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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The pressure ratio of an ideal vaned compressor with increase in mass flow rate

Decreases
Increases
First decreases and then increases
Remain constant

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Compressors, Gas Turbines and Jet Engines
Actual compression curve is

Same as isothermal
Same as adiabatic
In between isothermal and adiabatic
Better than isothermal and adiabatic

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Compressors, Gas Turbines and Jet Engines
Gas turbine blades are given a rake

In the direction of motion of blades
Depending on the velocity
Equal to zero
Opposite to the direction of motion of blades

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Compressors, Gas Turbines and Jet Engines
For minimum work required to compress and deliver a quantity of air by multistage compression

The intercooling should be perfect
The compression ratio in each stage should be same
The work-done in each stage should be same
All of the listed here

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Compressors, Gas Turbines and Jet Engines
The absolute pressure of air at the outlet of a compressor is called

Discharge pressure
None of the listed here
Back pressure
Critical pressure

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Compressors, Gas Turbines and Jet Engines
The ratio of isentropic work to Euler’s work is known as

Isentropic efficiency
Pressure coefficient
Euler
Compressor efficiency

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