Q. Intercooling in compressors results in saving of power in compressing given volume of air to a given pressure.

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Q. Only rocket engines can be propelled to space because

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

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Q. Intercooling in multi-stage compressors is done

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Q. For a two stage reciprocating compressor, compression from p1 to p3 is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p2 is given by

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Q. The ratio of workdone per cycle to the stroke volume of the compressor is known as

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Q. The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency.

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Q. The inlet pressure is always __________ the discharge pressure.

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Q. An aftercooler is used to

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

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Q. 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 reciprocating air compressor with complete intercooling is given by (where D1 = Dia. of L.P. cylinder, and D2 = Dia. of H.P. cylinder)

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Q. 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

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Q. Which of the following statement is wrong?

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Q. In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in __________ of the piston.

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Q. The increase in pressure in a vane blower takes place first due to compression and then due to back flow of air.

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Q. The maximum delivery pressure in a rotary air compressor is

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Q. The capacity of a compressor is expressed in

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Q. The increase in pressure in a roots blower is entirely due to back flow of air.

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Q. The type of rotary compressor used in aeroplanes, is of

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Q. An axial compressor gives optimum performance at high speeds and large volume flows.

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