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 : 29
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

75 %

85 %

90 %

99 %

Question No : 30
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

Question No : 31
Pressure ratio in gas turbines is the ratio of

Compressor pressure ratio

Highest pressure to exhaust pressure

Inlet pressure to exhaust pressure

Pressures across the turbine

Question No : 32
In the cross compounding of the gas turbine plant

H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine

H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine

Both the arrangements can be employed

All are connected in series

Question No : 33
Which of the following fuels can be used in turbojet engines?

Liquid hydrogen

High speed diesel oil

Kerosene

Methyl alcohol

Question No : 34
The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁² -v₂²)/2g

(v₁ - v₂)²/2g

(v₁² -v₂²)/g

(v₁ - v₂)²/g

Question No : 35
Intercooling in gas turbines

Decreases net output but increases thermal efficiency

Increases net output but decreases thermal efficiency

Decreases net output and thermal efficiency both

Increases net output and thermal efficiency both