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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.

The most popular firing order in case of four cylinder in-line I.C. engine is__________________?

A 1-2-3-4

B 1-3-2-4

C 1-4-2-3

D 1-2-4-3

Review Detailed Answer

Correct Answer: 1-3-2-4

Freezing temperature of petrol is usually__________________?

A 0°C

B – 10°C

C 10°C

D less than – 30°C

Review Detailed Answer

Correct Answer: 0°C

The compression ratio of motor cars is___________________?

A 5

B 7

C 10

D 13

Review Detailed Answer

Correct Answer: 7

Ignition quality of diesel-fuel oil is expressed by an index called__________________?

A octane number

B cetane number

C calorific value

D carbon content

Review Detailed Answer

Correct Answer: cetane number

The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________________?

A auto ignition

B preignition

C retarded ignition

D accelerated ignition

Review Detailed Answer

Correct Answer: preignition

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

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

The most popular firing order in case of four cylinder in-line I.C. engine is__________________?

Freezing temperature of petrol is usually__________________?

The compression ratio of motor cars is___________________?

Ignition quality of diesel-fuel oil is expressed by an index called__________________?

The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________________?

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____________________?