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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The thrust on the rotor in a centrifugal compressor is produced by

Tangential component
None of these
Radial component
Axial component

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

Back pressure
None of the listed here
Discharge pressure
Critical pressure

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Compressors, Gas Turbines and Jet Engines
A turboprop is preferred to turbojet because

It has high power for take off
It has high propulsive efficiency at high speeds
It can fly at supersonic speeds
It can fly at high elevations

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

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

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Compressors, Gas Turbines and Jet Engines
The efficiency of roots blower ________ with the increase in pressure ratio.

Increases
Does not change
Decreases
None of these

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Compressors, Gas Turbines and Jet Engines
The ratio of specific weight/h.p. of gas turbine and I.C engines may be typically of the order of

0.16736111111111
0.084027777777778
0.042361111111111
0.045833333333333

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