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Compressors, Gas Turbines and Jet Engines

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

To increase the efficiency
To increase the output
To save fuel
To reduce the exit temperature

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor decreases with ________ in compression ratio.

Increase
Does not change
Remain same
Decrease

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Compressors, Gas Turbines and Jet Engines
Only rocket engines can be propelled to space because

They are not air breathing engines
They can generate very high thrust
They have high propulsion efficiency
These engines can work on several fuels

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Compressors, Gas Turbines and Jet Engines
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

1 - k + k (p₁/p₂)1/n
1 + k - k (p₂/p₁) n-1/n
1 + k - k (p₂/p₁)1/n
1 - k + k (p₁/p₂) n- 1/n

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Compressors, Gas Turbines and Jet Engines
Gas turbine blades are given a rake

Opposite to the direction of motion of blades
Equal to zero
Depending on the velocity
In the direction of motion of blades

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Compressors, Gas Turbines and Jet Engines
Inter-cooling in multistage compressors is done

To minimize the work of compression
To cool the air at delivery
To cool the air during compression
To enable compression in two stages

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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