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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Double
Three times
Equal to
Six times

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Compressors, Gas Turbines and Jet Engines
The work-done on a compressor will be minimum if air is taken from

A source of high temperature air
The atmosphere
A source of low temperature air
A source at 0° C

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Compressors, Gas Turbines and Jet Engines
The indicated work per unit mass of air delivered is

Greatly affected by clearance volume
Inversely proportional to clearance volume
Not affected by clearance volume
Directly proportional to clearance volume

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Compressors, Gas Turbines and Jet Engines
Rotary compressors are used for delivering

Large quantities of air at high pressures
Small quantities of air at low pressures
Large quantities of air at low pressures
Small quantities of air at high pressures

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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
For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

Increase
Decrease
Other factors control it
Remain unaffected

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