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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

None of the listed here
Zero
Negative
Positive

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Refrigeration and Air Conditioning
The superheating in a refrigeration cycle

Does not alter C.O.P.
Increases C.O.P.
None of these
Decreases C.O.P.

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Refrigeration and Air Conditioning
The temperature of ammonia after compression in a vapour compression system is

50 to 70°C
None of these
20 to 50°C
70 to 110°C

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Refrigeration and Air Conditioning
In aircraft, air refrigeration Cycle is used because of

Low weight per tonne of refrigeration
Low temperature at high altitudes
High heat transfer rate
Higher coefficient of performance

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Refrigeration and Air Conditioning
The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)
(hA - h1)/ (h2 - h1)
(h1 - h2)/ (hA - h2)

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

cooling below 0°C
very little power consumption
quiet operation
noisy operation

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MORE MCQ ON Refrigeration and Air Conditioning

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