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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The efficiency of a Pelton wheel working under constant head ________ with the increase in power.

Decreases
Increases
Remain same
None of these

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Hydraulics and Fluid Mechanics in ME
The height of a water column equivalent to a pressure of 0.15 MPa is

35.3 m
25.3 m
45.3 m
15.3 m

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Hydraulics and Fluid Mechanics in ME
Size of a venturimeter is specified by

throat diameter
both pipe diameter as well as throat diameter
angle of diverging section
pipe diameter

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Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

(V­1 - V2) / V1
V1 / (V1 - V2)
V1² / (V1² - V2²)
(V­1² - V2²) / V1²

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Hydraulics and Fluid Mechanics in ME
Two pipe systems can be said to be equivalent, when the following quantites are same

friction loss and flow
flow and length
length and diameter
friction factor and diameter

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Hydraulics and Fluid Mechanics in ME
The property of a fluid which enables it to resist tensile stress is known as

cohesion
surface tension
compressibility
adhesion

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