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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

None of these
Polytropic compression
Isothermal compression
Isentropic compression

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Compressors, Gas Turbines and Jet Engines
Isothermal compression though most efficient, but is not practicable because

It does not increase pressure much
It requires very big cylinder
Compressor has to run at very slow speed to achieve it
It is impossible in practice

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Compressors, Gas Turbines and Jet Engines
Surging is the phenomenon of

Air stream blocking the passage
Motion of air at sonic velocity
Unsteady, periodic and reversed flow
Air stream not able to follow the blade contour

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Compressors, Gas Turbines and Jet Engines
In a high pressure compressor, the delivery pressure is

10 to 15 bar
1 to 5 bar
5 to 8 bar
8 to 10 bar

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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)/2
(p₁ - p₂)/2
p₁ p₂

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

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

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