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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 maximum during

Polytropic compression
None of these
Isothermal compression
Isentropic compression

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Compressors, Gas Turbines and Jet Engines
A 3 m³/min compressor means that it

Compresses 3 m³/min of standard air
Delivers 3 m³/ min of compressed air at delivery pressure
Delivers 3 m³/ min of compressed air
Compresses 3 m³/ min of free air

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Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

U < Vo
Vt > Vo
V = Uo
Vi = Vo

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Compressors, Gas Turbines and Jet Engines
Diffuser in a compressor is used to

Convert pressure energy into kinetic energy
Convert kinetic energy into pressure energy
Make the flow streamline
Increase velocity

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Compressors, Gas Turbines and Jet Engines
The work ratio of a gas turbine plant is defined as the ratio of

Net work output and work done by turbine
Actual heat drop and isentropic heat drop
Net work output and isentropic heat drop
Net work output and heat supplied

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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?

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

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