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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Water is injected in gas turbine cycle to

Control fire hazards
Control temperature
Control output of turbine
Increase efficiency

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Compressors, Gas Turbines and Jet Engines
Gas turbines for power generation are normally used

To supply peak load requirements
To enable start thermal power plant
To supply base load requirements
In emergency

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Compressors, Gas Turbines and Jet Engines
The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

Volumetric efficiency
Compressor efficiency
Mechanical efficiency
Isothermal efficiency

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

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

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Compressors, Gas Turbines and Jet Engines
Work ratio of a gas turbine may be improved by

Decreasing the compression work
Both (A) and (C) above
Increasing the compression work
Increasing the turbine work

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Compressors, Gas Turbines and Jet Engines
As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio

First increases and then decreases
Decreases
Increases
Remain same

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