The tangential velocity of the water element having a free vortex is

directly proportional to its distance from the centre
inversely proportional to its distance from the centre
directly proportional to its (distance)2 from the centre
inversely proportional
✅ The correct answer is option B.

The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p1 = Intake pressure of air, p2 = Intercooler pressure, and p3 = Delivery pressure of air)

p2 = p1 x p3
p2 = p1/p3
p2 = p1 x p3
p2 = p3/p1
✅ The correct answer is option C.