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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

decreases
increases
remains same
depends on other factors

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Refrigeration and Air Conditioning
The evolution of heat of solution takes place in ammonia absorption plant when

Ammonia vapour goes into solution
Weak solution mixes with strong solution
Ammonia vapour is driven out of solution
Lithium bromide mixes with ammonia

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Refrigeration and Air Conditioning
In a vapour compression cycle, the refrigerant immediately after expansion valve is

Saturated liquid
Sub-cooled liquid
Liquid
Wet vapour

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Refrigeration and Air Conditioning
The undesirable property of a refrigerant is

Non-flammable
Non-explosive
High boiling point
Non-toxic

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

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

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Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Ammonia and water
Ammonia and lithium bromide
Water and lithium bromide
Water and water

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MORE MCQ ON Refrigeration and Air Conditioning

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