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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Which of the following manometer has highest sensitivity

U-tube with mercury
inclined U-tube
U-tube with water
micro-manometer with water

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Hydraulics and Fluid Mechanics in ME
For laminar flow in circular pipes, the Darcy’s friction factor f is equal to

64/ Re
None of these
16/Re
32/ Re

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Hydraulics and Fluid Mechanics in ME
For starting an axial flow pump, its delivery valve should be

Closed
Depends on starting condition and flow desired
Open
Could be either open or closed

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Hydraulics and Fluid Mechanics in ME
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)

wH2/3
wH2/2
wH/2
wH

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Hydraulics and Fluid Mechanics in ME
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is

1.5 m3/s
0.5 m3/s
0.25 m3/s
2.5 m3/s

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Hydraulics and Fluid Mechanics in ME
The maximum thickness of boundary layer in a pipe of radius r is

r/2
2r
r

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