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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
A gas turbine used in air craft should have

Low weight and small frontal area
High speed and high h.p.
Small frontal area and high h.p.
High h.p. and low weight

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Compressors, Gas Turbines and Jet Engines
Ramjet engine

Produces a jet consisting of plasma
Is not self operating at zero flight speed
Is self operating at zero flight speed
Requires no air for its operation

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Compressors, Gas Turbines and Jet Engines
Reheating in gas turbine results in

Increase of work ratio
Decrease of work ratio
Both (A) and (B) above
Decrease of thermal efficiency

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Compressors, Gas Turbines and Jet Engines
In a jet engine, the air-fuel ratio is

2.5006944444444
1.2506944444444
2.0840277777778
1.6673611111111

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Compressors, Gas Turbines and Jet Engines
If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches

Isochoric
Isentropic
Isothermal
Adiabatic

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

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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