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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The impeller of a centrifugal pump may have

Vortex casing
Volute casing
Volute casing with guide blades
Any one of these

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Hydraulics and Fluid Mechanics in ME
A body floats in stable equilibrium

When its e.g. is below its center of buoyancy
When the metacentre is above e.g.
Metacentre has nothing to do with position of e.g. for determining stability
When its meatcentric height is zero

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Hydraulics and Fluid Mechanics in ME
When the velocity distribution is uniform over the cross-section, the correction factor for momentum is

1
2
43924

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Hydraulics and Fluid Mechanics in ME
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

(1 + sin φ)/2
(1 - cos φ)/2
(1 + cos φ)/2
(1 - sin φ)/2

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Hydraulics and Fluid Mechanics in ME
An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is

9 m/sec
9.75 m/sec²
10 m/sec²
9.81 m/sec²

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Hydraulics and Fluid Mechanics in ME
An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be

4 kN/m2
10 kN/m2
12 kN/m2
14 kN/m2

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