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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Standard air is the air at ___ and relative humidity of 36 percent.

0.1 bar and 40°C
0.1 bar and 20°C
1 bar and 20°C
1 bar and 40°C

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Compressors, Gas Turbines and Jet Engines
A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.

Same
Lower
Higher
None of these

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

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

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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 (p₁/p₂)1/n
1 + k - k (p₂/p₁)1/n

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Compressors, Gas Turbines and Jet Engines
The thermal efficiency of a gas turbine as compared to a diesel plant is

Same
More
Less
Depends on other factors

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

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

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