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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Ammonia is

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

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Increases heat transfer rate
Is immaterial
Can be avoided by proper design
Results in loss of heat due to poor heat transfer

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Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Much below critical pressure
Critical pressure of refrigerant
Near critical pressure
Much above critical pressure

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Refrigeration and Air Conditioning
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called

Absolute humidity
Relative humidity
Humidity ratio
Degree of saturation

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Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Halide torch which on detection produces greenish flame lighting
Smelling
Using reagents
Sulphur sticks which on detection gives white smoke

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Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 + C.O.P
1 + (1/C.O.P)
1 - (1/C.O.P)
1 - C.O.P.

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MORE MCQ ON Refrigeration and Air Conditioning

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