1. The ratio of void volume and total surface area of particles is defined as _____

a) Resistance

b) Hydraulic radius

c) Repulsion

d) Void age

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_{H}.

2. What does the ε represents?

a) Porosity

b) Density

c) Viscosity

d) Acidity

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3. Calculate ε, if the total area is 45 m^{2} and the void area is 100 m2?

a) 10.5

b) 0.45

c) 2.222

d) 0.89

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4. Calculate the hydraulic radius, if porosity is 0.6 and specific gravity is 1.50?

a) 1

b) 0.6

c) 0.2

d) 1.8

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5. ____ of the liquid is defined as volumetric flow rate of the liquid divided by the total area.

a) Final velocity

b) Total volume

c) Superficial velocity

d) Wetted perimeter

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_{sup}.

6. What does the below equation represent?

a) Resistance

b) Hydraulic radius

c) Repulsion

d) Void age

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7. What does the below represent?

t= f t_{c}

a) Cake formation

b) Drum rotation

c) Initial extraction

d) Extra time

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_{c}is the time for one full rotation of the drum.

8. ____ is defined as the volume of void filled and total volume.

a) Upper velocity

b) Saturation

c) Residual saturation

d) Superficial velocity

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9. ____ is the maximum volume wetted to ratio of total volume.

a) Residual saturation

b) Saturation

c) Residual saturation

d) Superficial velocity

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_{F}) is defined as the ratio of maximum volume wetting fluid eliminated from flow and total volume of voids.

10. Calculate S, if the voids filled are 40 m^{3} and having 50 m^{3} of total volume?

a) 0.8

b) 1.25

c) 40

d) 50