Refrigeration and Air Conditioning
The minimum temperature to which water can be cooled in a cooling tower is

Dew point temperature of air
Dry bulb temperature of air
Ambient air temperature
Wet bulb temperature of air

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Refrigeration and Air Conditioning
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

It considerably reduces mass of the system
It improves the C.O.P., as the condenser is small
The positive work in isentropic expansion of liquid is very small
It leads to significant cost reduction

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

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

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