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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The difference between dry bulb temperature and wet bulb temperature, is called

Dew point depression
Dry bulb depression
Wet bulb depression
Degree of saturation

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is___ dry bulb temperature.

Lower than
Higher than
None of the listed here
Same as

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid

Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
After passing through the condenser

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

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Refrigeration and Air Conditioning
Pressure of water vapour is given by

None of these
μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
0.622 Pv/ (Pb - Pv)

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Carbon dioxide
Ammonia
R-12
Sulphur dioxide

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MORE MCQ ON Refrigeration and Air Conditioning

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