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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are

equal
less at low temperature and more at high temperature
more
less

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Hydraulics and Fluid Mechanics in ME
Bulk modulus of a fluid is the ratio of

Critical velocity to the viscosity of fluid
Increase in volume to the viscosity of fluid
Increase in pressure to the volumetric strain
Shear stress to shear strain

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Hydraulics and Fluid Mechanics in ME
Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in meters, and Hd = Delivery head in meters)

wQHd
wQHs
wQ (Hs + Hd)
wQ (Hs - Hd)

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Hydraulics and Fluid Mechanics in ME
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is

7.141 H5/2
1.417 H5/2
4.171 H5/2
0.417 H5/2

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Hydraulics and Fluid Mechanics in ME
Francis turbine is best suited for

Low head installation up to 30 m
Medium head application from 24 to 180 m
All types of heads
High head installation above 180 m

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Hydraulics and Fluid Mechanics in ME
A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is

15 kN
5kN
20 kN
lOkN

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