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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The air is delivered ________ in one revolution in case of a three lobbed rotor.

Six times
Two times
Three times
Four times

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Compressors, Gas Turbines and Jet Engines
The volume of air delivered in a medium capacity air compressor per unit time is

0.1 to 1.2 m³/s
0.15 to 5 m³/s
Above 5 m³/s
None of these

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Compressors, Gas Turbines and Jet Engines
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as

Compressor efficiency
Volumetric efficiency
Isothermal efficiency
Mechanical efficiency

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

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

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Compressors, Gas Turbines and Jet Engines
The criterion of the thermodynamic efficiency for rotary compressor is

Polytropic compression
Isothermal compression
Isentropic compression
None of the listed here

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

C. electric motor
Compressed air
Petrol engine
Diesel engine

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