Refrigeration and Air Conditioning - Mechanical Engineering Questions and Answers

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The wet bulb temperature during sensible heating of air

Remains constant

Increases

Decreases

None of these

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

T₁ / (T₂ - T₁)

(T₂ - T₁)/T₁

(T₁ - T₂)/T₁

T₂/ (T₂ - T₁)

The relative coefficient of performance is equal to

(Theoretical C.O.P.)/ (Actual C.O.P.)

(Actual C.O.P.) /(Theoretical C.O.P.)

(Actual C.O.P.) × (Theoretical C.O.P.)

None of these

If a gas is to be liquefied, its temperature must be

Increased to a value above its critical temperature

Reduced to a value below its critical temperature

Equal to critical temperature

None of the above

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