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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The volume of air delivered in a medium capacity air compressor per unit time is

None of these
0.1 to 1.2 m³/s
0.15 to 5 m³/s
Above 5 m³/s

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Compressors, Gas Turbines and Jet Engines
The ratio of the net work obtained from the gas turbine plant to the turbine work is known as

None of these
Compression ratio
Work ratio
Pressure ratio

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

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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
Compressor has to run at very slow speed to achieve it
It requires very big cylinder
It is impossible in practice

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Compressors, Gas Turbines and Jet Engines
The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁ - v₂)²/g
(v₁ - v₂)²/2g
(v₁² -v₂²)/g
(v₁² -v₂²)/2g

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Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor, without clearance, the work-done on the air during isentropic compression is ________ the heat required to raise the temperature of air from T₁ to T₂ at a constant pressure.

Greater than
Equal to
None of these
Less than

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