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Mechanical Engineering Objective Questions { Refrigeration and Air Conditioning }

36. Absorption system normally uses the following refrigerant
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37. 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
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38. In a refrigeration system, heat absorbed in comparison to heat rejected is.
D.More for small capacity and less for high capacity
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39. 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 li
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40. 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
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41. 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)
D.Any value
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42. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to
A.Collect liquid refrigerant and prevent it from going to compressor '-
B.Detect liquid in vapour
C.Superheat the vapour
D.Collect vapours
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