Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor without clearance volume

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

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Compressors, Gas Turbines and Jet Engines
Which one of the following is the effect of blade shape on performance of a centrifugal compressor?

Forward curved blades has higher efficiency
Backward curved blades lead to stable performance
Backward curved blades has poor efficiency
Forward curved blades produce lower pressure ratio

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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
Partial combustion of coal, eke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke

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