A duct of rectangular cross-section 600mm X 400mm carries 90 m3/min of air having a density of 1.2 kg/m3. Determine the equivalent diameter of a circular duct, (a) when the quantity of air carried in both the cases is the same; and (b) when the velocity of air in both the cases is the same. If friction factor is 0.011, find the pressure loss per 100 m length of duct. Group of answer choices 537 mm; 480mm; 21.9 mm of water 750 mm; 408mm; 12.9 mmof water 573 mm; 840mm; 29.1 mmof water 735 mm; 804mm; 91.2 mmof water

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