Compressors, Gas Turbines and Jet Engines
The work ratio of a gas turbine plant is defined as the ratio of

Net work output and isentropic heat drop
Net work output and work done by turbine
Actual heat drop and isentropic heat drop
Net work output and heat supplied

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Compressors, Gas Turbines and Jet Engines
In the cross compounding of the gas turbine plant

All are connected in series
H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine
Both the arrangements can be employed

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

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