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Refrigeration and Air Conditioning

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

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

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Refrigeration and Air Conditioning
The capillary tube is not used in large capacity refrigeration systems because

Required pressure drop cannot be achieved
Cost is too high
Capacity control is not possible
It is made of copper

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Refrigeration and Air Conditioning
Air refrigerator works on

None of these
Reversed Carnot cycle
Bell Coleman cycle
Both (A) and (B)

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Refrigeration and Air Conditioning
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

5
1.2
6
0.2

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It reacts with copper and its alloys.
All of these
It is toxic to mucous membranes.
It requires large displacement per TR compared to fluoro carbons.

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Refrigeration and Air Conditioning
The difference between dry bulb temperature and wet bulb temperature, is called

Dew point depression
Dry bulb depression
Wet bulb depression
Degree of saturation

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