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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

(W₁ + W₂)/W₁
W₁/(W₁ + W₂)
(W₁ + W₂)/W₂
W₂/(W₁ + W₂)

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Compressors, Gas Turbines and Jet Engines
The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called

None of these
Velocity coefficient
Slip factor
Velocity factor

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Compressors, Gas Turbines and Jet Engines
Free air is the air at

Atmospheric conditions at any specific location
0°C and standard atmospheric conditions
20°C and 1 kg/cm² and relative humidity of 36%
15°C and 1 kg/cm²

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Compressors, Gas Turbines and Jet Engines
In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ________ of the piston.

Two strokes
Four strokes
One stroke
Three strokes

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Compressors, Gas Turbines and Jet Engines
Reheating in a gas turbine

Increases the thermal efficiency
Increases the compressor work
Decreases the thermal efficiency
Increases the turbine work

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Compressors, Gas Turbines and Jet Engines
1 m of air at atmospheric condition weighs approximately

1.0 kg
1.3 kg
2.2 kg
0.5 kg

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