UPSC Civil Service Exam Questions - Engineering

Q1:

Two small orifices A and B of diameters 1 cm and 2 cm, respectively, are placed on the sides of a tank at depths of h1 and h2 below the open liquid surface. If the discharges through A and B are equal, then the ratio of h1 and h2 (assuming equal Cd values) will be

A 16 : 1

B 8 : 1

C 4 : 1

D 2 : 1

ANS:A - 16 : 1

Since discharge remains constant.

Q1 = Q2,
A1 v1 = A2 V2,
Substitute the equation.
A1/A2 = (√h2/√h1).