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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The liquid used in manometers should have

Low surface tension
High density
Low density
High surface tension

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Hydraulics and Fluid Mechanics in ME
Casting of a centrifugal pump is designed so as to minimize

Friction loss
Loss of kinetic energy
Static head
Cavitations

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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)

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

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Hydraulics and Fluid Mechanics in ME
Capillary action is due to the

All of the listed here
Cohesion of the liquid
Adhesion of the liquid molecules and the molecules on the surface of a solid
Surface tension

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Hydraulics and Fluid Mechanics in ME
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe)

0.223 R
0.707 R
0.423 R
0.577 R

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Hydraulics and Fluid Mechanics in ME
Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is

less than d
between d and 1.5 d
greater than 2d
between 1.5 d and 2d

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