Compressors, Gas Turbines and Jet Engines
The thrust of a jet propulsion power unit can be increased by

Injecting ammonia into the combustion chamber
Burning fuel after gas turbine
All of these
Injecting water into the compressor

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

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

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of the compressor is defined as the ratio of

Volume of free air delivery per stroke to the swept volume of the piston
Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
Isentropic power to the power required to drive the compressor

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