Question

Refer to Q7 and Q8, and determine the agitator speed in appropriate units for power calculation.

(a) 3 rps

(b) 1 rps

(c) 6 rps

(d) 4 rps

I got this question in a national level competition.

I want to ask this question from Power Requirements for Mixing topic in chapter Fluid Flow and Mixing of Bioprocess Engineering

Answer 1

Correct choice is (b) 1 rps

For explanation I would say: N = revolutions per sec (rps). The agitation speed is given in the example as 60 revolutions per minute, which when divided by 60 seconds/minute yields:

N = 60 rpm / 60 = 1 rps.