Answer / gurmeet singh

The air flow rate at suction pipe is= (Area of suction pipe)
*(Velocity of air at suction pipe)

We know that area of suction pipe = pie/4 * D*D

Where D= 500 mm

So area of suction pipe = 196250 mm2

Know we have to assume that velocity at suction pipe ens is
just equal to the velocity in impeller.
Velocity of impeller= pie*D*N/60
= 117750 mm/sec

So air flow rate = 196250*117750
= 23108437500 mm3/sec

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