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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Maximum work is done in compressing air when the compression is

Polytropic
Adiabatic
Isothermal
None of these

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

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Compressors, Gas Turbines and Jet Engines
The advantage of multistage compression over single stage compression is

All of these
Decreased discharge temperature
Lower power consumption per unit of air delivered
Higher volumetric efficiency

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Compressors, Gas Turbines and Jet Engines
For perfect intercooling in a three stage compressor

p₃/p₁ = p₄/p₂
p₂/p₁ = p₃/p₂ = p₄/p₃
p₁ p₂ = p₃ p₄
p₁ p₃ = p₂ p₄

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Compressors, Gas Turbines and Jet Engines
Aeroplanes employ following type of compressor

Radial flow
Axial flow
None of these
Centrifugal

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Compressors, Gas Turbines and Jet Engines
The blades of gas turbine are made of

High alloy steel
Stainless steel
High nickel alloy
Carbon steel

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