Evaporative air-cooler used effectively when:

1.	Evaporative air-cooler used effectively when:
A.	dry-bulb temperature is very close to the wet bulb temperature
B.	dry-bulb temperature is high and relative humidity is high
C.	dry-bulb temperature is low and relative humidity is high
D.	dry-bulb temperature is high and the relative humidity is low.
Answer» E.

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Evaporative air-cooler used effectively when:

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