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
Equal to
Greater than
None of these

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Compressors, Gas Turbines and Jet Engines
Producer gas is produced by

Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing air and a large amount of steam over waste coal at about 65°C
Passing steam over incandescent coke
Carbonisation of coal

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Compressors, Gas Turbines and Jet Engines
Intercooling in gas turbines

Decreases net output but increases thermal efficiency
Decreases net output and thermal efficiency both
Increases net output but decreases thermal efficiency
Increases net output and thermal efficiency both

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Isothermal h.p. to the BHP of motor
Work to compress air isothermally to work for actual compression
Power to drive compressor to isothermal h.p.
Isothermal h.p. to adiabatic h.p.

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