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UPSC Civil Service Exam Questions - Engineering

Q1:

A flash mixer of 2.0 m3, with a velocity gradient of mixing mechanisms equal to 660/s, and fluid absolute viscosity of 1.0 x 10-3 Ns/m2 is continuously operated. What is the power input per unit volume ?

A 360 W

B 720 W

C 1440 W

D 300 W

ANS:B - 720 W

Velocity gradient G= (P/uV)^1/2)

Power input per unit volume P= uG^2V,
P= 1*10^-3*660^2*2,
P= 871.2.