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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is

0.5
1
None of these
0.25

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Hydraulics and Fluid Mechanics in ME
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is

1.5 m3/s
0.5 m3/s
0.25 m3/s
2.5 m3/s

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Hydraulics and Fluid Mechanics in ME
Multistage centrifugal pumps are used to

All of these
Produce high heads
Pump viscous fluids
Give high discharge

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Hydraulics and Fluid Mechanics in ME
Delivery head of a centrifugal pump is

Inversely proportional to N²
Inversely proportional to N
Directly proportional to N
Directly proportional to N²

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Hydraulics and Fluid Mechanics in ME
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)

wH/2
wH2/2
wH2/3
wH

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Hydraulics and Fluid Mechanics in ME
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge

0.75 Q
1.5 Q
Same quantity of liquid
Q/0.75

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