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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Rain drops are spherical because of

surface tension forces
viscosity
atmospheric pressure
air resistance

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Hydraulics and Fluid Mechanics in ME
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

4flv²/2gd
flv²/gd
flv²/2gd
3flv²/2gd

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Hydraulics and Fluid Mechanics in ME
According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2 where m is equal to

0.405 + (0.003/H)
0.003 + (H/0.405)
0.003 + (0.405/H)
0.405 + (H/0.003)

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Hydraulics and Fluid Mechanics in ME
The specific speed of a hydraulic turbine depends upon

Speed and head of water
Speed, power developed and head of water
Discharge and power developed
Speed and power developed

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Hydraulics and Fluid Mechanics in ME
Which of the following has highest coefficient of discharge ?

CipoUetti weir
Borda’s mouthpiece running full
venturimeter
sharp edged orifice

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Hydraulics and Fluid Mechanics in ME
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is

ηh = ηo × ηm
None of these
ηo = ηh × ηm
ηm = ηm × ηh

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