Compressors

111. The capacity of compressor will be highest when its intake temperature is

1. lowest
2. highest
3. anything.
4. atmospheric
5. none of the above.

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112. The clearance volume of the air compressor is kept minimum because

1. it allows maximum compression to be achieved
2. it greatly affects volumetric efficiency
3. it results in minimum work
4. it permits isothermal compression
5. none of the above.

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113. The closed cycle in gas turbines

1. provides greater flexibility
2. provides lesser flexibility
3. in never used
4. is used when gas is to be burnt
5. none of the above.

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114. The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

1. 50%
2. 75%
3. 85%
4. 90%
5. 99%.

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115. The compression ratio in a gas turbine is of the roder of

1. 3.5 : 1
2. 05:01
3. 08:01
4. 12:01
5. 20:01

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116. The compression ratio in a jet engine varies proportional to

1. speed
2. speed
3. altitude
4. Vspeed
5. does not Vary.

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117. The compressor capacity with decrease in suction temperature

1. increases
2. decreases
3. remains unaffected
4. may increase or decrease depending on compressor capacity
5. increases upto certain limit and then decreases.

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118. The compressor efficiecny is the

1. isothermal H.P/indicated H.R
2. isothermal H.P./shaft H.R
3. total output/air input
4. compression work/motor input
5. none Of the above.

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119. The compressor performance at higher altitude compared to sea level will be

1. same
2. higher
3. lower
4. dependent on other factors
5. none of the above.

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120. The criterion of the thermodynamic efficiency for rotary compressor is

1. isentropic compression
2. isothermal compression
3. polytropic compression
4. any one of the above
5. none of the above.

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