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ME Set-1
Compressors Gas dynamics and Gas Turbines
41

Compressors Gas dynamics and Gas Turbines MCQ with Answers

41) An aftercooler is used to

remove impurities from air

reduce volume of air

cause moisture and oil vapour to drop out

cool the air

Answer is:

cause moisture and oil vapour to drop out

Compressors Gas dynamics and Gas Turbines MCQ with Answers

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Related Compressors Gas dynamics and Gas Turbines MCQ with Answers

42) High air-fuel ratio in gas turbines

increases power output

improves thermal efficiency

reduces exhaust temperature

do not damage turbine blades

Answer is:

reduces exhaust temperature

43) The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as

compressor efficiency

volumetric efficiency

isothermal efficiency

mechanical efficiency

Answer is:

volumetric efficiency

44) If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or intercooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocatin

D₁/D₂ = p₁p₂

D₁/D₂ = p₁/p₂

D₁/D₂ = p₂/p₁

none of these

Answer is:

D₁/D₂ = p₂/p₁

45) The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

compressor efficiency

volumetric efficiency

isothermal efficiency

mechanical efficiency

Answer is:

mechanical efficiency

Compressors Gas dynamics and Gas Turbines MCQ with Answers

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