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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 working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft___________________?

A 1/2

B 1

C 2

D 4

Review Detailed Answer

Correct Answer: 2

The knock in diesel engine occurs due to____________________?

A instantaneous and rapid burning of the first part of the charge

B instantaneous atuo iginition of last part of charge

C delayed burning of the first part of the charge

D reduction of delay period

Review Detailed Answer

Correct Answer: instantaneous and rapid burning of the first part of the charge

A diesel engine has_________________?

A 1 valve

B 2 valves

C 3 valves

D 4 valves

Review Detailed Answer

Correct Answer: 3 valves

Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided__________________?

A it is properly designed

B best quality fuel is used

C can not work as it is impossible

D flywheel size is proper

Review Detailed Answer

Correct Answer: can not work as it is impossible

A hmh flame speed is obtained in diesel engine when air fuel ratio is_______________?

A uniform throughout the mixture

B chemically correct mixture

C about 3-5% rich mixture

D about 10% rich mixture

Review Detailed Answer

Correct Answer: about 10% rich mixture

Volatility of diesel fuel oil is_________________?

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

A 5 BHP engine running at full load would consume diesel of the order of_________________?

A 0.3 kg/hr

B 1 kg/hr

C 3 kg/hr

D 5 kg/hr

Review Detailed Answer

Correct Answer: 1 kg/hr

The following volume of air is required for consuming 1 liter of fuel by a four stroke engine_______________?

A 1 m3

B 5 m3

C 5-6 m3

D 9-10 m3

Review Detailed Answer

Correct Answer: 9-10 m3

Air fuel ratio at which a petrol engine can not work is_________________?

A 8 : 1

B 10 : 1

C 15 : 1

D 20 : 1 and less

Review Detailed Answer

Correct Answer: 20 : 1 and less

The theoretically correct air fuel ratio for petrol engine is of the order of___________________?

A 6 : 1

B 9 : 1

C 12 : 1

D 15 : 1

Review Detailed Answer

Correct Answer: 15 : 1

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft___________________?

The knock in diesel engine occurs due to____________________?

A diesel engine has_________________?

Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided__________________?

A hmh flame speed is obtained in diesel engine when air fuel ratio is_______________?

Volatility of diesel fuel oil is_________________?

A 5 BHP engine running at full load would consume diesel of the order of_________________?

The following volume of air is required for consuming 1 liter of fuel by a four stroke engine_______________?

Air fuel ratio at which a petrol engine can not work is_________________?

The theoretically correct air fuel ratio for petrol engine is of the order of___________________?