Mineral Dressing In Metallurgy MCQ

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• Which of the following is softest material
  ক

  Diamond

  খ

  Quartz

  গ

  Calcite

  ঘ

  Fluorite
• A typical collector used in sulphide mineral floatation is
  ক

  pine oil

  খ

  potassium ethyl xanthate

  গ

  oleic acid

  ঘ

  polyacrylamide
• Identify the correct statements:<br>P. A reagent could be a collector for one system and a frother for another.<br>Q. Usage of a frother makes the bubble stable.<br>R. Usage of a frother makes the mineral surface hydrophobic<br>S. Some mineral floatation processes will not require any collector.
  ক

  P, Q

  খ

  Q, R

  গ

  P, S

  ঘ

  P, R
• The following is a typical anionic collector used in floatation.
  ক

  Ethyl dixanthogen

  খ

  Tri methyl cetyl ammonium bromide

  গ

  Potassium ethyl xanthate

  ঘ

  Lauryl amine hydrochloride
• A 200 mesh screen made of steel wire having a diameter of 0.053 mm has an aperture size (in μm)
  ক

  21

  খ

  36

  গ

  74

  ঘ

  127
• Apron conveyors are used for the
  ক

  heavy loads &amp; short runs

  খ

  small loads &amp; long runs

  গ

  heavy loads &amp; long runs

  ঘ

  small loads &amp; short runs
• What are the oxide ore of iron
  ক

  Hematite

  খ

  magnetite

  গ

  wustite

  ঘ

  all of these
• In froth floatation, collector refers to a reagent which primarily,
  ক

  promoters bubble break-up and stabilises the foam

  খ

  absorbs on the surface of the minerals and makes it hydrophobic

  গ

  promotes separation of the particles from the froth

  ঘ

  absorbs on the unwanted minerals and makes it sink
• The figure below shows the cumulative size distribution of particles of a crushed mineral. 10 kg of this material is first passed through a sieve of size 400 micron and then through a sieve of size 300 micron. The weight of mineral (in kg ) that is retained on the 300 micron sieve is . . . . . . . .<br><img src="/images/question-image/metallurgical-engineering/mineral-dressing-in-metallurgy/1684343755-M2-B-2-21.PNG" title="Mineral Dressing in Metallurgy mcq question image" alt="Mineral Dressing in Metallurgy mcq question image">
  ক

  1

  খ

  1.8

  গ

  3

  ঘ

  5.6
• Which of the following size reduction equipment's can accept feed size &gt; 25 cms?
  ক

  Tube mill

  খ

  Ball mill

  গ

  Fluid energy mill

  ঘ

  Jaw crusher
• 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?
  ক

  cresylic acid

  খ

  copper sulphate

  গ

  calcium carbonate

  ঘ

  sodium carbonate
• Dry powdery solid materials are transported by a . . . . . . . . Conveyor.
  ক

  belt

  খ

  bucket

  গ

  screw

  ঘ

  none of these
• Match the processes in Group 1 with the physical principales in Group 2.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group 1</strong></td> <td><strong>Group 2</strong></td> </tr> <tr> <td>P. Floatation</td> <td>1. Differential initial accelaration</td> </tr> <tr> <td>Q. Jigging</td> <td>2. Differential lateral movement</td> </tr> <tr> <td>R. Tabling</td> <td>3. Differential in density</td> </tr> <tr> <td>S. Heavy media separation</td> <td>4. Modification of surface tension</td> </tr></table> P-4, Q-1, R-2, S-3

  খ

  P-4, Q-1, R-2, S-2

  গ

  P-2, Q-3, R-4, S-1

  ঘ

  P-1, Q-3, R-4, S-2
• Bond crushing law
  ক

  calls for relatively less energy for the smaller product particles than does the Rittinger's law

  খ

  is less realistic in estimating the power requirements of commercial crushers

  গ

  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

  ঘ

  states that the work required for the crushing is proportional to the new surface created
• 200 mesh screen has 200 openings per
  ক

  Inch

  খ

  inch²

  গ

  Cm

  ঘ

  cm²
• Electrical energy consumed by a jaw crusher is not a function of the
  ক

  average feed size

  খ

  average product size

  গ

  machine capacity

  ঘ

  none of these
• Match the reagents in Group 1 with their properties in Group 2, in the context of froth floatation.<br>
  ক

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

  খ

  P-1, Q-3, R-2, S-4

  গ

  P-4, Q-2, R-3, S-1

  ঘ

  P-3, Q-2, R-4, S-1
• When the weight of the ball inside a ball mill is just balanced by the centrifugal force, the ball
  ক

  abandons its circular path for a parabolic path

  খ

  abandons its parabolic path for a circular path

  গ

  continues to move on a circular path

  ঘ

  continues to move on a parabolic path
• A simple close grinding circuit may consist of a
  ক

  ball mill and a classifier

  খ

  rod mill and a hydrocyclone

  গ

  jaw crusher and a hydrocyclone

  ঘ

  ball mill and a froth floatation cell
• Screw conveyors are
  ক

  run at very high rpm

  খ

  suitable for sticky materials

  গ

  suitable tor highly abrasive materials

  ঘ

  all A, B and C
• The screen effectiveness . . . . . . . . with increase in the capacity of the screen.
  ক

  Decreases

  খ

  increases

  গ

  increases linearly

  ঘ

  remains unaffected
• Fibrous material is broken by a
  ক

  roll crusher

  খ

  squirrel-cage disintegrator

  গ

  ball mill

  ঘ

  none of these
• The process for selectively separating hydrophobic materials from hydrophilic.
  ক

  Froth flotation

  খ

  Gravity separation

  গ

  Magnetic separation

  ঘ

  None of these
• Ore concentration by Jigging is based on the . . . . . . . . of the particles.
  ক

  difference in specific gravities

  খ

  wettability

  গ

  Shape

  ঘ

  none of these
• Cyclones are primarily used for
  ক

  comminution

  খ

  concentration

  গ

  dewatering

  ঘ

  classification
• Electrostatic separation of minerals from each other is based on their differences in the following property:
  ক

  Densities

  খ

  Magnetic permeabilites

  গ

  Electrical conductivities

  ঘ

  Hardness
• Role of a "collector" in floatation is to
  ক

  form a water repelling film on the mineral surface

  খ

  create and stabilise the froth

  গ

  act as a surfactant

  ঘ

  collect the minerals according to their specific gravity
• Floatation beneficiation is based on the principle of
  ক

  Miiieral surface hydrophbicity

  খ

  Gravity difference

  গ

  Chemical reactivity

  ঘ

  Partical size difference
• Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
  ক

  check plates

  খ

  jaw plates

  গ

  toggles

  ঘ

  crush shaft
• Match the unit operation in Group I with its corresponding principal in Group II:<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Group I</strong></td> <td><strong>Group II</strong></td> </tr> <tr> <td>P. Jigging</td> <td>1. Modification of surface tension</td> </tr> <tr> <td>Q. Tabling</td> <td>2. Difference in density</td> </tr> <tr> <td>R. Heavy media separation</td> <td>3. Differential initial acceleration</td> </tr> <tr> <td>S. Flotation</td> <td>4. Differential lateral movement</td> </tr></table> P-3, Q-4, R-2, S-1

  খ

  P-2, Q-3, R-1, S-4

  গ

  P-4, Q-2, R-3, S-1

  ঘ

  P-1, Q-3, R-2, S-4