SSC JE Mechanical Engineering 24th Jan 2018 Shift-1
Instructions
For the following questions answer them individually
Question 186
Stream and velocity potential functions for a two dimensional flowfield given by u = 2x and v = - 2y are
(a) $$\psi = 2xy, \phi = x^2 - y^2$$
(b) $$\psi = x^2 - y^2, \phi = 2xy$$
(c) $$\psi = x^2y^2, \phi = x^2 + y^2$$
(d) $$\psi = x^2 + y^2, \phi = x^2y^2$$
Question 189
The overall efficiency of a Pelton turbine is 70%. If the mechanical efficiency is 85%, whatis its hydraulic efficiency?
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