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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁ - v₂)²/g
(v₁ - v₂)²/2g
(v₁² -v₂²)/g
(v₁² -v₂²)/2g

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Compressors, Gas Turbines and Jet Engines
More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

2 kg/cm²
14.7 kg/cm²
10 kg/cm²
6 kg/cm²

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Compressors, Gas Turbines and Jet Engines
Losses in a centrifugal compressor are due to

Diffuser losses
Inlet losses
All of the listed here
Impeller channel losses

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Compressors, Gas Turbines and Jet Engines
A large clearance volume in a reciprocating compressor results in

Reduced volume flow rate
Lower suction pressure
Increased volume flow rate
Lower delivery pressure

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

Cause moisture and oil vapour to drop out
Reduce volume of air
Remove impurities from air
Cool the air

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

High nickel alloy
Carbon steel
Stainless steel
High alloy steel

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