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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The flow in a pipe is turbulent when Reynold number is

Less than 2000
More than 2800
Between 2000 and 2800
None of these

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Hydraulics and Fluid Mechanics in ME
When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.

Equal to
None of these
Less than
More than

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Hydraulics and Fluid Mechanics in ME
Which place in hydraulic turbine is most susceptible for cavitations?

Guide blade
Blade inlet
Inlet of draft rube
Penstock

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

μπ²NR⁴/60t
μπ²NR/60t
μπ²NR²/60t
μπ²NR³/60t

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Hydraulics and Fluid Mechanics in ME
The coefficient of discharge for an external mouthpiece is

0.707
0.5
0.375
0.855

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Hydraulics and Fluid Mechanics in ME
The specific speed of a turbine is given by the equation

N√P / H²
N√P / H3/2
N√P / H5/4
N√P / H3

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