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-10 section-2

Inter cooling in compressors

A) Cools the delivered air B) Results in saving of power in compressing a given volume to given pressure C) Is the standard practice for big compressors D) Enables compression in two stages

Discuss

Answer & Solution

Answer: Option B

Solution:

Inter cooling in compressors Results in saving of power in compressing a given volume to given pressure

Isothermal compression efficiency can be attained by running the compressor

A) At very high speed B) At very slow speed C) At average speed D) At zero speed

Discuss

Answer & Solution

Answer: Option B

Solution:

Isothermal compression efficiency can be attained by running the compressor At very slow speed

Fighter bombers use following type of engine

A) Turbojet B) Turbo-propeller C) Rocket D) Ramjet

Discuss

Answer & Solution

Answer: Option A

Solution:

Fighter bombers use turbojet type of engine

The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.

A) Reduced B) Increased C) Zero D) None of these

Discuss

Answer & Solution

Answer: Option A

Solution:

The process, which causes the air to enter the impeller blades of a centrifugal compressor at reduced velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.

For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

A) Increase B) Decrease C) Remain unaffected D) Other factors control it

Discuss

Answer & Solution

Answer: Option A

Solution:

For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will increase

High air-fuel ratio in gas turbines

A) Increases power output B) Improves thermal efficiency C) Reduces exhaust temperature D) Do not damage turbine blades

Discuss

Answer & Solution

Answer: Option C

Solution:

High air-fuel ratio in gas turbines Reduces exhaust temperature

In the axial flow gas turbine, the work ratio is the ratio of

A) Compressor work and turbine work B) Output and input C) Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet D) Actual compressor work and theoretical compressor work

Discuss

Answer & Solution

Answer: Option C

Solution:

In the axial flow gas turbine, the work ratio is the ratio of Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet

Which of the following statement is correct relating to rocket engines?

A) The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel B) The stagnation conditions exist at the combustion chamber C) The exit velocities of exhaust gases are much higher than those in jet engine D) All of the above

Discuss

Answer & Solution

Answer: Option D

Solution:

The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel - The stagnation conditions exist at the combustion chamber -The exit velocities of exhaust gases are much higher than those in jet engine

The power available for takeoff and climb in case of turbojet engine as compared to reciprocating engine is

A) Less B) More C) Same D) May be less or more depending on ambient conditions

Discuss

Answer & Solution

Answer: Option A

Solution:

The power available for takeoff and climb in case of turbojet engine as compared to reciprocating engine is Less

100

Gas turbines use following type of air compressor

A) Centrifugal type B) Reciprocating type C) Lobe type D) Axial flow type

Discuss

Answer & Solution

Answer: Option D

Solution:

Gas turbines use following type of air compressor Axial flow type