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Refrigeration & Air-Conditioning MCQ - Multiple Choice Question and Answer

Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

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Question No : 1
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

Decreases
Increases
Remain same
Depends on other factors

Question No : 2
The relative coefficient of performance is equal to

(Theoretical C.O.P.)/ (Actual C.O.P.)
(Actual C.O.P.) /(Theoretical C.O.P.)
(Actual C.O.P.) × (Theoretical C.O.P.)
None of these

Question No : 3
Critical temperature is the temperature above which

A gas will never liquefy
A gas will immediately liquefy
Water will evaporate
Water will never evaporate

Question No : 4
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Dry bulb temperature
Wet bulb temperature
Dew point temperature
Specific humidity

Question No : 5
During sensible cooling of air, specific humidity

Remains constant
Increases
Decreases
None of these

Question No : 6
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Ammonia
Carbon dioxide
Freon
Brine

Question No : 7
Choose the correct statement

A refrigerant should have low latent heat
If operating temperature of system is low, then refrigerant with low boiling point should be used
Pre-cooling and sub-cooling bf refrigerant are same
Superheat and sensible heat of a refrigerant are same