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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The value of bulk modulus of a fluid is required to determine

Reynold's number
Euler's number
Froude's number
Mach number

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Hydraulics and Fluid Mechanics in ME
The cavitation in a hydraulic machine

Causes sudden drop in power output and efficiency
Reduces the discharge of a turbine
All of these
Causes noise and vibration of various parts

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

Elastic force
Pressure force
Viscous force
Gravity force

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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)

flv²/gd
flv²/2gd
3flv²/2gd
4flv²/2gd

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Hydraulics and Fluid Mechanics in ME
When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be

Horizontal
First rise and then fall
Steep
Nearly horizontal

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Hydraulics and Fluid Mechanics in ME
A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

0.78
0.46
0.87
0.64

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