SSC JE Mechanical Engineering 22nd Jan 2018 Shift-1
For the following questions answer them individually
The magnitude of rise of pressure due to water hammer in a rigid and non-elastic pipe carrying water of density $$\rho$$ and bulk modules k will be equal to
A] $$\frac{k}{\sqrt{\rho}}$$ B] $$\sqrt{k \rho}$$ C] $$\sqrt{\frac{\rho}{k}}$$ D] $$\frac{k}{\rho}$$
The most economical section of circular channel for maximum discharge is obtained when (Where, d is the diameter of circular section)
Reynolds number for non-circular cross section is:
[V = mean velocity
v = kinematic viscosity
P = Ratio of cross sectional area to the wetter perimeter]
A] $$\frac{V.4P}{v}$$ B] $$\frac{V.P}{v}$$ C] $$\frac{V.2P}{4v}$$ D] $$\frac{V.P}{4v}$$
In case of a two dimensional flow the components of velocity are given by u = ax; v = by, the streamlines will consist of a series of
Time of flow from one tank in which water level is $$h_1$$ to another tank having level $$h_2$$ will be proportional to
A] $$h_1 - h_1$$ B] $$\sqrt{h_1 - h_2}$$ C] $$\sqrt{h_1} - \sqrt{h_2}$$ D] $$h_1^{\frac{3}{2}} - h_2^{\frac{3}{2}}$$
