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Fluid Mechanics

Fluid Mechanics
The ratio of actual discharge to theoretical discharge through an orifice is equal to

Cc . Cv
Cc . Cd
Cv . Cd
Cd/Cv

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Fluid Mechanics
Foot valves are provided in the suction line of a centrifugal pump to

Remove the contaminant present in the liquid
Control the liquid discharge
Minimise the fluctuation in discharge
Avoid priming, every time we start the pump

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Fluid Mechanics
The terminal velocity of a small sphere settling in a viscous fluid varies as the

First power of its dimeter
Inverse of the fluid viscosity
Inverse square of the diameter
Square of the difference in specific weights of solid & fluid

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Fluid Mechanics
Scale up of agitator design requires

All of these
Both geometrical and dynamic similarity
Dynamic similarity only
Geometrical similarity only

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Fluid Mechanics
Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.

∂/∂s = 0
∂/∂t = 0
∂/∂s = constant
∂/∂t = constant

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Fluid Mechanics
The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec.

736.4
1.8
12.4
186.2

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