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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
After-cooler is used to

Reduce volume
Decrease the delivery temperature for ease in handling
Cool the air
Cause moisture and oil vapour to drop out

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Compressors, Gas Turbines and Jet Engines
The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called

Pressure ratio
Pressure coefficient
Degree of reaction
Slip factor

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Compressors, Gas Turbines and Jet Engines
Turbofan engine employs

Two or more air streams
One air stream
Solid fuel firing
No air stream

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Compressors, Gas Turbines and Jet Engines
The pressure of air at the beginning of the compression stroke is ___ the atmospheric pressure.

Equal to
None of the listed here
Less than
More than

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Compressors, Gas Turbines and Jet Engines
The mass of gas turbine per kW developed is about ________ as that of an I.C. engine.

One sixth
Same
One-half
One fourth

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Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

1 - (1/r) ɣ/ɣ-1
r ɣ-1
1 - (1/r) ɣ-1/ɣ
1 - r ɣ-1

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