Refrigeration and Air Conditioning
The C.O.P. of an absorption type refrigerator is given by (where T₁ = Temperature at which the working substance receives heat, T₂ = Temperature of cooling water, and T₃ = Evaporator temperature)

[T₁ (T₂ - T₃)] / [T₃ (T₁ - T₂)]
[T₃ (T₂ - T₃)] / [T₁ (T₁ - T₂)]
[T₃ (T₁ - T₂)]/ [T₁ (T₂ - T₃)]
[T₁ (T₁ - T₂)] / [T₃ (T₂ - T₃)]

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Refrigeration and Air Conditioning
A thermostatic expansion valve in a refrigeration system

Maintains different temperatures in evaporator in proportion to load
Is suitable only for constant load systems
Ensures the evaporator completely filled with refrigerant of the load
None of these

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Refrigeration and Air Conditioning
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature

Which lies between the dry bulb and wet bulb temperatures of the incoming stream
Which is lower than the dew point temperature of the incoming stream
Which lies between the wet bulb and dew point temperatures of the incoming stream
Of adiabatic saturation of incoming stream

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