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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The number of buckets on the periphery of a Pelton wheel is given by

(D/2d) + 20
(D/2d) + 15
(D/2d) + 10
(D/2d) + 5

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

(μπ²N/60t) × (R₁² - R₂²)
μπ²N/60t) × (R₁³ - R₂³)
(μπ²N/60t) × (R₁⁴ - R₂⁴)
(μπ²N/60t) × (R₁ - R₂)

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Hydraulics and Fluid Mechanics in ME
Stream lines and path lines always coincide in case of

laminar flow
uniform flow
steady flow
turbulent flow

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Hydraulics and Fluid Mechanics in ME
For a body floating in a liquid the normal pressure exerted by the liquid acts at

e.g. of the body
metacentre
all points on the surface of the body
bottom surface of the body

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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 correct relationship among displacement thickness d, momentum thickness m and energy thickness e is

e > d > m
d > e > m
d > m > e
e > m > d

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