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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, turbulent flow occurs when Reynolds number is

less than 4000
more than 4000
between 2000 and 4000
less than 2000

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Hydraulics and Fluid Mechanics in ME
The unit of kinematic viscosity in S. I. units is

N-s/m2
N-m
N-m/s
m2/s

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Hydraulics and Fluid Mechanics in ME
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)

4σ cosα/wd
4wd/σ cosα
wd/4σ cosα
σ cosα/4wd

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

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

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Hydraulics and Fluid Mechanics in ME
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency.

None of these
Hydraulic
Overall
Mechanical

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Hydraulics and Fluid Mechanics in ME
Alcohol is used in manometers because

It is clearly visible
It has low vapour pressure
It has low surface tension
It can provide longer column due to low density

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