Partech - Quiz 3

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Question 1 2 out of 2 points

The collection efficiency of a cyclone separator Selected Answer:

decreases with particle size Answers:

decreases with particle size decreases with particle density increases as the gas temperature is increased decreases with RPM

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Question 2 2 out of 2 points

The following are Assumptions for the computations of parameters of a Centrifugal Bowl, EXCEPT Selected Answer:

None of these

Answers: None of these

is needed for a certain particle size to reach the wall of the bowl and be separated from the liquid sufficient time (residence time)

liquid moves upward with a constant velocity carrying particles with it

particles move radially at its terminal velocity

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Question 3 2 out of 2 points

Gravity separation using clarifiers or thickeners are generally based primarily on Selected Answer:

Hindered settling Answers:

Transition settling Hindered settling Free settling

differential settling

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Question 4 0 out of 2 points

The rate limiting layer in continuous sedimentation is the layer that Selected Answer:

can be determined by the Talmadge and Fitch Method Answers:

largest flux allows all layers to pass through without displacing solids can be determined by the Talmadge and Fitch Method has the smallest area

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Question 5 2 out of 2 points

Tubular centrifuges are used Selected Answer:

D. All of these Answers:

A. for separation of immiscible liquids B. at high rpms C. use to remove traces of solids from oil D. All of these E. B & C

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Question 6 2 out of 2 points

Sink and Float method is applicable for Selected Answer:

Classifiers

Centrifugal basket

Answers:

Tube Centrifuge Clarifiers Classifiers

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Question 7

2 out of 2 points

A type of sedimentation used to INCREASE the concentration of suspended solids in a feed stream is called Selected Answer:

thickener clarifier

Answers:

thickener decantation flocculation

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Question 8 2 out of 2 points

A type of sedimentation used to DECREASE the concentration of suspended solids in a feed stream is called Selected Answer:

clarifier thickener

Answers:

clarifier decantation flocculation

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Question 9 2 out of 2 points

The preferred separation method for particles in the micron size range is Selected Answer:

Centrifugal bowl Centrifugal basket

Answers:

Continuous sedimentation Centrifugal bowl Batch sedimentation

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Question 10 2 out of 2 points

This theory of sedimentation assumes that solids settle by layer at different velocities and displaces an equal volume of fluid and that across each layer, the

concentration is constant. Selected Answer:

Kynch Method Answers:

Abercrombie and Fitch Method Kynch & Fitch Method

Talmadge and Fitch Method Kynch Method

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Question 11 0 out of 2 points

A particle attains its maximum velocity (or terminal velocity) when Selected Answer:

D. A & B Answers:

A. it is not accelerating B. du/dt =0 (or du over dt equals 0) C. it is moving at constant velocity D. A & B

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Question 12 2 out of 2 points

The minimum thickener area for continuous sedimentation tank is the area corresponding to Selected Answer:

the largest flux the initial flux

Answers:

the largest flux the smallest flux the final flux of the particles settling

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Question 13 0 out of 2 points

In a centrifugal bowl, what will produce a clearer overflow? Selected Answer:

Increase the RPM

Answers:

decrease the height of the bowl decrease the diameter of the bowl Increase the RPM All of the above

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Question 14 0 out of 2 points

In which settling layer in batch and continuous sedimentation is the rate of settling a maximum? Selected Answer:

Transition zone Transition zone

Answers:

Suspension zone Clear zone Compression zone

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Question 15 0 out of 2 points

A centrifugal basket follows the principle of Selected Answer:

Stokes Equation Kynch Law

Answers:

Newton’s Law Stokes Equation Ruth Equation

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Question 16 2 out of 2 points

For centrifugal Filters, the thickness of the filter cake is Selected Answer:

r2 - ri Answers:

r2 - ri

r1 - ri r2 - r1 r1 - r2

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Question 17 0 out of 2 points

The drag coefficient (CD) of disk particles (NRe = 10) is Selected Answer:

4 4

Answers:

4.6 3.6 None of these

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Question 18 2 out of 2 points

Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called Selected Answer:

sedimentation Answers:

clarification sedimentation decantation classification

Friday, December 2, 2016 7:10:46 AM PHT OK