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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The wet bulb temperature during sensible cooling of air

Remains constant
Increases
None of these
Decreases

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Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m/hK
m²/h
m/h
m²/hK

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Refrigeration and Air Conditioning
An Electrolux refrigerator is called a ___ absorption system.

None of the listed here
Single fluid
Three fluids
Two fluids

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Refrigeration and Air Conditioning
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

(T₂ - T₁)/T₁
(T₁ - T₂)/T₁
T₁ / (T₂ - T₁)
T₂/ (T₂ - T₁)

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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

Positive
Zero
None of the listed here
Negative

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Refrigeration and Air Conditioning
The dry bulb temperature lines, on the psychrometric chart are

Vertical and uniformly spaced
Curved lines
Horizontal and non-uniformly spaced
Horizontal and uniformly spaced

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