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Refrigeration and Air Conditioning - Interview Questions and Answers

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16. 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
E. at which all the three phases exist together.
Explanation:
17. An important characteristic of absorption system of refrigeration is
A. noisy operation
B. quiet operation
C. cooling below 0�C
D. very little power consumption
E. its input only in the form of heating.
Explanation:
18. Air refrigeration operates on
A. Carnot cycle
B. Reversed Carnot cycle
C. Rankine cycle
D. Erricson cycle
E. Brayton cycle.
Explanation:
19. 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
E. none of the above.
Explanation:
20. 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
E. decreases compressor power.
Explanation:
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