Aduct of rectangular cross-section 600 mm x 400 mm carries 90 m3/min o

1.	Aduct of rectangular cross-section 600 mm x 400 mm carries 90 m3/min of air having density of 1.2 kg/m3. When the quantity of air in both cases is same, the equivalent diameter of a circular duct will be nearly (a) 0.86 m (b) 0.76 m (c) 0.64 m (d) 0.54 m
Answer» (d) 0.54 m A₁ = A₂ 0.6 × 0.4 = \(\cfrac{\pi}4\) x D² = 0.55 m

Aduct of rectangular cross-section 600 mm x 400 mm carries 90 m3/min of air having density of 1.2 kg/m3. When the quantity of air in both cases is same, the equivalent diameter of a circular duct will be nearly (a) 0.86 m (b) 0.76 m (c) 0.64 m (d) 0.54 m

Answer»

(d) 0.54 m

A₁ = A₂

0.6 × 0.4 = \(\cfrac{\pi}4\) x D²

= 0.55 m

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Aduct of rectangular cross-section 600 mm x 400 mm carries 90 m3/min of air having density of 1.2 kg/m3. When the quantity of air in both cases is same, the equivalent diameter of a circular duct will be nearly (a) 0.86 m (b) 0.76 m (c) 0.64 m (d) 0.54 m

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