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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The velocity corresponding to Reynold number of 2000 is called

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

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Hydraulics and Fluid Mechanics in ME
The runaway speed of a hydraulic turbine is the speed

At full load
Corresponding to maximum overload permissible
At which there will be no damage to the runner
At which the turbine will run freely without load

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Hydraulics and Fluid Mechanics in ME
An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)

tanθ = a2/2g
tanθ = 2 a/g
tanθ = a/g
tanθ = a/2g

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Hydraulics and Fluid Mechanics in ME
A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is

28.9 kN
2.89 kN
9.28 kN
8.29 kN

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Hydraulics and Fluid Mechanics in ME
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

center of buoyancy
metacentre
center of gravity
center of pressure

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Hydraulics and Fluid Mechanics in ME
Alcohol is used in manometers because

It is clearly visible
It can provide longer column due to low density
It has low surface tension
It has low vapour pressure

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