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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The dynamic viscosity of gases __________ with rise in temperature.

Remain unaffected
Decreases
Increases
None of these

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Hydraulics and Fluid Mechanics in ME
According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.

Directly proportional
Inversely proportional
Equal to
None of these

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Hydraulics and Fluid Mechanics in ME
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

0.375 v₂²/2g
0.5 v₁²/2g
v₂²/2g
v₁²/2g

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Hydraulics and Fluid Mechanics in ME
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

The same as the surface of liquid
Lower than the surface of liquid
Higher than the surface of liquid
Unpredictable

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Hydraulics and Fluid Mechanics in ME
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called

Up-thrust
Metacentre
Buoyancy
Reaction

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Hydraulics and Fluid Mechanics in ME
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

A1/2 × M2/3 × m × i
A × M × m2/3 × i1/2
A × M × m1/2 × i2/3
A2/3 × M1/3 × m × i

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