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

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

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Compressors, Gas Turbines and Jet Engines
Choose the correct statement

Gas turbine requires lot of cooling water
Gas turbine is capable of rapid start up and loading
Gas turbines have high standby losses and require lot of maintenance
Gas turbines has flat efficiency at part loads

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