EM3 Mixed Reviewer- 2
c
46. Brass is an alloy of copper a. Lead b. Iron c. Zinc d. Tin
d
54. This heat treatment cools the metal or alloy in still air after being heated at some predetermined conditions. a. Annealing b. Hardening c. Tempering d. Normalizing
a
55. Heat treatment process where the metal or alloy is cooled very fast after being heated. a. Hardening b. Tempering c. Annealing d. Normalizing
b
62. The stationary crushing surface of a gyratory crusher is in the form of a. Cylinder c. Frustrum of a cone b. Inverted frustrum of a cone d. Paraboloid
c
63. The gyrating crushing surface of a gyratory or cone crusher. a. Concave liner b. Bowl liner c. Mantle liner d. Spinner liner
d
64. The stationary crushing surface of a gyratory crusher. a. Spider b. Mantle Liner c. Bowl Liner d. Concave Liner
b
65. The stationary crushing surface of a cone crusher. a. Mantle liner b. Bowl liner c. Spider d. Concave liner
c
66. The largest diameter of a particle that could be taken in by a 30 - 70 gyratory crusher a. 70 inches b. 35 inches c. 30 inches d. 15 inches
a
67. Type of crusher commonly used for secondary and tertiary crushing. a. Cone crusher b. Jaw Crusher c. Impact Crusher d. Gyratory Crusher
d
68. It states that the work input in crushing or grinding is proportional to the new surface area produced on the particles. a. Fick's Law b. Bond's Law c. Kick's Law d. Rittenger's Law
b
69. It states that the work input in crushing or grinding is proportional to the reduction in diameter of the particles. a. Bonds Law b. Kick's Law c. Rittenger's Law d. Fick's Law
d
7. These are materials where all volatiles have been removed by heating. a. Sinter b. Blister c. Dross d. Calcine
c
74. A grinding mill which utilizes solely large particles of the ore to effect grinding of the finer ones during which the large particles themselves are ground. a. Hammer mill b. Semi Autogenous mill c. Autogenous mill d. Verti mill
b
75. A grinding mill which utilizes some steel balls plus the large particles of the ore to effect grinding of the finer ones. a. Verti mill b. Semi Autogenous mill c. Hammer mill d. Autogenous mill
c
76. In hydrocyclone, size separation is effected primarily by the difference in acting on the coarse and fine particles as the slurry passes inside the cyclone. a. Frictional force b. Gravitational force c. Centrifugal force d. Tangential force
c
1. It involves metallurgical processes intended to recover the desired metal either from the ore or from the concentrate. a. Physical metallurgy b. Pyrometallurgy c. Extractive metallurgy d. Ferrous metallurgy
b
10. Fluxes are added to the material being smelted to form . a. Matte b. Slag c. Speiss d. Dross
b
100. It is a common reducing agent in fire assaying. a. Niter b. Flour c. Bone - Ash d. Salt
c
11. One effect of flux on the slag formed is to a. Oxidize the desired metal c. Decrease the melting point b. Increase the melting point d. Increase viscosity
a
12. In sintering, fines are agglomerated into lumps by heating until . of the surfaces occurs. a. Partial fusion b. Partial Oxidation c. Complete Oxidation d. Complete fusion
b
13. It is the product of an iron blast furnace. a. Wrought iron b. Pig iron c. Malleable iron d. Cast iron
d
14. It is one of the main impurities in pig iron. a. Chromium b. Nickel c. Calcium d. Carbon
c
15. It is the fuel in an iron blast furnace. a. Coal b. Limestone c. Coke d. Bunker Oil
d
16. Coke is produced from coal by . a. Flotation b. Comminution c. Solvent Extraction d. Destructive Distillation
a
17. It occurs during the air blast in an iron blast furnace. a. Partial combustion of coke c. Partial oxidation of iron b. Complete combustion of coke d. Partial oxidation of impurities
b
18. The process wherein air is blown through molten pig iron or matte where by sulfur and other impurities are removed from the melt. a. Smelting b. Converting c. Blowing d. Roasting
d
19. It occurs during the blowing stage in a converting process. a. solidification of metal c. Solidification of impurities b. Reduction of metal d. Oxidation of impurities
b
2. It includes extraction processes of metal values from the ore or concentrate which are undertaken at high temperatures. a. Ore dressing b. Pyrometallurgy c. Smelting d. Converting
c
20. White metal is an impure produced in an intermediate stage of converting process. a. FeS2 b. PbS c. Cu2S d. ZnS
c
21. It is impure copper produced in copper converting process. a. Sinter b. Clinker c. Blister d. Spelter
a
22. It is a pig iron converting process. a. Bessemer process b. Merryl Crowe Process c. Furan Process d. Durville process
b
23. PASAR uses smelting process in smelting copper concentrates. a. Open Hearth b. Flash c. Kaldo d. Bessemer
d
24. The end product of PASAR smelting process that goes to the refinery. a. Blister copper b. Cathode Copper c. Black Copper d. Anode Copper
d
25. It is a major gaseous product of sulfide roasting. a. CO b. SiO2 c. CO2 d. SO2
a
26. It is a product of sintering process. a. Tungsten Carbide Cutting Tips c. Bronze rivets b. Aluminum rivets d. Tool steel cutting tips
