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Fluid Mechanics

Fluid Mechanics
The equivalent diameter for flow through a rectangular duct of width B and height H is

4HB/(H + B)
HB/(H + B)
HB/2(H + B)
2HB/(H + B)

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

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

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Fluid Mechanics
The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop fo __________ fluid.

Pseudoplastic
Bingham plastic
Dilatant
Newtonion

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Fluid Mechanics
Rise of liquid in a capillary tube is due to

Cohesion
Both A & B
Adhesion
Neither A nor B

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Fluid Mechanics
With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss

Decreases
Remains constant
Increases linearly
Increases

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Fluid Mechanics
The head loss in turbulent flow in a pipe varies

As velocity
Inversely as the square of diameter
Inversely as the velocity
As (velocity)²

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