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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Non-flammable
Colourless
All of the listed here
Odourless

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Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

High pressure side close to receiver
Suction of compressor
Delivery of compressor
Low pressure side near receiver

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Refrigeration and Air Conditioning
The domestic refrigerator uses following type of compressor

Centrifugal
Axial
Miniature sealed unit
Piston type reciprocating

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Refrigeration and Air Conditioning
Critical pressure of a liquid is the pressure

Above which liquid becomes vapour
Above which liquid will remain liquid
Above which liquid becomes solid
Above which liquid becomes gas

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Refrigeration and Air Conditioning
The power per tonne of refrigeration is

None of these
3.5 × C.O.P.
O.P/3.5
3.5/C.O.P.

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Refrigeration and Air Conditioning
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

Normal cooling
Super-cooling
None of the listed here
Sub-cooling or under-cooling

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