20 Questions MCQ Test Mock Test Series of SSC JE Civil Engineering - Test: Fluid Mechanics- 2
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Detailed Solution for Test: Fluid Mechanics- 2 - Question 7
1. Flows become turbulent due to differences in velocity inside them, and the flow resistance increases. This resistive force acting on flows due to turbulence is called the Reynolds stress. This is an imaginary force that appears when flow fields are seen with coarse graining by time-averaging.
2. Viscosity, the proportionality constant of viscous force, is a physical quantity dependent on the type of material, while eddy viscosity is a physical quantity dependent on the state of flow.
Detailed Solution for Test: Fluid Mechanics- 2 - Question 10
An orifice is a small aperture through which the fluid passes. The thickness of an orifice in the direction of flow is very small in comparison to its other dimensions. An orifice is said to be large, if the available head of liquid is less than 5 times the height of orifice.
In order, to avoid separation in Venturi meter the angle of divergence is kept
Detailed Solution for Test: Fluid Mechanics- 2 - Question 11
In the diverging portion there is a decrease in velocity & subsequent increase in pressure. If divergence angle is very large, then back pressure will increase by great extent & eddies formation will take place resulting in flow separation. Thus, to avoid flow separation the divergence angle must not exceed more than 7° and range should be around 5 - 7°.
The flow of water in a wash hand basin when it is being emptied through a central opening, is an example of
Detailed Solution for Test: Fluid Mechanics- 2 - Question 18
In a free vortex flow total mechanical energy remains constant. There is neither any energy interaction between an outside source and the flow, nor is there any dissipation of mechanical energy within the flow. The fluid rotates by virtue of some rotation previously imparted to it or because of some internal action.
Some examples are a whirlpool in a river, the rotatory flow that often arises in a shallow vessel when liquid flows out through a hole in the bottom (when water flows out from a bathtub or a wash basin), and flow in a centrifugal pump case just outside the impeller.
A compound pipe of diameters d1, d2 and d3 having length l1, l2 and l3 respectively is to be replaced by an equivalent pipe of uniform diameter d and length l. The size of the equivalent pipe is given by
Detailed Solution for Test: Fluid Mechanics- 2 - Question 19
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