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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.

Evaporator
Expansion valve
Compressor
Condenser

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Refrigeration and Air Conditioning
The refrigerant supplied to a compressor must be

Dry saturated liquid refrigerant
None of these
Superheated vapour refrigerant
A mixture of liquid and vapour refrigerant

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Refrigeration and Air Conditioning
In a vapour compression system, the condition of refrigerant before passing through the condenser is

Dry saturated vapour
Superheated vapour
Wet vapour
Saturated liquid

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Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Aluminium
Copper
Steel
Brass

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Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

(Actual C.O.P.) /(Theoretical C.O.P.)
(Theoretical C.O.P.)/ (Actual C.O.P.)
None of these
(Actual C.O.P.) × (Theoretical C.O.P.)

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Refrigeration and Air Conditioning
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

P.F. - 1
1/ B.P.F.
1 + B.P.F.
1 - B. P.F.

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