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Compressors, Gas Turbines & Jet Engines MCQ - Multiple Choice Question and Answer

Compressors, Gas Turbines & Jet Engines MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 1
The pressure ratio in gas turbines is of the order of

2 : 1
4 :1
61 : 1
9 : 1

Question No : 2
Adiabatic compression is one in which

Temperature during compression remains constant
No heat leaves or enters the compressor cylinder during compression
Temperature rise follows a linear relationship
Work done is maximum

Question No : 3
If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches

Isothermal
Isentropic
Adiabatic
Isochoric

Question No : 4
Inter-cooling in gas turbine results in

Increase in net output but decrease in thermal efficiency
Increase in thermal efficiency but decrease in net output
Increase in both thermal efficiency and net output
Decrease in both thermal efficiency and net output

Question No : 5
The air entry velocity m a rocket as compared to aircraft is

Same
More
Less
Zero

Question No : 6
The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

W₁/(W₁ + W₂)
W₂/(W₁ + W₂)
(W₁ + W₂)/W₁
(W₁ + W₂)/W₂

Question No : 7
In a closed cycle gas turbine, the air is compressed

Isothermally
Polytropically
Isentropically
None of these