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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Eight times
Four times
Double
Sixteen times

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Hydraulics and Fluid Mechanics in ME
In centrifugal pumps, maximum efficiency is obtained when the blades are

Bent forward
Radial
Bent backward
Straight

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

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Hydraulics and Fluid Mechanics in ME
In the case of steady flow of a fluid, the acceleration of any fluid particle is

zero
zero under limiting conditions
variable
constant

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Hydraulics and Fluid Mechanics in ME
Dynamic viscosity of most of the gases with rise in temperature

decreases
unpredictable
increases
remains unaffected

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Hydraulics and Fluid Mechanics in ME
The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as

Uniform flow
Steady flow
Turbulent flow
One dimensional flow

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