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UPSC Civil Service Exam Questions - Engineering

Q1:

a grit chamber of dimensions 12.0 m x 1.50 x 800 m liquid depth has a flow of 720 m3/hr. Its surface loading rate and detention time are, respectively,

A 40000 m3/hr/m2 and 1.2 minute

B 40000 1 ph/m2 and 40 minutes

C 40 m/hr/m2 and 12 minutes

D 40000 1 ph/m2 and 1.2 minute

ANS:D - 40000 1 ph/m2 and 1.2 minute

Option D is correct.
Q/l*b = 720/12*1.5= 40 m3/hr/m2= 40000 l/hr/m2.
v/q= (12*1.5*.8/720) *60 = 1.2min.