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Hydraulics and Fluid Mechanics in ME

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

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

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Hydraulics and Fluid Mechanics in ME
In a venturi-flume, the flow takes place at

None of these
Atmospheric pressure
Gauge pressure
Absolute pressure

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Hydraulics and Fluid Mechanics in ME
A large Reynold number is indication of

Highly turbulent flow
Laminar flow
Smooth and streamline flow
Steady flow

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Hydraulics and Fluid Mechanics in ME
Reynold's number is the ratio of the inertia force to the

Viscous force
Gravity force
Elastic force
Surface tension force

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Hydraulics and Fluid Mechanics in ME
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)

d = (D⁵/8fl)1/5
d = (D⁵/8fl)1/3
d = (D⁵/8fl)1/2
d = (D⁵/8fl)1/4

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Hydraulics and Fluid Mechanics in ME
The loss of pressure head in case of laminar flow is proportional to

(Velocity)3
(Velocity)4
(Velocity)2
Velocity

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