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Hydraulics and Fluid Mechanics in ME

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

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Hydraulics and Fluid Mechanics in ME
An ideal flow of any fluid must satisfy

continuity equation
Pascal law
Newton’s law of viscosity
boundary layer theory

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Hydraulics and Fluid Mechanics in ME
The mercury does not wet the glass. This is due to the property of the liquid known as

Viscosity
Cohesion
Surface tension
Adhesion

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Hydraulics and Fluid Mechanics in ME
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is

82.4 r.p.m.
24.8 r.p.m.
248 r.p.m
48.2 r.p.m

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Hydraulics and Fluid Mechanics in ME
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

Develops unit power under unit head
Delivers unit discharge under unit speed
Delivers unit discharge under unit head
Develops unit power under unit speed

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Hydraulics and Fluid Mechanics in ME
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

Cc/Cr
Cc × Cv
Cc × Cr
Cv × Cr

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