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-7 section-1

Propulsion efficiency of the following order is obtained in practice

A) 34% B) 50% C) 60% D) 72%

Discuss

Answer & Solution

Answer: Option C

Solution:

Propulsion efficiency of the following order is obtained in practice 60%

The maximum delivery pressure in a rotary air compressor is

A) 10 bar B) 20 bar C) 30 bar D) 50 bar

Discuss

Answer & Solution

Answer: Option A

Solution:

The maximum delivery pressure in a rotary air compressor is 10 bar.

In a closed cycle gas turbine, the air is compressed

A) Isothermally B) Polytropically C) Isentropically D) None of these

Discuss

Answer & Solution

Answer: Option C

Solution:

In a closed cycle gas turbine, the air is compressed isentropically

In a double acting compressor, the air is compressed

A) In one cylinder B) In two cylinders C) In a single cylinder on both sides of the piston D) In two cylinders on both sides of the piston

Discuss

Answer & Solution

Answer: Option C

Solution:

In a double acting compressor, the air is compressed In a single cylinder on both sides of the piston

The work-done on a compressor will be minimum if air is taken from

A) The atmosphere B) A source at 0° C C) A source of low temperature air D) A source of high temperature air

Discuss

Answer & Solution

Answer: Option C

Solution:

The work-done on a compressor will be minimum if air is taken from A source of low temperature air

Free air is the air at

A) Atmospheric conditions at any specific location B) 20°C and 1 kg/cm² and relative humidity of 36% C) 0°C and standard atmospheric conditions D) 15°C and 1 kg/cm²

Discuss

Answer & Solution

Answer: Option A

Solution:

Free air is the air at Atmospheric conditions at any specific location.

Standard air is the air at

A) Atmospheric conditions at any specific location B) 20°C and 1 kg/cm² and relative humidity 36% C) 0°C and standard atmospheric conditions D) 15°C and 1 kg/cm²

Discuss

Answer & Solution

Answer: Option B

Solution:

Standard air is the air at 20°C and 1 kg/cm² and relative humidity 36%.

The overall efficiency of the compressed air system is the

A) Ratio of shaft output of the air motor to the shaft input to the compressor B) Ratio of shaft input to the compressor to the shaft output of air motor C) Product of shaft output of air motor and shaft input to the compressor D) None of the above

Discuss

Answer & Solution

Answer: Option A

Solution:

The overall efficiency of the compressed air system is the Ratio of shaft output of the air motor to the shaft input to the compressor

In a jet engine, the air-fuel ratio is

A) 30 : 1 B) 40 : 1 C) 50 : 1 D) 60 : 1

Discuss

Answer & Solution

Answer: Option D

Solution:

In a jet engine, the air-fuel ratio is 60 : 1.

The reason for volumetric efficiency of reciprocating compressor being less than 100 percent is

A) Pressure drop across the valves B) Superheating in compressor C) Clearance volume and leakages D) All of these

Discuss

Answer & Solution

Answer: Option D

Solution:

The reason for volumetric efficiency of reciprocating compressor being less than 100 percent is
- Pressure drop across the valves
- Superheating in compressor
- Clearance volume and leakages