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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
During peak load periods, the best method of controlling compressors is

Constant speed unloader
Variable speed
Relief valve
Start-stop motor

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Compressors, Gas Turbines and Jet Engines
During base load operation, the best method of controlling compressor is

Relief valve
Constant speed unloader
Start-stop motor
Variable speed

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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

0.9
0.99
0.85
0.75

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

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

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Compressors, Gas Turbines and Jet Engines
The indicated work per unit mass of air delivered is

Directly proportional to clearance volume
Not affected by clearance volume
Greatly affected by clearance volume
Inversely proportional to clearance volume

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Compressors, Gas Turbines and Jet Engines
The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is

Low/high depending on make and type
High
Same
Low

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