steam boilers engines nozzles and turbines MCQs – Page 4

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
61. Which of the following coals has the highest calorific value_________________?
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A. wood

B. anthracite coal

C. lignite

D. peat

E. bituminous coal

62. Hygrometery deals with the_________________?
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A. density measurement

B. pressure of air

C. temperature of air

D. water vapour in air

E. Hygroscopic substances

63. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is_________________?
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A. one-half

B. one-fourth

C. one-third

D. two-fifth

E. one-fifth

64. If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Daltons law, the pressure in condenser is equal to__________________?
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A. Pa+P

B. Ps-Pa

C. pa-ps

D. non of these

65. The evaporation of 15.653 kg of water per hour from and at 100C is called_________________?
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A. evaporative capacity

B. equivalent evaporation

C. factor of evaporation

D. one boiler h.p.

E. boiler efficiency

66. A wet vapour can be completely specified by__________________?
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A. pressure only

B. specific volume only

C. dryness fraction only

D. temperature only

E. pressure and dryness fraction
67. Adiabatic process is________________?
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A. constant enthalpy process

B. reversible process

C. non-heat transfer process

D. essentially an isentropic process

E. constant temperature process

68. The number of flue tubes in Lancashire boiler is_________________?
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A. two

B. one

C. many

D. zero

E. four

69. Cochran boiler is a__________________?
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A. horizontal water-tube boiler

B. forced circulating boiler

C. horizontal fire-tube boiler

D. vertical fire tube boiler

E. veritcal water-tube boiler

70. Water tube boilers are those in which________________?
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A. none of the above

B. change in enthalpy

C. water passes through the tubes and flue gases around it

D. flue gases pass through tubes and water around it

E. work is done during adiabatic expansion
71. One kg of steam sample contains 0.8 kg dry steam; its dryness fraction is__________________?
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A. 0.8

B. 0.2

C. 0.6

D. 1

E. 0.5

72. Which of the following is a fire tube boiler________________?
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A. all of the above

B. Babcock and Wilcox boiler

C. locomotive boiler

D. none of the above

E. Stirling boiler.

73. At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?
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A. minimum

B. none of the above

C. zero

D. depends on temperature also

E. maximum

74. 1 kg.m is equal to_________________?
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A. All Joules

B. 102 Joules

C. 9.81 Joules

D. 427 Joules

E. 539 Joules

75. Locomotive boiler is of the following type__________________?
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A. horizontal

B. internally fired

C. multitubular

D. all of the above

E. mobile

76. An ideal regenerative cycle is ______________________?
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A. more than carnot cycle

B. less than carnot cycle

C. could be anything

D. none of the above

E. equal to carnot cycle

77. The equivalent evaporation of a boiler is a measure to compare _________________?
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A. the given boiler with the model

B. the two different boilers of the same make

C. two boilers of same make but operaing under different conditions

D. any type of boilers operating under any conditions

E. two different makes of boilers operating under the same operating conditions

78. The change in internal energy in steam engines equals to__________________?
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A. work done during the rankine cycle ;

B. work done during adiabatic expansion

C. change in enthalpy

D. work done during compression.

E. none of the above

79. Orsat meter is used for__________________?
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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

E. none of the above

80. Pick up the wrong statement about critical condition of steam___________________?
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A. all properties of liquid and steam are same

B. specific volume of steam and liquid is same

C. latent heat is zero

D. liquid directly becomes steam

E. this is the maximum pressure limit