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Mechanical Engineering - Compressors, Gas Dynamics and Gas Turbines

Exercise : Compressors, Gas Dynamics and Gas Turbines - Section 2
21.
The axial flow compressor is preferred in air-craft gas turbines because of
low frontal area
higher thrust
high pressure rise
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Which of the following statement is correct as regard to centrifugal compressors?
The flow of air is parallel to the axis of the compressor.
The static pressure of air in the impeller increases in order to provide centripetal force on the air.
The impeller rotates at high speeds.
The maximum efficiency is higher than multi-stage axial flow compressors.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The ratio of the net work obtained from the gas turbine plant to the turbine work is known as
compression ratio
work ratio
pressure ratio
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
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
increased
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
In jet propulsion power unit, the inlet duct of diverging shape is used for converting kinetic energy of air into pressure energy.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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