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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Reheating in multistage expansion gas turbine results in

Reduction in compressor work
Maximum work output
High thermal efficiency
Decrease of heat loss in exhaust

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Compressors, Gas Turbines and Jet Engines
Pressure ratio in gas turbines is the ratio of

Compressor pressure ratio
Inlet pressure to exhaust pressure
Pressures across the turbine
Highest pressure to exhaust pressure

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Compressors, Gas Turbines and Jet Engines
Inter cooling in compressors

Results in saving of power in compressing a given volume to given pressure
Enables compression in two stages
Cools the delivered air
Is the standard practice for big compressors

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Compressors, Gas Turbines and Jet Engines
Ram compression in turbojet involves

Lost work
Increasing speed of incoming air
Reduction of speed of incoming air and conversion of part of it into pressure energy
Compression of inlet air

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Compressors, Gas Turbines and Jet Engines
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

0.99
0.85
0.9
0.75

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Compressors, Gas Turbines and Jet Engines
Standard air is the air at ___ and relative humidity of 36 percent.

0.1 bar and 40°C
1 bar and 40°C
0.1 bar and 20°C
1 bar and 20°C

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