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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

In the aircraft propellers __________________?

A the propulsive matter is caused to flow around the propelled body

B propulsive matter is ejected from within the propelled body

C its functioning does not depend on presence of air

D all of the above

Review Detailed Answer

Correct Answer: all of the above

Reheating in gas turbine results in___________________?

A increase of work ratio

B decrease of thermal efficiency

C decrease of work ratio

D both A. and B. above

Review Detailed Answer

Correct Answer: both A. and B. above

High air-fuel ratio is used in gas turbines______________________?

A to increase the output

B to increase the efficiency

C to save fuel

D to reduce the exit temperature

Review Detailed Answer

Correct Answer: to reduce the exit temperature

In jet engines the compression ratio__________________?

A varies as square root of the speed

B Varies linearly to the speed

C varies as square of the speed

D varies as cube of the speed

Review Detailed Answer

Correct Answer: varies as square of the speed

Air-fuel ratio in a jet engine will be of the order of__________________?

A 10: 1

B 15: 1

C 20 : 1

D 60 : 1

Review Detailed Answer

Correct Answer: 60 : 1

The effective power of gas turbines is increased by adding the following in compressor__________________?

A ammonia and water vapour

B carbon dioxide

C nitrogen

D hydrogen

Review Detailed Answer

Correct Answer: ammonia and water vapour

The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________?

A increase first at fast rate and then slow

B increase first at slow rate and then fast

C decrease continuously

D first increase, reach maximum and then decrease

Review Detailed Answer

Correct Answer: first increase, reach maximum and then decrease

The following property is most important for material used for gas turbine blade___________________?

A toughness

B fatigue

C creep

D corrosion resistance

Review Detailed Answer

Correct Answer: creep

Fighter bombers use following type of engine __________________?

A turbo-jet

B turbo-propeller

C rocket

D ram-jet ,

Review Detailed Answer

Correct Answer: turbo-jet

The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?

A same

B higher

C lower

D uncomparable

Review Detailed Answer

Correct Answer: lower

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

In the aircraft propellers __________________?

Reheating in gas turbine results in___________________?

High air-fuel ratio is used in gas turbines______________________?

In jet engines the compression ratio__________________?

Air-fuel ratio in a jet engine will be of the order of__________________?

The effective power of gas turbines is increased by adding the following in compressor__________________?

The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________?

The following property is most important for material used for gas turbine blade___________________?

Fighter bombers use following type of engine __________________?

The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?