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UPSC Civil Service Exam Questions - Engineering

Q1:

If the velocity potential φ = 4 xy, what are the x and y components of velocity at the point(1, 4) ?

A u = - 16, v = - 4

B u = - 4, v = - 16

C u = 16, v = - 4

D u = 16, v = 16

ANS:A - u = - 16, v = - 4

U= -dφ/dx.
=-4y,
=-16.

V= -dφ/dy,
= -4x,
= -4.