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Compressors, Gas Turbines And Jet Engines MCQ Questions & Answers | Mechanical Engineering

Learn Compressors, Gas Turbines And Jet Engines MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Compressors, Gas Turbines And Jet Engines MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-3 section-1

Each section contains 100 MCQs on Compressors, Gas Turbines and Jet Engines .
21
The ideal efficiency of simple gas turbine cycle depends on
Discuss
Answer & Solution
Answer: Option A
Solution:
The ideal efficiency of simple gas turbine cycle depends on Pressure ratio
22
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
Discuss
Answer & Solution
Answer: Option C
Solution:
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would Increase
23
Ratio of indicated h.p. to shaft h.p. in known as
Discuss
Answer & Solution
Answer: Option D
Solution:
The ratio of the air-indicated horsepower to the indicated horsepower in a power cylinder, in the case of compression driven by steam or internal-combustion engines, and to the brake horsepower delivered to the shaft in the case of a power-driven machine.
24
Ratio of indicated H.P. and brake H.P. is known as
Discuss
Answer & Solution
Answer: Option A
Solution:
Ratio of indicated H.P. and brake H.P. is known as Mechanical efficiency
25
The output of a gas turbine is 300 KW and its efficiency is 20 percent, the heat supplied is
Discuss
Answer & Solution
Answer: Option B
Solution:
Given Data:
Output power = 300 kW
Efficiency = 20% = 0.2

Efficiency = Output power / Input power
Input power = Output power / Efficiency
Input power = 300 / 0.2
Input power = 1500 kW

Therefore, heat supplied is 1500 kW.
26
Reheating in a gas turbine
Discuss
Answer & Solution
Answer: Option A
Solution:
Reheating is applied in a gas turbine in such a way that it increases the turbine work without increasing the compressor work or melting the turbine materials.
When a gas turbine plant has a high pressure and low pressure turbine a reheater can be applied successfully.
27
In axial flow compressor, exit flow angle deviation from the blade angle is a function of
Discuss
Answer & Solution
Answer: Option B
Solution:
In axial flow compressor, exit flow angle deviation from the blade angle is a function of Blade camber and incidence angle
28
The air power of the compressor is also known as
Discuss
Answer & Solution
Answer: Option A
Solution:
Indicated Power is defined as the power developed by combustion of fuel inside the engine cylinder. It is always more than brake power and is given by, Therefore, the difference between ip and bp indicates the power loss in the mechanical components of engine due to friction.
29
To avoid moisture troubles, the compressed air main line should
Discuss
Answer & Solution
Answer: Option B
Solution:
To avoid moisture troubles, the compressed air main line should Drop gradually towards the point of use
30
The ratio of the discharge pressure to the inlet pressure of air is called
Discuss
Answer & Solution
Answer: Option A
Solution:
The ratio of the discharge pressure to the inlet pressure of air is called Compression ratio