1.

Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

A. <i>d</i>
B. <span class="root"><i>d</i></span>
C. <span class="root">2 <i>d</i></span>
D. <span class="root">2<i>d</i></span>
Answer» B. <span class="root"><i>d</i></span>


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