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Refrigeration and Air Conditioning

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

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

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

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

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Refrigeration and Air Conditioning
Carbon dioxide is

Colourless
All of the listed here
Non-flammable
Odourless

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Refrigeration and Air Conditioning
The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is

Bigger
Equal
Smaller
Smaller/bigger depending on capacity

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

Wet vapour
Liquid
Saturated liquid
Sub-cooled liquid

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Refrigeration and Air Conditioning
The C.O.P. of a heat pump working on a reversed Carnot cycle is

T₂/(T₂ - T₁)
T₁/(T₂ - T₁)
(T₂ - T₁)/T₁
(T₁ - T₂)/T₁

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