COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

The pressure of air at the beginning of the compression stroke is ___ the atmospheric pressure.

Less than

None of the listed here

More than

Equal to

TRUE ANSWER : ?
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A compressor at high altitudes will require ___ power.

Same

None of the listed here

More

Less

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Volumetric efficiency of a compressor with clearance volume

In not dependent upon compression ratio

Increases with increase in compression ratio

Decreases with increase in compression ratio

May increase/decrease depending on compressor capacity

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Euler's equation is applicable for

Axial compressor

All of these

Pumps

Centrifugal compressor

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The weight per horse power ratio for gas in Turbine as compared to I.C. engine and steam turbine is

Lower

Same

Higher

None of these

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YOUR ANSWER : ?

Propulsion efficiency of the following order is obtained in practice

0.72

0.6

0.34

0.5

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The work done per unit mass of air in compression will be least when 'n' is equal to

1

1.4

1.3

1.2

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If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

D₁/D₂ = (p₁ p₃)1/2

D₁/D₂ = (p₁ p₃)1/4

D₁/D₂ = (p₁/p₃)1/4

D₁/D₂ = (p₃/p₁)1/4

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The type of rotary compressor used in aeroplanes, is of

Axial flow type

Centrifugal type

None of these

Radial flow type

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Phenomenon of choking in compressor means

No flow of air

Reducing mass flow rate with increase in pressure ratio

Increased inclination of chord with air steam

Fixed mass flow rate regardless of pressure ratio

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YOUR ANSWER : ?

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