steam boilers engines nozzles and turbines MCQs – Page 3

Practise focused steam boilers engines nozzles and turbines questions with marked answers for exam preparation and subject revision.

steam boilers engines nozzles and turbines Mcqs

41. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?
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A. wet

B. none of the above

C. superheated

D. remain dry satruated

E. dry

42. The increase in pressure _________________?
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A. raises the boiling point of a liquid

B. lowers the boiling point of a liquid

C. none of the above

D. .does not affect the boiling point of a liquid

E. reduces its volume

43. Which of the following substance will have same percentage in both proximate and ultimate analysis___________________?
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A. ash

B. volatile matter

C. moisture

D. hydrogen

E. none of the above

44. The basic purpose of drum in boiler is to_____________________?
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A. serve as storage of feed water for water wall

B. control level

C. serve as storage of steam

D. remove salts from water

E. separate steam from water

45. While steam expands in turbines, theoretically the entropy________________?
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A. decreases

B. remains constant

C. none of the above

D. increases

E. behaves unpredictably

46. For burning 1 kg of carbon to CO as per chemically correct combusiton, amount of air required is___________________?
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A. 8/3kg

B. 2 kg

C. 4/3kg

D. 1 kg

E. 16/3 kg

47. In locomotive boiler, maximum steam pressure is limited to_______________?
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A. 31 kg/cm2

B. 1 kg/cm2

C. 18 kg/cm2

D. 5 kg/cm2

E. 10 kg/cm2

48. The high pressure boiler is oiie producing steam at a pressure more than_________________?
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A. 5 kg/cm2

B. 75-80 kg/cm2

C. 10 kg/cm2

D. 40 kg/cm2

E. atmospheric pressure

49. Sublimation region is the region where__________________?
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A. solid and vapour phases are in equi-librium

B. liquid and vapour phases are in equilibrium

C. solid, liquid and vapour phases are in equilibrium

D. none of the above

E. solid and liquid phases are in equilibrium

50. Equivalent evaporation is the amount of water evaporated in a boiler from and at ____________________?
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A. room temperature

B. 100C

C. saturation temperature at given pressure

D. 0C

E. 20C

51. Which of the following boilers is best suited to meet fluctuating demands___________________?
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A. cochran

B. lancashire

C. locomotive

D. babcock and wilcox

E. comish

52. Equivalent evaporation of water is the evaporation for a feed water supply at 100C__________________?
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A. and its corresponding conversion into dry steam at desired boiler pressure

B. and its corresponding conversion into dry saturated steam at 100C and 1.033 kg/cm2

C. conversion into steam at the same pres-sure at which feed water is supplied

D. conversion into steam at atmospheric condition

E. none of the above

53. Locomotive type boiler is__________________?
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A. water wall enclosed furnace type

B. horizontal multi-tubular fire tube type

C. vertical tubular fire tube type

D. none of the above types

E. horizontal multitubular water tube boiler

54. Steam engine operates on_________________?
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A. Stirling cycle

B. brayton cycle

C. carnot cycle

D. joule cycle

E. none of the above

55. One kilowatt-hour energy is equivalent to ________________?
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A. 1000 J

B. 3600 kW/sec

C. 3600 kJ

D. 360 kJ

E. 1000 kJ

56. The critical pressure at which latent heat of vaporisation is zero is________________?
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A. 1 kgf/cm2

B. 1 kgf/cm2

C. 100 kgf/cm2

D. 273 kgf/cm2

E. 225.65 kgf/cm2

57. The diameter of cylindrical shell of the Lancashire boiler is of the order of__________________?
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A. 1.75 to 2.75 m

B. 2.25 to 4.5 m

C. 2 to 4 m

D. 1 to 1.75 m

E. 1 tp 1.25m

58. The lenght of Cornish boiler is of the order of _________________?
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A. 5-7.5 m

B. 3-5 m

C. 7-9 m

D. 2-4 m

E. 9-11 m

59. Duplex feed pumps are used in small steam boilers. These operate on the principle of_________________?
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A. axial flow pump

B. gear pump

C. reciprocating pump

D. ejector pump

E. centrifugal pump

60. In natural circulation type boiler _______________?
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A. feed pump is employed to supplement natural circulation in water wall type furnace

B. water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam

C. water is fed at atmospheric pressure

D. water is converted into steam in one . pass without any recirculation

E. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

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