Compressors, Gas Turbines And Jet Engines MCQ Questions & Answers

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-9 section-2

For maximum work, the reheating should be done to an intermediate pressure of
(Where p₁ = Maximum pressure and p₂ = Minimum pressure)

A) $$\frac{{{{\text{p}}_1} - {{\text{p}}_2}}}{2}$$ B) $$\frac{{{{\text{p}}_1} + {{\text{p}}_2}}}{2}$$ C) $$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}$$ D) $${{\text{p}}_1}{{\text{p}}_2}$$

Discuss

Answer & Solution

Answer: Option D

Solution:

For maximum work, the reheating should be done to an intermediate pressure of $${{\text{p}}_1}{{\text{p}}_2}$$
Where,
p₁ = Maximum pressure,
p₂ = Minimum pressure

Inter-cooling in multistage compressors is done

A) To cool the air during compression B) To cool the air at delivery C) To enable compression in two stages D) To minimize the work of compression

Discuss

Answer & Solution

Answer: Option D

Solution:

Inter-cooling in multistage compressors is done To minimize the work of compression

The efficiency and work ratio of a gas turbine plant can be increased by

A) Adding heat exchanger B) Injecting water in/around combustion chamber C) Reheating the air after partial expansion in the turbine D) All of the above

Discuss

Answer & Solution

Answer: Option D

Solution:

The efficiency and work ratio of a gas turbine plant can be increased by -Adding heat exchanger -Injecting water in/around combustion chamber -Reheating the air after partial expansion in the turbine

The thrust of a jet propulsion power unit can be increased by

A) Injecting water into the compressor B) Burning fuel after gas turbine C) Injecting ammonia into the combustion chamber D) All of the above

Discuss

Answer & Solution

Answer: Option D

Solution:

The thrust of a jet propulsion power unit can be increased by - Injecting water into the compressor -Burning fuel after gas turbine - Injecting ammonia into the combustion chamber

Euler's equation can be used for

A) Radial flow compressors B) Axial flow compressors C) Pumps D) All of these

Discuss

Answer & Solution

Answer: Option D

Solution:

Euler's equation can be used for -Radial flow compressors -Axial flow compressors -Pumps

Adiabatic compression is one in which

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

Discuss

Answer & Solution

Answer: Option B

Solution:

Adiabatic compression is one in which No heat leaves or enters the compressor cylinder during compression

Ratio of compression is the ratio of

A) Gauge discharge pressure to the gauge intake pressure B) Absolute discharge pressure to the absolute intake pressure C) Pressures at discharge and suction corresponding to same temperature D) Stroke volume and clearance volume

Discuss

Answer & Solution

Answer: Option B

Solution:

Ratio of compression is the ratio of Absolute discharge pressure to the absolute intake pressure

The work done per unit mass of air in compression will be least when 'n' is equal to

A) 1 B) 1.2 C) 1.3 D) 1.4

Discuss

Answer & Solution

Answer: Option A

Solution:

The work done per unit mass of air in compression will be least when 'n' is equal to 1

The efficiency of roots blower ________ with the increase in pressure ratio.

A) Decreases B) Increases C) Does not change D) None of these

Discuss

Answer & Solution

Answer: Option A

Solution:

The efficiency of roots blower Decreases with the increase in pressure ratio.

During peak load periods, the best method of controlling compressors is

A) Start-stop motor B) Constant speed unloader C) Relief valve D) Variable speed

Discuss

Answer & Solution

Answer: Option B

Solution:

During peak load periods, the best method of controlling compressors is Constant speed unloader