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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)

0.5v²/2g
0.75v²/2g
0.375v²/2g
v²/2g

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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

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

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Hydraulics and Fluid Mechanics in ME
The dynamic viscosity of gases __________ with rise in temperature.

Increases
Decreases
Remain unaffected
None of these

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

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Hydraulics and Fluid Mechanics in ME
In steady flow of a fluid, the total accele ration of any fluid particle

is independent of coordinates
can be zero
is always zero
is never zero

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Hydraulics and Fluid Mechanics in ME
To avoid an interruption in the flow of a siphon, an air vessel is provided

At the summit
At any point between inlet and outlet
At the outlet
At the inlet

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