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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

9: 1
1: 3
1: 1
1: 9

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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

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

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Refrigeration and Air Conditioning
During cooling and dehumidification, dry bulb temperature

Remains constant
Increases
None of these
Decreases

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Refrigeration and Air Conditioning
During adiabatic saturation process on unsaturated air ___ remains constant.

Dew point temperature
Dry bulb temperature
Wet bulb temperature
Relative humidity

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

Stirling
Ericson
Carnot
Bell Coleman

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

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