Civil Engineering MCQAE Level Civil Engineering
A stream function psi = 4x^3 - y^2. The magnitude of velocity at point (1, 2) is
Fluid MechanicsFluid MechanicsMEDIUM
Choose the correct answer
A
12
B
12.65
C
1.265
D
16.25
Correct Answer
B. 12.65
Why is this the answer?
u = dpsi/dy = -2y = -4 and v = -dpsi/dx = -12x^2 = -12; resultant = sqrt(4^2+12^2) = 12.65
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.