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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

L
L/3
L/4
L/2

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Hydraulics and Fluid Mechanics in ME
If the depth of water in an open channel is less than the critical depth, the flow is called

Torrential flow
Tranquil flow
Turbulent flow
Critical flow

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

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

increases
unpredictable
decreases
remains unaffected

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Hydraulics and Fluid Mechanics in ME
The upper surface of a weir over which water flows is known is

sill
crest
nappe
weir top

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Hydraulics and Fluid Mechanics in ME
A flow whose streamline is represented by a curve, is called

Two-dimensional flow
Three-dimensional flow
One-dimensional flow
Four-dimensional flow

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