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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
All the terms of energy in Bernoulli’s equation have dimension of

mass
work
length
energy

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Hydraulics and Fluid Mechanics in ME
A nozzle is generally made of

Convergent shape
Convergent-divergent shape
Cylindrical shape
Divergent shape

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Hydraulics and Fluid Mechanics in ME
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

dependent only on Reynolds number
dependent on relative roughness only
a function of Reynolds number and relative roughness
constant

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

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Hydraulics and Fluid Mechanics in ME
The centre of gravity of the volume of the liquid displaced is called

None of the listed here
Centre of buoyancy
Metacentre
Centre of pressure

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Hydraulics and Fluid Mechanics in ME
A pitot tube is used to measure the

Velocity of flow at the required point in a pipe
Pressure difference between two points in a pipe
Discharge through a pipe
Total pressure of liquid flowing in a pipe

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