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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
A rocket engine uses __________ for the combustion of its fuel.

Surrounding air
Compressed atmospheric air
Its own oxygen
None of these

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Compressors, Gas Turbines and Jet Engines
Pick up the wrong statement about advantages of multistage compression

Air can be cooled perfectly in between
More loss of air due to leakage past the cylinder
Mechanical balance is better
Better lubrication is possible advantages of multistage

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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) n-1/n
1 + k - k (p₂/p₁)1/n

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Compressors, Gas Turbines and Jet Engines
For supplying intermittent small quantity of air at high pressure, following compressor is best suited

Reciprocating
Centrifugal
Axial
Screw

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

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

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

Petrol engine
C. electric motor
Diesel engine
Compressed air

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