four
Answer : B

50. 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