Refrigeration and Air Conditioning Quiz | Refrigeration and Air Conditioning Short Questions and Answers
Questions
41
Which of the following is not a desirable property of a refrigerant
Answer: good electrical conductor
42
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be
Answer: 5
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43
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
Answer: increases
44
Accumulators should have adequate volume to store refrigerant charge at least
Answer: 50%
45
In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to
Answer: collect liquid refrigerant and prevent it from going to compressor
46
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be
Answer: as low as possible (3 to 11°C)
47
Formation of frost on evaporator in refrigerator
Answer: results in loss of heat due to poor heat transfer
48
Condensing temperature in a refrigerator is the temperature
Answer: at which refrigerant gas becomes liquid
49
In a refrigeration system, heat absorbed in comparison to heat rejected is
Answer: less
50
The value of COP in vapour compression cycle is usually
Answer: always more than unity
51
One of the purposes of sub-cooling the liquid refrigerant is to
Answer: ensure that only liquid and not the vapour enters the expansion (throttling) valve
53
An important characteristic of absorption system of refrigeration is
Answer: Quiet operation
54
Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
Answer: Capillary tube
55
The fluids used in Electrolux refrigerator are
Answer: Ammonia, water and hydrogen
56
The COP of a vapour compression plant in comparison to vapour absorption plant is
Answer: More
57
In a lithium bromide absorption refrigeration system
Answer: Water is used as a refrigerant and lithium bromide as an absorbent
58
The bank of tubes at the back of domestic refrigerator is
Answer: Condenser tubes
59
The vapour compression refrigerator employs the following cycle
Answer: Reversed Carnot
60
In a refrigeration system, the expansion device is connected between the
Answer: Receiver and evaporator