c
27. A solution containing substantial amount of desired metal values. a. Barren Solution b. Solid Solution c. Pregnant Solution d. Aqua Regia
b
28. Metallic gold and silver could be effectively dissolved in . a. NaCl Solution b. NaCn Solution c.NaHCO3 Solution d. NaCNS Solution
a
29. Hydrometallurgical processes where solutions such as acids, bases or aqueous salts are used to dissolve the desired metal or mineral for eventual recovery. a. Leaching b. Electrowinning c.Precipitation d. Solvent Extraction
d
3. Acid leaching of copper and gold cyanidation are examples of this group of metallurgical operations. a. Pyrometallurgy b. Electrowinning c. Mineral dressing d. Hydrometallurgy
b
30. In CIP, activated carbon is in contact with the cyanide solution , the leaching process. a. Before b. After c. During d. Intermediate
c
31. In CIP, the material that effectively remove the cyanides of precious metals from the leach solution. a. Coal b. Charcoal c. Activated Carbon d. Coke
c
32. In CIL, activated carbon is in contact with the cyanide solution the leaching process. a. Before b. After c. During d. Indeterminate
a
33. Precious metal values can be recovered from loaded carbon by a. Smelting b. Converting c. Roasting d. Precipitation
d
34. Precious metal values in clarified cyanide solution can be recovered by adding to the solution. a. Lead Dust b. Copper dust c. Iron dust d. Zinc dust
b
35. In gold cyanidation, alkalinity is maintained above PH 10 to prevent of cyanide ion thus decreasing the cyanide concentration. a. Electrolysis b. Hydrolysis c. Pyrolysis d. Metamorphosis
c
36. Hydrocyanic acid (HCN) gas that will be evolved from the cyanide solution if the proper alkalinity is not maintained during cyanidation is . a. Inert to health b. Good to health c. Poisonous d. Indeterminate
b
37. Common method of achieving solid-liquid separation where the general solids flow is opposite in direction to the general liquid flow. a. CCP b. CCD c. CCC d. CIT
a
38. Method of extracting specific metal or mineral values from aqueous pregnant solution using natural or synthetic resins. a. Ion Exchange b. Solvent extraction c. Carbon adsorption d. None of the above
b
39. The formation of sponge/cement copper from acidic pregnant copper solution upon contact with scrap iron is example of . a. Solvent extraction b. Precipitation c. Ion Exchange d. Electrowinning
b
4. Reduction of iron oxides into metallic iron using carbon monoxide from partial combustion of carbon is an example of . a. Converting b. smelting c. Fire assaying d. Refining
d
40. In PASAR operations the product of electrolytic refining a. Blister Copper b. Anode Copper c. Black Copper d. Cathode copper
d
41. A crystal structure with an atom at the center of the cubic cell. a. FCC b. HCP c. BCT d. BCC
a
42. A crystal structure where half of an atom is located at the center of each face of the cubic cell. a. FCC b. BCT c. BCC d. HCP
c
43. It is the crystal structure of ferrite iron a. FCC b. HCP c. BCC d. BCT
d
44. It is the crystal structure of Austenite iron. a. HCP b. BCC c. BCT d. FCC
b
45. A metal containing minute amount of other elements. a. Solid solution b. Alloy c. Black metal d. None of the above
a
47. Bronze is an alloy of copper and ___. a. Tin b. Lead c. Zinc d. Iron
b
48. The metal that is in liquid state at room temperature. a. Antimony b. Mercury c. Selenium d. Radon
c
49. The property of metals which non-metals do not have. a. Porosity b. Hardness c. Malleability d. Durability
b
5. A liquid formed at high temperature which consists of a mixture of metal oxide silicates a. melt b. slags c. Matte d. Calcine
d
50. Ductility is the capacity of a material to undergo deformation without rupture under heavy load. a. Bending b. Shearing c. Compressive d. Gold
a
51. The capacity of a material to withstand bending or shearing load without fracture. a. Toughness b. Hardness c. Malleability d. Ductility
b
52. Malleability is the capacity of a material to withstand deformation without rupture under load. a. Bending b. Compressive c. Tensile d. Shearing
c
53. In annealing, the metal or alloy is heated to a pre-determined temperature and time and allowed to cool . a. In air b. In quenching bath c. very slowly d. moderately fast
c
56. The hardest crystal form of iron a. Austenite b. Ferrite c. Martensite d. Cementite
b
57. It is an economic justification of ore dressing. a. Savings in Mining cost b. Savings in freight c. Savings in milling cost d. Savings in manpower
d
58. It is the size to which an ore must be reduced so that almost all of the valuable mineral is freed from attachment with the gangue materials. a. Screen size b. Separation size c. Grind size d. Liberation size
b
59. Sequence of ore particle size reduction from the run-of-mine size to the economic liberation size of the desired mineral. a. Classification b. Comminution c. Beneficiation d. Gravity separation
d
6. In smelting, slags acts as the of the impurities present in metal being smelted. a. Source b. Reducer c. Precipitant d. Collector
