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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

r ɣ-1
1 - r ɣ-1
1 - (1/r) ɣ-1/ɣ
1 - (1/r) ɣ/ɣ-1

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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

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

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

Polytropic compression
Isentropic compression
None of these
Isothermal compression

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Compressors, Gas Turbines and Jet Engines
The pressure of air at the beginning of the compression stroke is ___ the atmospheric pressure.

More than
Equal to
None of the listed here
Less than

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Compressors, Gas Turbines and Jet Engines
The efficiency of a jet engine is higher at

High altitudes
Low speeds
Low altitudes
High speeds

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Compressors, Gas Turbines and Jet Engines
The compressor efficiency is the

Isothermal H.P/indicated H.R
Total output/air input
Isothermal H.P./shaft H.R
Compression work/motor input

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