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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 ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?

A net efficiency

B efficiency ratio

C relative efficiency

D overall efficiency

Review Detailed Answer

Correct Answer: relative efficiency

In a diesel engine, the fuel is ignited by___________________?

A spark

B injected fuel

C heat resulting from compressing air that is supplied for combustion

D ignition

Review Detailed Answer

Correct Answer: heat resulting from compressing air that is supplied for combustion

The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?

A same

B less

C more

D more or less depending on power rating

Review Detailed Answer

Correct Answer: more

Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?

A yes

B no

C to some extent

D unpredictable

Review Detailed Answer

Correct Answer: no

Scavenging air in diesel engine means___________________?

A air used for combustion sent under pres-sure

B forced air for cooling cylinder

C burnt air containing products of combustion

D air used for forcing burnt gases out of engine’s cylinder during the exhaust period

Review Detailed Answer

Correct Answer: air used for forcing burnt gases out of engine’s cylinder during the exhaust period

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

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?

In a diesel engine, the fuel is ignited by___________________?

The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?

Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?

Scavenging air in diesel engine means___________________?

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_______________?