Fluid Mechanics
Steady flow occurs, when the

Conditions change steadily with time
Rate of the velocity change is constant
Conditions are the same at the adjacent points at any instant
Conditions do not change with time at any point

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Fluid Mechanics
Vane anemometer

Is an area meter
Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed
None of these
Is a variable head meter

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