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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.

Solid injection in I.C. engines refers to injection of________________?

A liquid fuel only

B liquid fuel and air

C solid fuel

D solid fuel and air

Review Detailed Answer

Correct Answer: liquid fuel only

The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?

A lean mixture

B chemically correct mixture

C rich mixture

D unpredictable

Review Detailed Answer

Correct Answer: rich mixture

The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?

A more

B less

C same

D more upto some load and then less

Review Detailed Answer

Correct Answer: less

Exhaust pipes of engines are covered with insulating marterial in order to_________________?

A keep the exhaust pipes warm

B reduce formation of condenstae

C reduce heat transfer to the engine room

D increase engine efficiency

Review Detailed Answer

Correct Answer: reduce heat transfer to the engine room

Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The minimum value occurs in the region of________________?

A Lean mixture

B Chemically correct fuel air ratio

C Rich mixture

D Unpredictable

Review Detailed Answer

Correct Answer: Chemically correct fuel air ratio

Diesel engines as compared to petrol engines require ______________________?

A bigger flywheel

B smaller flywheel

C same size flywheel

D no flywheel

Review Detailed Answer

Correct Answer: bigger flywheel

The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?

A lean mixture

B chemically correct mixture

C rich mixture

D unpredictable

Review Detailed Answer

Correct Answer: lean mixture

Air injection in I.C. engines refers to injection of___________________?

A air only

B liquid fuel only

C liquid fuel and air

D supercharging

Review Detailed Answer

Correct Answer: liquid fuel and air

With increase in speed of vehicle, the back pressure will________________?

A decrease

B increase

C remain unalfected

D depend on other factors

Review Detailed Answer

Correct Answer: increase

A 4-stroke diesel engine needs about following amount of air_________________?

A 75 cc per min. per h.p.

B 750 cc per min. per h.p.

C 7500 cc per min. per h.p.

D 75000 cc per min. per h.p.

Review Detailed Answer

Correct Answer: 75000 cc per min. per h.p.

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Solid injection in I.C. engines refers to injection of________________?

The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?

The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?

Exhaust pipes of engines are covered with insulating marterial in order to_________________?

Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The minimum value occurs in the region of________________?

Diesel engines as compared to petrol engines require ______________________?

The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?

Air injection in I.C. engines refers to injection of___________________?

With increase in speed of vehicle, the back pressure will________________?

A 4-stroke diesel engine needs about following amount of air_________________?