SSC JE Mechanical Engineering 24th Jan 2018 Shift-1

Instructions

For the following questions answer them individually

Question 181

If a thin plate is held normal to the flow, the viscous drag onit is

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Question 182

The cross section of cippoletti weir is

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Question 183

When thereis no air left blow the nappe,it is known as

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Question 184

In case of reaction turbine

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Question 185

The overall efficiency of Pelton wheel is about

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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) $$\psi = x^2 + y^2, \phi = x^2y^2$$

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Question 187

Which one of the statementsis correct for a forced vortex?

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Question 188

Why is multi-staging in centrifugal pumps used?

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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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Question 190

Which of the following water turbines does not require a draft tube?

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