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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The absolute pressure of air at the outlet of a compressor is called

Critical pressure
None of the listed here
Back pressure
Discharge pressure

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

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

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Compressors, Gas Turbines and Jet Engines
In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as

Work factor
Degree of reaction
Pressure coefficient
Slip factor

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

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Compressors, Gas Turbines and Jet Engines
For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum pressure, and p₂ = Minimum pressure)

p₁/p₂
p₁ p₂
(p₁ + p₂)/2
(p₁ - p₂)/2

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Compressors, Gas Turbines and Jet Engines
Work ratio of a gas turbine may be improved by

Decreasing the compression work
Both (A) and (C) above
Increasing the compression work
Increasing the turbine work

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