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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The wet bulb depression indicates _________ humidity of the air.

Relative
None of these
Absolute
Specific

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

100 kJ/kg
125 kJ/kg
50 kJ/kg
25 kJ/kg

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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

Sulphur dioxide
Lithium bromide
Carbon dioxide
R-12

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Refrigeration and Air Conditioning
The material of pipe lines for a system using Freon as a refrigerant should be

Copper
Aluminium
Steel
Brass

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

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

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Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

Carbon dioxide
R-12
Ammonia
Sulphur dioxide

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