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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 air-fuel ratio in petrol engines-is controlled by__________________?

A controlling valve opening/closing

B governing

C injection

D carburettion

Review Detailed Answer

Correct Answer: carburettion

Pour point of fuel oil is the_________________?

A minimum temperature to which 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 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: temperature at which it solidifies or congeals

For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of _________________?

A 9 : 1

B 12 : 1

C 15 : 1

D 18 : 1

Review Detailed Answer

Correct Answer: 12 : 1

Air fuel ratio for idling speed of a petrol engine is approximately_________________?

A 1 : 1

B 5 : 1

C 10:1

D 15 : 1

Review Detailed Answer

Correct Answer: 10:1

Which of the following is the lightest and most volatile liquid fuel________________?

A diesel

B kerosene

C fuel oil

D gasoline

Review Detailed Answer

Correct Answer: gasoline

In a typical medium speed 4 stroke cycle diesel engine_______________?

A exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center

B exhaust valve opens at bottom ‘dead center and closes at top dead center

C exhaust valve opens just after bottom dead center and closes just before top dead center

D may open and close anywhere

Review Detailed Answer

Correct Answer: exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center

Supercharging is essential in_____________?

A diesel engines

B gas turbines

C petrol engines

D aircraft engines

Review Detailed Answer

Correct Answer: aircraft engines

The reason for supercharging in any engine is to________________?

A increase efficiency

B increase power

C reduce weight and bulk for a given out-put

D effect fuel economy

Review Detailed Answer

Correct Answer: reduce weight and bulk for a given out-put

The actual volume of fresh charge admitted in 4-stroke petrol engine is_________________?

A equal to stroke volume

B equal to stroke volume and clearance volume

C less than stroke volume

D more than stroke volume

Review Detailed Answer

Correct Answer: less than stroke volume

The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be________________?

A higher

B lower

C remain unaffected

D unpredictable

Review Detailed Answer

Correct Answer: higher

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

The air-fuel ratio in petrol engines-is controlled by__________________?

Pour point of fuel oil is the_________________?

For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of _________________?

Air fuel ratio for idling speed of a petrol engine is approximately_________________?

Which of the following is the lightest and most volatile liquid fuel________________?

In a typical medium speed 4 stroke cycle diesel engine_______________?

Supercharging is essential in_____________?

The reason for supercharging in any engine is to________________?

The actual volume of fresh charge admitted in 4-stroke petrol engine is_________________?

The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be________________?