FLUID MECHANICS QUIZ

What causes cavitation in centrifugal pump?

Low barometric pressure

High suction pressure

High suction velocity

Low suction pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following pipe bends will incur the largest head loss ?

30° bend

45° bend

90° bend

U-bend

TRUE ANSWER : ?
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What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate?

0.5

1

1.5

2

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Ratio of inertial forces to surface tension forces is called the __________ number.

Euler

Weber

Mach

Froude

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

∂/∂t = constant

∂/∂s = constant

∂/∂t = 0

∂/∂s = 0

TRUE ANSWER : ?
YOUR ANSWER : ?

Rubber latex is an example of a __________ .fluid.

Newtonion

Bingham plastic

Pseudoplastic

Dilatent

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Unit of mass velocity is

Kg/m². hr

Kg/m²

Kg/hr

Kg/m³. hr

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Specific speed of a centrifugal pump relates it with another pump having the

Same speed

Dynamic similarity

Geometrical similarity

Same efficiency

TRUE ANSWER : ?
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Potential flow is the flow of

Compressible fluids with no shear

Incompressible fluids with no shear

Incompressible fluids with shear

Compressible fluids with shear

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The head loss in turbulent flow in a pipe varies

Inversely as the square of diameter

As (velocity)²

As velocity

Inversely as the velocity

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YOUR ANSWER : ?

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