Question

Calculate area of a pipe if, flow rate is 20 l/min and flow velocity is 5 cm/s.

(a) 66.66 cm^2

(b) 60 cm^2

(c) 62 cm^2

(d) 64 cm^2

I got this question during an interview.

Enquiry is from Pipes, Valves and Fittings topic in chapter Building Blocks of Dairy Processing of Dairy Engineering

Answer 1

Correct option is (a) 66.66 cm^2

To explain I would say: Flow rate  = 20 litre/min

      = 200000 cm^3/60s

     = 333.33 cm^3/s

   Flow Rate = Velocity x Area

   333.33cm3/s = 5cm/s x Area

   Area = 333.33cm^3/s / 5 cm/s

   = 66.66 cm^2.