Compressors, Gas Turbines & Jet Engines MCQ Question with Answer

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

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

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