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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.

According to Recardo’s theory, detonation occurs due to______________________?

A instantaneous auto-ignition of last part of charge to be burnt

B improper mixing of air and fuel

C improper combustion

D self ignition temperature has nothing to do with detonation

Review Detailed Answer

Correct Answer: instantaneous auto-ignition of last part of charge to be burnt

The knocking in diesel engines for given fuel, will be__________________?

A enhanced by increasing compression ratio

B enhanced by decreasing compression ratio

C unaflected by compression ratio

D first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed

Review Detailed Answer

Correct Answer: enhanced by decreasing compression ratio

Injection lag is_________________?

A the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature

B time before actual fuel injection and the pump pluger starts to pump fuel

C time corresponding to actual injection and top dead center

D time corresponding to actual ignition and top dead center

Review Detailed Answer

Correct Answer: time before actual fuel injection and the pump pluger starts to pump fuel

Carbon residue in diesel oil should not be more than___________________?

A 1%

B 0.5%

C 0.1%

D 0.01%

Review Detailed Answer

Correct Answer: 1%

Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?

A not true

B true at full load

C true at part load

D true at both part and full load

Review Detailed Answer

Correct Answer: true at both part and full load

Piston rings are plated with chromium,cadmium or phosphate in order to__________________?

A reduce cost

B improve surface finish

C prevent clogging

D reduce wear and eliminate scuffing

Review Detailed Answer

Correct Answer: reduce wear and eliminate scuffing

The pistons are usually given a coating such as tin plating in order to________________?

A reduce weight

B conduct heat efficiently

C reduce possibility of scoring

D reduce friction

Review Detailed Answer

Correct Answer: reduce possibility of scoring

If overhead clearance is less, then the following type of engine should be selected__________________?

A V-type

B In-line

C Vertical

D Horizontal

Review Detailed Answer

Correct Answer: Horizontal

The top piston ring nearer to the piston crown is known as_____________________?

A compression ring

B oil ring

C scrapper ring

D groove ring

Review Detailed Answer

Correct Answer: compression ring

Piston rings are usually made of___________________?

A cast iron

B aluminium

C phosphor bronze

D babbitt

Review Detailed Answer

Correct Answer: cast iron

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

According to Recardo’s theory, detonation occurs due to______________________?

The knocking in diesel engines for given fuel, will be__________________?

Injection lag is_________________?

Carbon residue in diesel oil should not be more than___________________?

Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?

Piston rings are plated with chromium,cadmium or phosphate in order to__________________?

The pistons are usually given a coating such as tin plating in order to________________?

If overhead clearance is less, then the following type of engine should be selected__________________?

The top piston ring nearer to the piston crown is known as_____________________?

Piston rings are usually made of___________________?