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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For manometer, a better liquid combination is one having

high density and viscosity
lower surface tension
higher surface tension
surface tension is no criterion

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Hydraulics and Fluid Mechanics in ME
The bulk modulus of elasticity

is independent of pressure and viscosity
is large when fluid is more compressible
increases with pressure
has the dimensions of 1/pressure

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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
v²/2g
0.375v²/2g
0.75v²/2g

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Hydraulics and Fluid Mechanics in ME
Cavitation is caused by

weak material
high pressure
high velocity
low pressure

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

μπ²NR/60t
μπ²NR³/60t
μπ²NR⁴/60t
μπ²NR²/60t

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Hydraulics and Fluid Mechanics in ME
Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called

adhesion
viscosity
compressibility
cohesion

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