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 change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?

A more

B less

C equally.

D unpredictable

Review Detailed Answer

Correct Answer: more

Which of the following refrigerants has lowest freezing point_______________?

A Freon-12

B NH3

C C02

D Freon-22

Review Detailed Answer

Correct Answer: Freon-22

The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?

A same

B more

C less

D more or less depending on ambient conditions

Review Detailed Answer

Correct Answer: less

Most of the domestic refrigerators work on the following refrigeration system _________________?

A vapour compression

B vapour absorption

C carnot cycle

D electrolux refrigerator

Review Detailed Answer

Correct Answer: vapour compression

The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?

A increase

B decrease

C remain unaffected

D may increase or decrease depending on the type of refrigerant used

Review Detailed Answer

Correct Answer: increase

For obtaining high COP, the pressure range of compressor should be_______________?

A high

B low

C optimum

D any value

Review Detailed Answer

Correct Answer: low

Super heating in a refrigeration cycle __________________?

A increases COP

B decreases COP

C COP remains unaltered

D other factors decide COP

Review Detailed Answer

Correct Answer: decreases COP

Moisture in freon refrigeration system causes________________?

A ineffective refrigeration

B high power consumption

C freezing automatic regulating valve

D corrosion of whole system

Review Detailed Answer

Correct Answer: freezing automatic regulating valve

The leaks in a refrigeration system using Freon are detected by____________________?

A halide torch which on detection produces greenish flame lighting

B sulphur sticks which on detection gives white smoke

C using reagents

D smelling

Review Detailed Answer

Correct Answer: halide torch which on detection produces greenish flame lighting

In vapour compression cycle using NH3 as refrigerant, initial charge is filled at_________________?

A suction of compressor

B delivery of compressor

C high pressure side close to receiver

D low pressure side near receiver

Review Detailed Answer

Correct Answer: high pressure side close to receiver

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?

Which of the following refrigerants has lowest freezing point_______________?

The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is_________________?

Most of the domestic refrigerators work on the following refrigeration system _________________?

The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?

For obtaining high COP, the pressure range of compressor should be_______________?

Super heating in a refrigeration cycle __________________?

Moisture in freon refrigeration system causes________________?

The leaks in a refrigeration system using Freon are detected by____________________?

In vapour compression cycle using NH3 as refrigerant, initial charge is filled at_________________?