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Compressors, Gas Turbines and Jet Engines

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

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

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Compressors, Gas Turbines and Jet Engines
In jet engines the products of combustion after passing through the gas turbine are discharged into

Vacuum
Discharge nozzle
Atmosphere
Back to the compressor

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Compressors, Gas Turbines and Jet Engines
The efficiency of a jet engine is higher at

High altitudes
Low speeds
High speeds
Low altitudes

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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

Degree of reaction
Pressure coefficient
Pressure ratio
Slip factor

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Compressors, Gas Turbines and Jet Engines
Which is false statement about multistage compression?

Volumetric efficiency is high
Power consumption per unit of air delivered is low
It is best suited for compression ratios around 7:1
The moisture in air is condensed in the inter-cooler

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Compressors, Gas Turbines and Jet Engines
Axial flow compressor has the following advantage over centrifugal compressor

Larger air handling ability per unit frontal area
Higher pressure ratio per stage
Higher average velocities
Aerofoil blades are used

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