COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

Volumetric efficiency of a compressor decreases with ________ in compression ratio.

Remain same

Does not change

Decrease

Increase

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The absolute pressure of air at the outlet of a compressor is called

Discharge pressure

Critical pressure

None of the listed here

Back pressure

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

Same

None of these

Lower

Higher

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The ratio of isentropic work to Euler work is known as

Slip factor

Pressure coefficient

Polytropic reaction

Work coefficient

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The compressor capacity is defined as the

Volume of air sucked by the compressor during its suction stroke

Volume of air delivered by the compressor

None of these

Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

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The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Rotor to static enthalpy rise in the stator

Rotor to static enthalpy rise in the stage

Stator to static enthalpy rise in the stage

Stator to static enthalpy rise in the rotor

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The thrust on the rotor in a centrifugal compressor is produced by

Tangential component

Axial component

Radial component

None of these

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If the flow of air through the compressor is parallel to its axis, then the compressor is

Centrifugal compressor

Reciprocating compressor

Axial flow compressor

Turbo compressor

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Ratio of indicated H.P. and brake H.P. is known as

Adiabatic efficiency

Isothermal efficiency

Volumetric efficiency

Mechanical efficiency

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In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by

W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)

W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)

W₁/W₂ = n₂/n₁

W₁/W₂ = n₁/n₂

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