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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)

2p/sin (α/2)
2p/sinα
p/sinα
p/2sinα

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

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Hydraulics and Fluid Mechanics in ME
One cubic metre of water weighs

100 liters
250 liters
500 liters
1000 liters

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Hydraulics and Fluid Mechanics in ME
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84(L - 0.1nH)H5/2
1.84(L - nH)H2
1.84(L - 0.1nH)H3/2
1.84(L - nH)H3

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

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Hydraulics and Fluid Mechanics in ME
In order to avoid cavitation in centrifugal pumps

The suction pressure should be low
The suction pressure should be high
The delivery pressure should be high
The delivery pressure should be low

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