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-6 section-3

The inlet pressure is always ________ the discharge pressure.

A) Equal to B) Less than C) More than D) None of these

Discuss

Answer & Solution

Answer: Option B

Solution:

The inlet pressure is always less than the discharge pressure.

The compressor performance at higher altitude compared to sea level will be

A) Same B) Higher C) Lower D) Dependent on other factors

Discuss

Answer & Solution

Answer: Option C

Solution:

The compressor performance at higher altitude compared to sea level will be lower

Separators are generally used in air compressor installations

A) Before the inter-cooler B) After the inter-cooler C) Between the after-cooler and receiver D) Before first stage suction

Discuss

Answer & Solution

Answer: Option C

Solution:

Separators are generally used in air compressor installations Between the after-cooler and receiver

A 3 m³/min compressor means that it

A) Compresses 3 m³/min of standard air B) Compresses 3 m³/min of free air C) Delivers 3 m³/min of compressed air D) Delivers 3 m³/min of compressed air at delivery pressure

Discuss

Answer & Solution

Answer: Option B

Solution:

A 3 m³/min compressor means that it compresses 3 m³/min of free air.

Clearance volume in actual reciprocating compressors is essential

A) To accommodate Valves in the cylinder head B) To provide cushioning effect C) To attain high volumetric efficiency D) To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

Discuss

Answer & Solution

Answer: Option D

Solution:

Clearance volume in actual reciprocating compressors is essential To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

The pressure of air at the beginning of the compression stroke is ________ the atmospheric pressure.

A) Equal to B) Less than C) More than D) None of these

Discuss

Answer & Solution

Answer: Option B

Solution:

The pressure of air at the beginning of the compression stroke is less than the atmospheric pressure.

A closed gas turbine in which fuel is burnt directly in the air is not possible because of

A) Paucity of O₂ B) Increasing gas temperature C) High specific volume D) High friction losses

Discuss

Answer & Solution

Answer: Option A

Solution:

A closed gas turbine in which fuel is burnt directly in the air is not possible because of Paucity of O₂.

For minimum work required to compress and deliver a quantity of air by multistage compression

A) The compression ratio in each stage should be same B) The intercooling should be perfect C) The work-done in each stage should be same D) All of the above

Discuss

Answer & Solution

Answer: Option D

Solution:

For minimum work required to compress and deliver a quantity of air by multistage compression -The compression ratio in each stage should be same -The intercooling should be perfect - The work-done in each stage should be same

Pick up the wrong statement about advantages of multistage compression

A) Better lubrication is possible advantages of multistage B) More loss of air due to leakage past the cylinder C) Mechanical balance is better D) Air can be cooled perfectly in between

Discuss

Answer & Solution

Answer: Option B

Solution:

Advantages of multistage compression
- Better lubrication is possible advantages of multistage
- Mechanical balance is better
- Air can be cooled perfectly in between

Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

A) Less power requirement B) Better mechanical balance C) Less loss of air due to leakage past the cylinder D) Lower volumetric efficiency

Discuss

Answer & Solution

Answer: Option D

Solution:

Advantages of multistage compressor in comparison to single stage compressor
- Less power requirement
- Better mechanical balance
- Less loss of air due to leakage past the cylinder