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Compressors, Gas Turbines and Jet Engines

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

Volumetric efficiency
Compressor efficiency
Isothermal efficiency
Mechanical efficiency

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

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

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

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Compressors, Gas Turbines and Jet Engines
For slow speed large capacity compressor, following type of valve will be best suited

Mechanical valve of the Corliss, sleeve, rotary or semi rotary type
Disc or feather type
Any of the above
Poppet valve

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Compressors, Gas Turbines and Jet Engines
Water is injected in gas turbine cycle to

Control temperature
Control fire hazards
Control output of turbine
Increase efficiency

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Compressors, Gas Turbines and Jet Engines
High air-fuel ratio in gas turbines

Improves thermal efficiency
Do not damage turbine blades
Reduces exhaust temperature
Increases power output

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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