1. What is the speed of a horizontal belt filter?

a) 0.05 m/s

b) 0.1 m/s

c) 0.5 m/s

d) 10 m/s

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2. In liquid-liquid operations, centrifugal force is employed in

a) Settling

b) Filtration

c) Sedimentation

d) Both setting and filtration

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3. The prayon continuous filter, filters a surface of about ________

a) 1 to 20 m^{2}

b) 2 to 40 m^{2}

c) 30 to 40 m^{2}

d) 100 to 150 m^{2}

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^{2}, it consists of a number of horizontal cells held in rotating frame.

4. Prayon filter has _______ percent of effective area.

a) 85

b) 48

c) 47

d) 50

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5. Any rotating machine in which centrifugal force is applied is called as _______

a) Mixer

b) Rotator

c) Centrifuge

d) Gravitate

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6. The following equation represents the _______

F=0.000341 WrN^{2}

a) Magnitude of gravity

b) Magnitude of Centrifuge

c) Force of inertia

d) Force of tangent

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7. What does the following equation represents?

4.11*10^{-9} N^{2} D_{b}^{2} ρ_{m}

a) Diameter of basket

b) Stress force

c) Force of inertia

d) Force of tangent

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_{S}) in a centrifugal bowl is given by the above equation, where D

_{b}is the diameter of the bowl, N is the rotations and p is the density.

8. Calculate F, if weight of assembly is 100 lb. and 5 ft. in radius having 20 rpm speed?

a) 3.41

b) 5.21

c) 6.82

d) 2.323

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^{2}= 0.000341*100*5*20 = 3.41 lb.

9. Calculate Ss, if Diameter is given as 10 inches and has 200 rpm also consider water as medium?

a) 0.005

b) 0.00822

c) 0.00026

d) 0.0058

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^{3}, so 4.11*(10

^{-9})*10*200 = 0.0082 p.s.i. i.e. self-stress Ss.

10. The speed at which frequency of rotation matches the natural frequency is called ____

a) Final speed

b) Optimum speed

c) Critical speed

d) Operating speed