Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor with clearance volume

Decreases with increase in compression ratio
Increases with increase in compression ratio
In not dependent upon compression ratio
May increase/decrease depending on compressor capacity

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

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

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