Mechanical Engineering:: Compressors, Gas Dynamics and Gas Turbines

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

A. compressor efficiency B. volumetric efficiency
C. isothermal efficiency D. mechanical efficiency

High air-fuel ratio in gas turbines

A. increases power output
B. improves thermal efficiency
C reduces exhaust temperature
D. do not damage turbine blades

An aftercooler is used to

A. remove impurities from air
B. reduce volume of air
C cause moisture and oil vapour to drop outcause moisture and oil vapour to drop out
D. cool the air

The maximum combustion pressure in gas turbine is __________ as compared to I.C. engine.

A. more B. less

Only rocket engines can be propelled to space because

A. they can generate very high thrust
B. they have high propulsion efficiency
C these engines can work on several fuels
D. they are not air-breathing engines

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