c
60. This type of crusher consists of two essentially planar crushing surfaces one swinging to and from the other stationary surface. a. Roll crusher b. Gyratory crusher c. Jaw crusher d. Impact crusher
a
61. Type of jaw crusher where the upper end of the movable crushing surface is the fulcrum end while the lower end swings to and from the stationary surface. a. Blake type b. Single toggle type c. Double Toggle type d. Dodge type
c
70. It states that the work in crushing or grinding is inversely proportional to the square root of the new surface produced on the particles. a. Kick's Law b. Rittenger's Law c. Bond's Law d. Fick's Law
b
71. The energy in kw-hr necessary to reduce one short ton of ore material from theoritically infinite size to 80% passing 100 mesh. a. Abrasion Index b. Work Index c. Grindability d. Breakage Index
d
72. The ratio of feed size to the product size. a. Concentration ratio b. Circulating Load Ratio c. Stripping Ratio d. Reduction Ratio
a
73. At critical speed of mill, there is of the grinding media resulting to loss of grinding action. a. Centrifuging b. Cascading c. Cataracting d. Discharging
b
77. In spiral or rake classifier, size separation is attained mainly due to the difference in between the coarse and fine particles. a. Angular Velocity b. Settling Velocity c. Horizontal Acceleration d. Angular Acceleration
d
78. Surface characteristics of mineral particles properly coated with flotation collector. a. the same as uncoated b. Hydrophillic c. Aerophobic d. Hydrophobic
a
79. The frother added to flotation pump the mineralized bubbles rising to the surface of the pulp. a. Stabilizes b. Expands c. Contracts d. Destabilizes
a
8. Matte is a high temperature homogenous liquid solution of a mixture of . a. Metal sulfides b. Metal oxides c. Arsenides d. Antimonides
c
80. Xanthates with long hydrocarbon chains are collectors compared with those having shorter chains. a. Weaker b. of equal strength as c. stronger d. Selective
b
81. Sulfide flotation is normally undertaken at PH. a. Neutral b. Basic c. Acidic d. Acidic to Basic
a
82. Flotation process where all valuable minerals are floated from gangue for subsequent separation of each of the valuable minerals. a. Bulk Flotation b. Skin Flotation c. Differential Flotation d. Oil Flotation
c
83. Flotation process undertaken to separate a group of minerals from each other after the group have been floated from the gangue. a. Skin Flotation b. Bulk Flotation c. Differential Flotation d. Oil Flotation
d
84. Flotation reagent which prevents the collectors from coating the mineral surface. a. Activator b. Modifier c. Conditioner d. Depressant
b
85. Flotation reagent which enhances the collector coating on the mineral surface. a. Depressant b. Activator c. Modifier d. Secondary Collector
a
86. Strong collectors generally has selectivity compared with weaker ones. a. Lower b. the same c. Higher d. Indeterminate
c
87. Weak collectors generally has selectivity compared with weaker ones. a. the same b. Lower c. Higher d. Indeterminate
d
88. The angle between the surface of a mineral and the wall of an air bubble on the surface. a. Collection angle b. Attachment angle c. Bubble angle d. Contact angle
a
89. Collector - coated mineral surface has contact angle compared with uncoated one. a. High b. the same c. low d. indeterminate
c
9. Spelter is impure produced by smelting process. a. Iron b. Copper c. Zinc d. Tin
b
90. Uncoated mineral surface has contact angle compared with collector coated one. a. the same b. low c. high d. indeterminate
c
91. One of the following is not a flotation collector. a. Sodium dithiophosphate c. Sodium phosphate b. Sodium isopropyl xanthate d. Thiocarbanilide
b
92. One of the following is not a frother. a. Pine oil b.Methyl alcohol c. Amyl alcohol d. Cresylic acid
d
93. When two minerals of different specific gravities are placed into a liquid with specific gravity intermediate between the two, of the two minerals could be made. a. Agglomeration b. Flocculation c. Flotation d. Separation
b
94. In a suspension of fine heavy particles such as magnetite, ferrosilicon, or galena in water, the apparent specific gravity of water is . a. lowered b. increased c. not changed d. indeterminate
b
95. A step in fire assaying where the sample, thoroughly mixed with the necessary reagents and fluxes, is heated until all the gangue materials are slagged and all the precious metals are dissolved in molten lead that is formed. a. Scorification b. Fusion c. Parting d. Cupellation
a
96. A step in fire assaying where the dore after having been weighed flattened is treated with nitric acid. a. Parting c. Digesting b. Flattening d. Acidifying
c
97. A step in fire assaying where the lead button is carefully oxidized to rrecover the precious metals it had dissolved. a. Oxidation b. Fusion c. Cupellation d. Parting
d
98. It is the source of metallic lead in fire assaying. a. Niter b. Borax c. Argol d. Litharge
c
99. It is a powerful oxidizing agent in fire assaying. a. Litharge b. Argol c. Niter d. Flour
