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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

0.56
0.26
0.46
0.36

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Hydraulics and Fluid Mechanics in ME
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

High speed with radial flow at outlet
High speed with axial flow at outlet
Medium speed with radial flow at outlet
Slow speed with radial flow at outlet

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Hydraulics and Fluid Mechanics in ME
Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

Inversely proportional to N²
Directly proportional to N
Inversely proportional to N
Directly proportional to N²

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Hydraulics and Fluid Mechanics in ME
The velocity distribution for laminar flow through a circular tube

varies linearly from zero at walls to maximum at centre
varies parabolically with maximum at the centre
None of these
is constant over the cross-section

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Hydraulics and Fluid Mechanics in ME
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.

None of these
Increases
Decreases
Remain same

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Hydraulics and Fluid Mechanics in ME
The velocity corresponding to Reynold number of 2800, is called

Sub-sonic velocity
Super-sonic velocity
Lower critical velocity
Higher critical velocity

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