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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Puck up the wrong statement about centrifugal pump

Head a diameter
Discharge a diameter
Power a speed⁴
Head a speed²

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Hydraulics and Fluid Mechanics in ME
According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2 where m is equal to

0.003 + (H/0.405)
0.405 + (0.003/H)
0.003 + (0.405/H)
0.405 + (H/0.003)

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Hydraulics and Fluid Mechanics in ME
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

L
L/2
L/4
L/3

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Hydraulics and Fluid Mechanics in ME
Center of buoyancy is the

center of pressure of displaced volume
e.g. of floating body
centroid of the displaced volume of fluid
does not exist

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Hydraulics and Fluid Mechanics in ME
The major loss of energy in long pipes is due to

gradual contraction or enlargement
friction
sudden contraction
sudden enlargement

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Hydraulics and Fluid Mechanics in ME
The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

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

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