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.

Greater than
Less than
Equal to
None of these

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

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

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