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.

In a vapor compression cycle, the refrigerant immediately after expansion valve is___________________?

A liquid

B sub-cooled liquid

C saturated liquid

D wet vapour

Review Detailed Answer

Correct Answer: wet vapour

Highest temperature encountered in refrigeration cycle should be________________?

A near critical temperature of refrigerant

B above critical temperature

C at critica. temperature

D much below critical temperature

Review Detailed Answer

Correct Answer: much below critical temperature

One of the purposes of sub-cooling the liquid refrigerant is to________________?

A reduce compressor overheating

B reduce compressor discharge temperature

C increase cooling effect

D ensure that only liquid and not the vapour enters the expansion (throttling) valve

Review Detailed Answer

Correct Answer: ensure that only liquid and not the vapour enters the expansion (throttling) valve

In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?

A more

B less

C same

D more for small capacity and less for high capacity

Review Detailed Answer

Correct Answer: less

Formation of frost on evaporator in refrigerator ________________?

A results in loss of heat due to poor heat transfer

B increases heat transfer rate

C is immaterial

D can be avoided by proper design

Review Detailed Answer

Correct Answer: results in loss of heat due to poor heat transfer

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant_________________?

A decreases

B increases

C remains same

D depends on other factors

Review Detailed Answer

Correct Answer: increases

Which of the following is not a desirable property of a refrigerant_________________?

A high triiscibility with oil

B low boiling point

C good electrical conductor

D large latent heat

Review Detailed Answer

Correct Answer: good electrical conductor

Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?

A strong solution to weak solution

B weak solution to strong solution

C strong solution to ammonia vapour

D ammonia vapour to weak solution

Review Detailed Answer

Correct Answer: weak solution to strong solution

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

A same

B more

C less

D more/less depending on rating

Review Detailed Answer

Correct Answer: more

Highest pressure encountered in a refrigeration system should be________________?

A critical pressure of refrigerant

B much below critical pressure

C much above critical pressure

D near critical pressure

Review Detailed Answer

Correct Answer: much below critical pressure

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

In a vapor compression cycle, the refrigerant immediately after expansion valve is___________________?

Highest temperature encountered in refrigeration cycle should be________________?

One of the purposes of sub-cooling the liquid refrigerant is to________________?

In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?

Formation of frost on evaporator in refrigerator ________________?

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant_________________?

Which of the following is not a desirable property of a refrigerant_________________?

Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?

Highest pressure encountered in a refrigeration system should be________________?