Compressors, Gas Turbines and Jet Engines
For an irreversible gas turbine cycle, the efficiency and work ratio both depend on

Both pressure ratio and maximum cycle temperature
Pressure ratio alone
Maximum cycle temperature alone
Minimum cycle temperature alone

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

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

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