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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The stagnation pressure rise in a centrifugal compressor takes place

In the inlet guide vanes only
In the impeller only
In the diffuser only
In the diffuser and impeller

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Compressors, Gas Turbines and Jet Engines
A gas turbine used in air craft should have

High h.p. and low weight
Low weight and small frontal area
Small frontal area and high h.p.
High speed and high h.p.

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

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

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency is

Reciprocal of compression ratio
The ratio of the air actually delivered to the amount of piston displacement
Index of compressor performance
The ratio of stroke volume to clearance volume

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Compressors, Gas Turbines and Jet Engines
The power available for takeoff and climb in case of turbojet engine as compared to reciprocating engine is

More
Less
May be less or more depending on ambient conditions
Same

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Compressors, Gas Turbines and Jet Engines
Phenomenon of choking in compressor means

No flow of air
Increased inclination of chord with air steam
Fixed mass flow rate regardless of pressure ratio
Reducing mass flow rate with increase in pressure ratio

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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