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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The overall efficiency for a Pelton wheel lies between

0.65 to 0.75
0.50 to 0.65
0.85 to 0.90
0.75 to 0.85

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

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

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Hydraulics and Fluid Mechanics in ME
The velocity at which the flow changes from laminar flow to turbulent flow is called

Sub-sonic velocity
Velocity of approach
Critical velocity
Super-sonic velocity

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Hydraulics and Fluid Mechanics in ME
The ratio of absolute viscosity to mass density is known as

viscosity index
kinematic viscosity
specific viscosity
coefficient of viscosity

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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

First rise and then fall
Nearly horizontal
Steep
Horizontal

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Hydraulics and Fluid Mechanics in ME
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre

Coincides with its centre of gravity
Lies below its centre of gravity
Lies between the centre of buoyancy and centre of gravity
Lies above its centre of gravity

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