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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For starting an axial flow pump, its delivery valve should be

Could be either open or closed
Depends on starting condition and flow desired
Open
Closed

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

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

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Hydraulics and Fluid Mechanics in ME
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)

d = (D⁵/8fl)1/3
d = (D⁵/8fl)1/2
d = (D⁵/8fl)1/5
d = (D⁵/8fl)1/4

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Hydraulics and Fluid Mechanics in ME
The rise or depression of liquid in a tube due to surface tension will increase in size of tube will

Remain unaffected
Decrease
Increase
May increase or decrease depending on the characteristics of liquid

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Hydraulics and Fluid Mechanics in ME
In a depressed nappe

The pressure below the nappe is atmospheric
The pressure above the nappe is atmospheric
The pressure above the nappe is negative
The pressure below the nappe is negative

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Hydraulics and Fluid Mechanics in ME
According to equation of continuity,

w1a1 = w2a2
a1/v1 = a2/v2
w1v1 = w2v2
a1v1 = a2v2

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