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Compressors, Gas Turbines and Jet Engines

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 20°C
1 bar and 40°C
0.1 bar and 20°C

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Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

All of these
Its functioning does not depend on presence of air
The propulsive matter is caused to flow around the propelled body
Propulsive matter is ejected from within the propelled body

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Compressors, Gas Turbines and Jet Engines
Isothermal compression efficiency, even when running at high speed, can be approached by using

Multistage compression
Cold water spray
Both (A) and (B) above
Fully insulating the cylinder

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Compressors, Gas Turbines and Jet Engines
The work ratio of simple gas turbine cycle depends on

All of these
Minimum cycle temperature
Maximum cycle temperature
Pressure ratio

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Compressors, Gas Turbines and Jet Engines
Propulsion efficiency of the following order is obtained in practice

0.34
0.72
0.5
0.6

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Compressors, Gas Turbines and Jet Engines
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.

Reduced
Zero
None of these
Increased

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