Power Plant Engineering

91. The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is

1. 0.555
2. 0.578
3. 0.5457
4. 0.6

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92. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is

1. higher
2. lower
3. same as long as initial pressure and temperature is unchanged
4. none of the above

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93. The value of reheat factor normally varies from (a) 0.5 to 0.6

1. 0.9 to 0.95
2. 1.02 to 1.06
3. 1.2 to 1.6
4. all of the above

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94. The value of the reheat factor is of the order of

1. 0.8 to 1.0
2. 1.0 to 1.05
3. 1.1 to 1.5
4. above 1.5

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95. Thorium Breeder Reactors are most suitable for India because

1. these develop more power
2. its technology is simple
3. abundance of thorium deposits are available in India
4. these can be easily designed

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96. TravelUng grate stoker can burn coals at the rates of

1. 50—75 kg/m per hour
2. 75—100 kg/m per hour
3. 100—150 kg/m per hour
4. 150—200 kg/m2 per hour

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97. Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency

1. anthracite
2. lignite
3. semibituminous and bituminous
4. all of the above

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98. Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is

1. underfeed stoker
2. overfeed stoker
3. any
4. none of the above

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