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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.

Scavenging is usually done to increase__________________?

A thermal efficiency

B speed

C power output

D fuel consumption

Review Detailed Answer

Correct Answer: power output

For the same power developed in I.C. engines, the cheaper system is_____________?

A naturally aspirated

B supercharged

C centrifugal pump

D turbo charger

Review Detailed Answer

Correct Answer: supercharged

Flash point of fuel oil is __________________?

A minimum temperature to which1 oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

B temperature at which it solidifies or congeals

C temperature at which it catches fire without external aid

D indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

Review Detailed Answer

Correct Answer: minimum temperature to which1 oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

The operation of forcing additional air under pressure in the engine cylinder is known as________________?

A scavenging

B turbulence

C supercharging

D pre-ignition

Review Detailed Answer

Correct Answer: supercharging

The magneto in an automobile is basically__________________?

B d.c. generator

C capacitor

D magnetic circuit

Review Detailed Answer

Correct Answer: d.c. generator

Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows ________________?

A using additives in the fuel

B engine derating i.e. reducing the maxi-mum flow of fuel

C increasing the compression ratio

D adherence to proper fuel specification

Review Detailed Answer

Correct Answer: increasing the compression ratio

In a cycle, the spark lasts roughly for ____________________?

A 1 sec

B 0.1 sec

C 0.01 sec

D 0.001 sec

Review Detailed Answer

Correct Answer: 1 sec

A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?

A more efficient

B less efficient

C equally efficient

D unperdictable

Review Detailed Answer

Correct Answer: more efficient

Most high speed compression engines operate on ___________________?

A Otto cycle

B Diesel cycle

C Dual cycle

D Carnot cycle

Review Detailed Answer

Correct Answer: Dual cycle

The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?

A 1500 rpm

B 750 rpm

C 3000 rpm

D any value independent of engine speed

Review Detailed Answer

Correct Answer: 750 rpm

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Scavenging is usually done to increase__________________?

For the same power developed in I.C. engines, the cheaper system is_____________?

Flash point of fuel oil is __________________?

The operation of forcing additional air under pressure in the engine cylinder is known as________________?

The magneto in an automobile is basically__________________?

Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows ________________?

In a cycle, the spark lasts roughly for ____________________?

A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?

Most high speed compression engines operate on ___________________?

The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?