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Consider the following statements

            1. Effective temperature is an empirical index of  warmth that takes into account the effect of

temperature humidity and air movement

            2. Effective temperature is not a true comfort index as it does not consider the radiation effect of

surrounding surfaces

            3. It is the best comfort index for still air condition with 30% to 70% relative humidity

            Which of these statements is/are correct?

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

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