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Mechanical Engineering Objective Questions { Refrigeration and AC }



36. Absorption system normally uses the following refrigerant
A.Freon-11
B.Ammonia.
C.CO2'
D.SO2

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

38. In a refrigeration system, heat absorbed in comparison to heat rejected is.
A.More
B.Less
C.Same
D.More for small capacity and less for high capacity

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

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

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)
C.Zero
D.Any value

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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