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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The coefficient of viscosity may be determined by

Orifice type viscometer
All of these
Capillary tube method
Rotating cylinder method

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Hydraulics and Fluid Mechanics in ME
The mercury does not wet the glass. This is due to the property of the liquid known as

Cohesion
Viscosity
Surface tension
Adhesion

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Hydraulics and Fluid Mechanics in ME
Centre of buoyancy always

remains above the centre of gravity
remains below the centre of gravity
coincides with the centroid of the volume of fluid displaced
coincides with the centre of gravity

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Hydraulics and Fluid Mechanics in ME
The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Cross-sectional area of jet in m², and V = Velocity of jet in m/s)

waV / g
waV² / g
waV / 2g
waV² / 2g

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Hydraulics and Fluid Mechanics in ME
Dynamic viscosity of most of the gases with rise in temperature

unpredictable
remains unaffected
decreases
increases

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Hydraulics and Fluid Mechanics in ME
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by

dQ/Q = 3 × (dH/H)
dQ/Q = 2 × (dH/H)
dQ/Q = 5/2 × (dH/H)
dQ/Q = 3/2 × (dH/H)

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