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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The eddy viscosity for turbulent flow is

dependent on the flow
a physical property of the fluid.
a function of temperature only
independent of the flow

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Hydraulics and Fluid Mechanics in ME
A flow is called super-sonic if the

Discharge is difficult to measure
None of these
Velocity of flow is very high
Mach number is between 1 and 6

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Hydraulics and Fluid Mechanics in ME
For centrifugal pump impeller, the maximum value of the vane exit angle is

20° to 25°
25° to 30°
10° to 15°
15° to 20°

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Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

(2/3) Cd × b × √(2g) × H3/2
(2/3) Cd × b × √(2gH)
(2/3) Cd × b × √(2g) × H
(2/3) Cd × b × √(2g) × H2

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Hydraulics and Fluid Mechanics in ME
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

0.884
0.848
0.488
0.392

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Hydraulics and Fluid Mechanics in ME
The units of dynamic or absolute viscosity are

newton-sec² per meter
newton-sec per meter
kg sec/meter
metres² per sec

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