COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

The air is delivered ________ in one revolution in case of a three lobbed rotor.

Two times

Three times

Four times

Six times

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If the flow of air through the compressor is perpendicular to its axis, then it is a

Reciprocating compressor

Axial flow compressor

Turbo compressor

Centrifugal compressor

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Axial flow compressor has the following advantage over centrifugal compressor

Aerofoil blades are used

Larger air handling ability per unit frontal area

Higher average velocities

Higher pressure ratio per stage

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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)1/4

D₁/D₂ = (p₁ p₃)1/4

D₁/D₂ = (p₃/p₁)1/4

D₁/D₂ = (p₁ p₃)1/2

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Turbofan engine employs

Solid fuel firing

One air stream

No air stream

Two or more air streams

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A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.

None of these

Lower

Higher

Same

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The maximum delivery pressure in a rotary air compressor is

10 bar

20 bar

50 bar

30 bar

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Gas turbines use following type of air compressor

Reciprocating type

Centrifugal type

Lobe type

Axial flow type

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Pick up the correct statement

Gas turbines use both air and liquid cooling

Gas turbines have their blades similar to steam turbine

Large gas turbines use radial inflow turbines

Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip

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Maximum delivery pressure is a rotary air compressor is of the order of

10 kg/cm²

25 kg/cm²

6 kg/cm²

16 kg/cm²

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