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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The specific weight of water in S.I. units is taken as

9.81 kN/m3
Any one of these
9.81 × 103 N/m3
9.81 × 10-6 N/mm3

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Hydraulics and Fluid Mechanics in ME
In a free nappe,

The pressure above the nappe is negative
The pressure below the nappe is atmospheric
The pressure below the nappe is negative
The pressure above the nappe is atmospheric

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Hydraulics and Fluid Mechanics in ME
If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by

H = Hg/hf
H = Hg × hf
H = Hg - hf
H = Hg + hf

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

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

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Hydraulics and Fluid Mechanics in ME
In series-pipe problems

a trial solution is not necessary
the discharge is same through each pipe
the discharge through each pipe is added to obtain total discharge
the head loss is same through each pipe

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Hydraulics and Fluid Mechanics in ME
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

High speed with radial flow at outlet
Medium speed with radial flow at outlet
High speed with axial flow at outlet
Slow speed with radial flow at outlet

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