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76. The efficiency of Diesel cycle depends upon cut-off ratio and compression ratio (Yes /No)


77. In closed cycle gas turbine, the air is compresses isentropically (True/False)


78. A closed cycle gas turbine works on Joule’s cycle. (True/False)


79. A close cycle gas turbine gives …….. efficiency as compared to an open cycle gas turbine.

a) same b) lower c) higher

80. The principal constituents of a fuel are

  1. a) carbon and hydrogen
  2. b) oxygen and hydrogen
  3. c) sulphur and oxygen
  4. d) sulphur and hydrogen

81. The amount of heat generated per kg of fuel is known as calorific value (True/False)


82. Coke is produced when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closes vessel (Yes/No) : Yes

83. The hard coke is obtained when cabonisation of coal is carried out at 900 to 1100 .C

84. Steam coal is a non-coking bituminous coal.

85. Petrol is distilled at 65 to 220 .C

86. Kerosene is distilled at 220 to 345 .C

87. Which of the following gas has the highest calorific value?

  1. a) coal gas
  2. b) producer gas
  3. c) Mond gas
  4. d) Blast furnace gas

88. The calorific value of gaseous fuel is expressed in kJ/kg. (True)

89. Producer gas is obtained by partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast. (True)

90. The amount of heat given out by the complete combustion of 1 kg of fuel is known as calorific value of solid or liquid fuel. (True/False) : True

91. The bomb calorimeter is used for finding the Higher calorific value of solid and liquid fuels. : True

92. A molecule consisting of one atom is known as monoatomic : True

93. The oxygen atom is ……. times heavier than the hydrogen atom.

a) 2 b) 4 c) 8 d) 16

94. The mass of carbon per kg of fuel gas is given by

11/3 CO2 + 3/7 CO

95. The mass of excess air supplied is equal to 100/23 x Mass of excess oxygen.

96. The atomic mass of nitrogen (14) is less than oxygen (16).

97. The atomic mass of sulphur is

  1. 12
  2. 14
  3. 16
  4. 32

98. One molecule of oxygen consists of 2 atoms of oxygen. (True/False) : True

99. Reheating in a gas turbine increase the thermal efficiency : True

100. The condition for a reversible and irreversible cycle

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