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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by

0.15
0.1
0.05
0.2

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Hydraulics and Fluid Mechanics in ME
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

Necessity of air vessel
Lower discharge
Lower speed of operation
High initial and maintenance cost

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Hydraulics and Fluid Mechanics in ME
The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

Pressure head
Velocity head
Pressure head - velocity head
Pressure head + velocity head

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Hydraulics and Fluid Mechanics in ME
The atmospheric pressure at sea level is

760 mm of mercury
103 kN/m2
All of these
10.3 m of water

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Hydraulics and Fluid Mechanics in ME
When the Mach number is less than unity, the flow is called

Sub-sonic flow
Sonic flow
Hyper-sonic flow
Super-sonic flow

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Hydraulics and Fluid Mechanics in ME
The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

L.A.N
(2 L.A.N)/60
(L.A.N)/60
2 L.A.N

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