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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
remains same
increases
depends on other factors

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

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

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Refrigeration and Air Conditioning
Condensing temperature in a refrigerator is the temperature

Of freezing zone
Of evaporator
At which refrigerant gas becomes liquid
Of cooling medium

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Refrigeration and Air Conditioning
Which of the following cycles uses air as the refrigerant?

Carnot
Bell Coleman
Stirling
Ericson

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Refrigeration and Air Conditioning
The higher temperature in vapour compression cycle occurs at

Expansion valve
Compressor discharge
Receiver
Evaporator

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Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

Increases C.O.P
Other factors decide C.O.P
O.P remains unaltered
Decreases C.O.P

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