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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.

Outlet whirl velocity
Inlet whirl velocity
Inlet velocity of flow
Outlet velocity of flow

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

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

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Compressors, Gas Turbines and Jet Engines
Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

Lower volumetric efficiency
Better mechanical balance
Less power requirement
Less loss of air due to leakage past the cylinder

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Compressors, Gas Turbines and Jet Engines
Maximum work is done in compressing air when the compression is

Polytropic
None of these
Isothermal
Adiabatic

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Compressors, Gas Turbines and Jet Engines
A closed gas turbine in which fuel is burnt directly in the air is not possible because of

Paucity of O2
High specific volume
High friction losses
Increasing gas temperature

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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

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

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