COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

Less loss of air due to leakage past the cylinder

Less power requirement

Better mechanical balance

Lower volumetric efficiency

TRUE ANSWER : ?
YOUR ANSWER : ?

The thrust of a jet propulsion power unit can be increased by

Burning fuel after gas turbine

All of these

Injecting water into the compressor

Injecting ammonia into the combustion chamber

TRUE ANSWER : ?
YOUR ANSWER : ?

Propulsion efficiency of the following order is obtained in practice

0.72

0.34

0.5

0.6

TRUE ANSWER : ?
YOUR ANSWER : ?

A rocket works with maximum overall efficiency when air craft velocity is equal to the

Half the jet velocity

Average of the jet velocity

Twice the jet velocity

Jet velocity

TRUE ANSWER : ?
YOUR ANSWER : ?

In a centrifugal compressor, the flow of air is ________ to the axis of compressor.

Inclined

Parallel

None of these

Perpendicular

TRUE ANSWER : ?
YOUR ANSWER : ?

A centrifugal compressor works on the principle of

Conversion of pressure energy into kinetic energy

Centripetal action

Generating pressure directly

Conversion of kinetic energy into pressure energy

TRUE ANSWER : ?
YOUR ANSWER : ?

Standard air is the air at

0°C and standard atmospheric conditions

15°C and 1 kg/cm²

Atmospheric conditions at any specific location

20°C and 1 kg/cm² and relative humidity 36%

TRUE ANSWER : ?
YOUR ANSWER : ?

The work-done on a compressor will be minimum if air is taken from

A source at 0° C

The atmosphere

A source of low temperature air

A source of high temperature air

TRUE ANSWER : ?
YOUR ANSWER : ?

For perfect intercooling in a three stage compressor

p₁ p₃ = p₂ p₄

p₁ p₂ = p₃ p₄

p₃/p₁ = p₄/p₂

p₂/p₁ = p₃/p₂ = p₄/p₃

TRUE ANSWER : ?
YOUR ANSWER : ?

The pressure ratio in gas turbines is of the order of

0.16736111111111

0.37569444444444

0.084027777777778

2.5423611111111

TRUE ANSWER : ?
YOUR ANSWER : ?

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