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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The unit of surface tension is

N-m
N/m
N/m3
N/m2

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

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

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Hydraulics and Fluid Mechanics in ME
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

v₁²/2g
v₂²/2g
0.375 v₂²/2g
0.5 v₁²/2g

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Hydraulics and Fluid Mechanics in ME
The unit of viscosity is

kg-sec/meter
Newton-sec per meter²
Meters² per sec
Newton-sec per meter

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Hydraulics and Fluid Mechanics in ME
For centrifugal pump impeller, the maximum value of the vane exit angle is

10° to 15°
15° to 20°
20° to 25°
25° to 30°

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

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

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