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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Ammonia is

Toxic and non-inflammable
Non-inflammable
Non-toxic
Highly toxic and inflammable

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Refrigeration and Air Conditioning
When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

Negative
None of the listed here
Zero
Positive

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Refrigeration and Air Conditioning
Superheating in a refrigeration cycle

Increases C.O.P
O.P remains unaltered
Other factors decide C.O.P
Decreases C.O.P

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Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

24 bars
Atmospheric pressure
Slightly above atmospheric pressure
56 bars

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Refrigeration and Air Conditioning
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

Carbon dioxide
Lithium bromide
Sulphur dioxide
R-12

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Refrigeration and Air Conditioning
The air cooling system mostly used in transport type aircrafts is

Bootstrap air cooling system
Simple evaporative air cooling system
All of the listed here
Simple air cooling system

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MORE MCQ ON Refrigeration and Air Conditioning

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