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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Superheating in a refrigeration cycle

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

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Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

Cooled and humidified
Heated and dehumidified
Heated and humidified
Cooled and dehumidified

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Refrigeration and Air Conditioning
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

Automatic expansion valve
Low side float valve
Thermostatic expansion valve
High side float valve

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Refrigeration and Air Conditioning
In a domestic vapour compression refrigerator, the refrigerant commonly used is

Ammonia
CO?
R-12
All of these

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Refrigeration and Air Conditioning
The pressure at the inlet of a refrigerant compressor is called

Suction pressure
Critical pressure
Discharge pressure
Back pressure

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Refrigeration and Air Conditioning
The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

O.P.)P = (
(
O.P)R
O.P.)R + 2
O.P)P = (
O.P.)P = (
O.P)P = (
O.P.)R + 1
(
O.P)R - 1
(
(

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