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Refrigeration and Air Conditioning - Interview Questions and Answers

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56. Critical temperature is' the temperature above which
A. a gas will never liquefy
B. a gas will immediately liquefy
C. water will evaporate
D. water will never evaporate
E. none of the above.
Explanation:
57. 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
E. sensing reduction in pressure.
Explanation:
58. Super heating in a refrigeration cycle
A. increases COP
B. decreases COP
C. COP remains unaltered
D. other factors decide COP
E. unpredictable.
Explanation:
59. Short horizontal lines on pressure-enthalpy chart show
A. constant pressure lines
B. constant temperature lines
C. constant total heat lines
D. constant entropy lines
E. constant volume lines.
Explanation:
60. Efficiency of a Cornot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle
A. 1.25
B. 0.8
C. 0.5
D. 0.25
E. none of the above.
Explanation:
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