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-4 section-2

In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to

A) N.T.P. conditions B) Intake temperature and pressure conditions C) 0°C and 1 kg/cm² D) 20°C and 1 kg/cm²

Discuss

Answer & Solution

Answer: Option B

Solution:

In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to Intake temperature and pressure conditions.

When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

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

Discuss

Answer & Solution

Answer: Option A

Solution:

When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is equal to the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

The mass of gas turbine per kW developed is about ________ as that of an I.C. engine.

A) Same B) One-half C) One fourth D) One sixth

Discuss

Answer & Solution

Answer: Option D

Solution:

The mass of gas turbine per kW developed is about one sixth as that of an I.C. engine.

A jet engine works on the principle of conservation of

A) Mass B) Energy C) Flow D) Linear momentum

Discuss

Answer & Solution

Answer: Option D

Solution:

A jet engine works on the principle of conservation of Linear momentum

A compressor mostly used for supercharging of I.C. engines is

A) Radial flow compressor B) Axial flow compressor C) Roots blower D) Reciprocating compressor

Discuss

Answer & Solution

Answer: Option A

Solution:

A compressor mostly used for supercharging of I.C. engines is Radial flow compressor

Propulsive efficiency is defined as ratio of

A) Thrust power and fuel energy B) Engine output and propulsive power C) Propulsive power and fuel input D) Thrust power and propulsive power

Discuss

Answer & Solution

Answer: Option D

Solution:

Propulsive efficiency is defined as ratio of Thrust power and propulsive power

The degree of reaction is usually kept ________ for all types of axial flow compressors.

A) 0.2 B) 0.3 C) 0.4 D) 0.5

Discuss

Answer & Solution

Answer: Option D

Solution:

The degree of reaction is usually kept 0.5 for all types of axial flow compressors.

The material commonly used for air craft gas turbine is

A) Stainless steel B) High alloy steel C) Duralumin D) Timken, Haste alloys

Discuss

Answer & Solution

Answer: Option D

Solution:

The material commonly used for air craft gas turbine is Timken, Haste alloys

Which one of the following is the effect of blade shape on performance of a centrifugal compressor?

A) Backward curved blades has poor efficiency B) Backward curved blades lead to stable performance C) Forward curved blades has higher efficiency D) Forward curved blades produce lower pressure ratio

Discuss

Answer & Solution

Answer: Option D

Solution:

Forward curved blades produce lower pressure ratio is the main effect of blade shape on performance of a centrifugal compressor

Intercooling in gas turbines

A) Decreases net output but increases thermal efficiency B) Increases net output but decreases thermal efficiency C) Decreases net output and thermal efficiency both D) Increases net output and thermal efficiency both

Discuss

Answer & Solution

Answer: Option D

Solution:

Intercooling in gas turbines Increases net output and thermal efficiency both