Compressors, Gas Turbines and Jet Engines
For minimum work required to compress and deliver a quantity of air by multistage compression

All of the listed here
The compression ratio in each stage should be same
The intercooling should be perfect
The work-done in each stage should be same

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

Carbonisation of coal
Passing steam over incandescent coke
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

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