Mineral Dressing in Metallurgy MCQ Questions and Answers

31

Screw conveyors are

A) run at very high rpm B) suitable for sticky materials C) suitable tor highly abrasive materials D) all A, B and C

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Answer & Solution

Answer: Option B

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32

A simple close grinding circuit may consist of a

A) ball mill and a classifier B) rod mill and a hydrocyclone C) jaw crusher and a hydrocyclone D) ball mill and a froth floatation cell

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Answer & Solution

Answer: Option A

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33

When the weight of the ball inside a ball mill is just balanced by the centrifugal force, the ball

A) abandons its circular path for a parabolic path B) abandons its parabolic path for a circular path C) continues to move on a circular path D) continues to move on a parabolic path

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Answer & Solution

Answer: Option A

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34

Match the reagents in Group 1 with their properties in Group 2, in the context of froth floatation.

Group 1	Group 2
P. Frother	1. Alters the chemical nature of mineral surfaces so that they become hydrophobic due to action of collector
Q. Activator	2. Absorbs on air-water interface and reduces surface tension to stabilise the bubble
R. Regulator	3. Increases the selectivity of floatation by rendering certain mineral hydrophilic
S. Depressant	4. Modifies the action of collector either by intensifying or reducing its water repellant effect

A) P-2, Q-1, R-4, S-3 B) P-1, Q-3, R-2, S-4 C) P-4, Q-2, R-3, S-1 D) P-3, Q-2, R-4, S-1

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Answer & Solution

Answer: Option D

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35

Electrical energy consumed by a jaw crusher is not a function of the

A) average feed size B) average product size C) machine capacity D) none of these

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Answer & Solution

Answer: Option D

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36

200 mesh screen has 200 openings per

A) Inch B) inch² C) Cm D) cm²

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Answer & Solution

Answer: Option A

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37

Bond crushing law

A) calls for relatively less energy for the smaller product particles than does the Rittinger's law B) is less realistic in estimating the power requirements of commercial crushers C) states that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product D) states that the work required for the crushing is proportional to the new surface created

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Answer & Solution

Answer: Option A

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38

Match the processes in Group 1 with the physical principales in Group 2.

Group 1	Group 2
P. Floatation	1. Differential initial accelaration
Q. Jigging	2. Differential lateral movement
R. Tabling	3. Differential in density
S. Heavy media separation	4. Modification of surface tension

A) P-4, Q-1, R-2, S-3 B) P-4, Q-1, R-2, S-2 C) P-2, Q-3, R-4, S-1 D) P-1, Q-3, R-4, S-2

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Answer & Solution

Answer: Option A

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39

Dry powdery solid materials are transported by a . . . . . . . . Conveyor.

A) belt B) bucket C) screw D) none of these

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Answer & Solution

Answer: Option C

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40

Activators are those chemicals which help buoying up one mineral in preference to the other in the troth floatation process. Which of the following is an activator?

A) cresylic acid B) copper sulphate C) calcium carbonate D) sodium carbonate

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Answer & Solution

Answer: Option B

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Mineral Dressing in Metallurgy MCQ Questions and Answers | Metallurgical Engineering