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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)

w/h
wh
w
h/w

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

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

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Hydraulics and Fluid Mechanics in ME
For pipes, turbulent flow occurs when Reynolds number is

more than 4000
less than 4000
between 2000 and 4000
less than 2000

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Hydraulics and Fluid Mechanics in ME
The jet ratio is defined as the ratio of the

Velocity of jet to the velocity of Pelton wheel
Velocity of Pelton wheel to the velocity of jet
Diameter of jet to the diameter of Pelton wheel
Diameter of Pelton wheel to the diameter of jet

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Hydraulics and Fluid Mechanics in ME
The unit of dynamic viscosity in S.I. units is

N-s/m²
Stoke
Poise
N-m/s²

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Hydraulics and Fluid Mechanics in ME
The two important forces for a floating body are

buoyancy, gravity
inertial, gravity
buoyancy, pressure
buoyancy, inertial

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