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Hydraulics and Fluid Mechanics in ME

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
The top of the weir over which the water flows is known as

None of these
Orifice
Nappe or vein
Sill or crest

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Hydraulics and Fluid Mechanics in ME
Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

0.392
0.848
0.492
0.688

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Hydraulics and Fluid Mechanics in ME
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

wA
wA/x
wAx
wx

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Hydraulics and Fluid Mechanics in ME
Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

(w Q) / (Hm × ηo)
(w Hm) / (Q × ηo)
(w Q ηo) / Hm
(w Hm Q) / ηo

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Hydraulics and Fluid Mechanics in ME
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

Q = π.b.Vf
Q = π.D.Vf
Q = π.D.bf.V
Q = D.b.Vf

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