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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor decreases with ________ in compression ratio.

Increase
Remain same
Decrease
Does not change

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

Polytropic reaction
Pressure coefficient
Slip factor
Work coefficient

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Compressors, Gas Turbines and Jet Engines
A 3 m³/min compressor means that it

Delivers 3 m³/ min of compressed air
Compresses 3 m³/ min of free air
Delivers 3 m³/ min of compressed air at delivery pressure
Compresses 3 m³/min of standard air

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Compressors, Gas Turbines and Jet Engines
Efficiency of gas turbine is increased by

All of the listed here
Reheating
Inter cooling
Adding a regenerator

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Compressors, Gas Turbines and Jet Engines
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

1 - k + k (p₁/p₂) n- 1/n
1 - k + k (p₁/p₂)1/n
1 + k - k (p₂/p₁)1/n
1 + k - k (p₂/p₁) n-1/n

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Compressors, Gas Turbines and Jet Engines
Mining industry usually employs following motive power

Compressed air
C. electric motor
Diesel engine
Petrol engine

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