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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

work
mass
energy
length

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

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Hydraulics and Fluid Mechanics in ME
The static head of a centrifugal pump is equal to the _________ of suction head and delivery head.

Product
Sum
None of these
Difference

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Hydraulics and Fluid Mechanics in ME
The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)

w × Q (H + hf)
w × Q × hf
w × Q × H
w × Q (H - hf)

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Hydraulics and Fluid Mechanics in ME
Which type of the pump is different from others in the same group?

Plunger pump
Gear pump
Cam and piston pump
Screw pump

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Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

Inversely as density
Directly as the air or gas density
As square of density
Inversely as square root of density

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