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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In a domestic vapour compression refrigerator, the refrigerant commonly used is

Ammonia
R-12
All of these
CO?

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Refrigeration and Air Conditioning
The advantage of dry compression is that

All of these
It permits higher speeds to be used
It permits complete evaporation in the evaporator
It results in high volumetric and mechanical efficiency

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

8 bar
30 bar
2 bar
15 bar

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Refrigeration and Air Conditioning
The temperature of ammonia after compression in a vapour compression system is

70 to 110°C
50 to 70°C
20 to 50°C
None of these

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Refrigeration and Air Conditioning
Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system

Strong solution to weak solution
Ammonia vapours to weak solution
Weak solution to strong solution
Strong solution to ammonia vapour

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Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

R-12
Carbon dioxide
Sulphur dioxide
Ammonia

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