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Consider the following statements

            In measurement with a wet bulb thermometer

1. The wet bulb depression is an index relative humidity

            2. The thermometer bulb should be wrapped by moist cloth and it is necessary to dip the end of the

cloth in water

            3. Air is to flow at sufficiently low velocity past the thermometer bulb

            4. Dry bulb temperature will be equal to the wet bulb temperature when the air is completely dry.

            Which of these statements i/are correct?

            (a) 1 and 2       (b) 2 and 3       (c) 3 and 4       (d) 1only

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