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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Air-fuel ratio in a jet engine will be of the order of

0.41736111111111
2.5006944444444
0.62569444444444
0.83402777777778

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Compressors, Gas Turbines and Jet Engines
Ratio of indicated h.p. to shaft h.p. in known as

Volumetric efficiency
Isothermal efficiency
Mechanical efficiency
Compressor efficiency

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Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor, without clearance, the work-done on the air during isentropic compression is ________ the heat required to raise the temperature of air from T₁ to T₂ at a constant pressure.

Less than
None of these
Equal to
Greater than

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Compressors, Gas Turbines and Jet Engines
The fuel consumption in gas turbines is accounted for by

Higher calorific value
Lower heating value
Higher heating value
Heating value

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Compressors, Gas Turbines and Jet Engines
Propulsive efficiency is defined as ratio of

Thrust power and fuel energy
Engine output and propulsive power
Propulsive power and fuel input
Thrust power and propulsive power

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Compressors, Gas Turbines and Jet Engines
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

1 - k + k (p₁/p₂)1/n
1 + k - k (p₂/p₁)1/n
1 + k - k (p₂/p₁) n-1/n
1 - k + k (p₁/p₂) n- 1/n

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