Q. The process, which causes the air to enter the impeller blades of a centrifugal compressor at __________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.

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Q. In jet propulsion power unit, the inlet duct of diverging shape is used for converting kinetic energy of air into pressure energy.

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Q. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.

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Q. The mass of gas turbine per kW developed is about __________ as that of an I.C. engine.

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Q. In a centrifugal compressor, the ratio of the __________ to the blade velocity is called slip factor.

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Q. In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

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Q. The air is delivered __________ in one revolution in case of a three-lobbed rotor.

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Q. The temperature of air at the beginning of the compression stroke is __________ the atmospheric temperature.

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Q. The compressor efficiency is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.

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Q. In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.

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Q. In open cycle turbo-jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the

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Q. Gas turbine as compared to internal combustion engine

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Q. The performance of air compressor at high altitudes will be __________ as compared to that at sea level.

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Q. In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

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Q. In a centrifugal compressor, the air enters the impeller axially and leaves the vane radially.

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Q. In gas turbines, the work input with intercooling is __________ the work input with no intercooling.

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Q. The compressor capacity will be __________ if the temperature of intake air is lowest.

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Q. For perfect intercooling in a three stage compressor,

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Q. A machine used to raise the pressure of air is called

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Q. The overall efficiency of the compressed air system is the

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