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 steam over incandescent coke
Carbonisation of coal
Passing air and a large amount of steam over waste coal at about 65°C

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Compressors, Gas Turbines and Jet Engines
Inter-cooling in gas turbine results in

Increase in net output but decrease in thermal efficiency
Increase in both thermal efficiency and net output
Increase in thermal efficiency but decrease in net output
Decrease in both thermal efficiency and net output

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Compressors, Gas Turbines and Jet Engines
For minimum work in multistage compression, assuming same index of compression in all stages

Work done in subsequent stages should increase
Work done in first stage should be more
Work done in subsequent stages should decrease
Work done in all stages should be equal

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