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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

Nozzle
Mouthpiece
Notch
Weir

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Hydraulics and Fluid Mechanics in ME
A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is

7.5 kN/m3
10 kN/m3
4.5 kN/m3
6 kN/m3

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Hydraulics and Fluid Mechanics in ME
When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

Nearly horizontal
Horizontal
First rise and then fall
Steep

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Hydraulics and Fluid Mechanics in ME
Newton’s law of viscosity relates

shear stress, viscosity and temperature
intensity of pressure and rate of angular deformation
viscosity and rate of angular deformation
shear stress and rate of angular deformation

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Hydraulics and Fluid Mechanics in ME
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

(1 - sin φ)/2
(1 + sin φ)/2
(1 - cos φ)/2
(1 + cos φ)/2

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Hydraulics and Fluid Mechanics in ME
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

L/2
L
L/4
L/3

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