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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.

In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?

A high, of the order of 25°

B as low as possible (3 to 11°C)

C zero

D any value

Review Detailed Answer

Correct Answer: as low as possible (3 to 11°C)

Condensing temperature in a refrigerator is the temperature_________________?

A of cooling medium

B of freezing zone

C of evaporator

D at which refrigerant gas becomes liquid

Review Detailed Answer

Correct Answer: at which refrigerant gas becomes liquid

The value of COP in vapour compression cycle is usually__________________?

A always less than unity

B always more than unity

C equal to unity

D any one of the above

Review Detailed Answer

Correct Answer: always more than unity

In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?

A less than 2 kg

B more than or equal to 3.65 kg

C more than 10 kg

D there is no such consideration

Review Detailed Answer

Correct Answer: more than or equal to 3.65 kg

Critical pressure of a liquid is the pressure_________________?

A above which liquid will remain liquid

B above which liquid becomes gas

C above which liquid becomes vapour

D above which liquid becomes solid

Review Detailed Answer

Correct Answer: above which liquid will remain liquid

The vapor pressure of refrigerant should be_________________?

A lower than atmospheric pressure

B higher than atmospheric pressure

C equal to atmospheric pressure

D could be anything

Review Detailed Answer

Correct Answer: higher than atmospheric pressure

The bank of tubes at the back of domestic refrigerator are _________________?

A condenser tubes

B evaporator tubes

C refrigerant cooling tubes

D capillary tubes

Review Detailed Answer

Correct Answer: condenser tubes

Air refrigeration cycle is used in ____________________?

A domestic refrigerators

B commercial refrigerators

C air conditioning

D gas liquefaction

Review Detailed Answer

Correct Answer: gas liquefaction

For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be____________________?

A small

B high

C euqal

D anything

Review Detailed Answer

Correct Answer: small

Refrigeration in aeroplanes usually employs the following refrigerant___________________?

A Co2

B Freon-11

C Freon-22

D Air

Review Detailed Answer

Correct Answer: Air

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?

Condensing temperature in a refrigerator is the temperature_________________?

The value of COP in vapour compression cycle is usually__________________?

In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?

Critical pressure of a liquid is the pressure_________________?

The vapor pressure of refrigerant should be_________________?

The bank of tubes at the back of domestic refrigerator are _________________?

Air refrigeration cycle is used in ____________________?

For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be____________________?

Refrigeration in aeroplanes usually employs the following refrigerant___________________?