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Metallurgy > Quiz 1 > Flashcards

Quiz 1 Flashcards

1
Q
  1. Fire assay is considered as
    a. volumetric method
    b. gravimetric
    c. gasometric
    d. wet method
A

b

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2
Q

Gold is soluble in
a. HCl c. Hydrofluoric acid
b. H2SO4 d. Aqua Regia

A

d

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3
Q

Flour is used in assaying as
a. flux c. reducing agent
b. oxidizing agent d. combines with Pb

A

c

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3
Q

This formula of iron oxide and silica FeOSiO2 is
a. monosilicate c. subsilicate
b. bisilicate d. sesquisilicate

A

b

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3
Q

The step in assaying that forms the dore is
a. cupellation c. parting
b. inquartation d. annealing

A

a

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4
Q

Soda ash is a powerful
a. acid flux c. basic flux
b. neutral agent d. combines with SiO2

A

c

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5
Q

In fission, process in assaying the reagent that enhance fluidity is
a. soda ash c. SiO2
b. litharge d. borax

A

a

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5
Q

The artificial sulfide formed in the dry way in assaying is
a. speiss c. slag
b. matte d. button

A

b

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6
Q

The assay of gold bullion is expressed as
a. ppm c. fineness
b. gm/MT d. percent

A

c

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6
Q

An alloy sufficient in precious metals bearing in economic significance is
a. bullion c. amalgam
b. dore d. button

A

a

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7
Q

The chiddy method is applicable in analyzing
a. cyanide c. Au in cyanide solution
b. protective alkalinity d. cyanicides

A

c

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8
Q

Slag factor is
a. ratio of the weight of the mineral to SiO2
b. quantified weight of slag to be produced
c. ratio of the oxygen in the acid component
d. borax to silicon ratio in the charge

A

c

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9
Q

The method of assaying carried out in a shallow clay dish by oxidizing fusion is called
a. wet analysis c. qualitative analysis
b. scorification d. solid solvent extraction

A

b

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10
Q

The element that causes frequent trouble in Ag assay is
a. Bi c. Cu
b. Sb d. Zn

A

a

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11
Q

An in-quart is added to
a. control the size of the button
b. establish the ideal silver to gold ratio to enhance parting
c. makes the reduced Pb malleable
d. makes the dore ductile

A

b

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12
Q

Slag in the process fusion becomes very viscous due to
a. insufficient finishing c. lacks acid fluxes
b. insufficient fusion time d. excess of SiO2

A

b

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13
Q

One purpose of charge calculation is to
a. control sizes of button c. produce a glassy slag
b. reduce the PbO d. increase life of crucible

A

a

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14
Q

In assaying loaded carbon, the oxidizing agent used is
a. Niter c. MnO
b. Fe3O4 d. CaCO3qa

A

a

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15
Q

The reducing power of pyrite when soda ash is added is
a. increased c. lowered
b. remained constant d. reduced to neutral

A

a

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16
Q

An assay ton is
a. 20 gm c. 26.93 gm
b. 29.199 gm d. 30 gm

A

b

17
Q

Silica is
a. basic flux c. neutral flux
b. acid flux d. borax to control size of button

A

b

18
Q

For sulfide ores, we use
a. niter c. pyrite
b. flour d. borax to control size of button

A

a

19
Q

Mercury vaporizes
a. 3690 C c. 3500 C
b. 10000 C d. 4500 C

A

a

19
Q

The step where the Pb is oxidized is called
a. cupellation c. parting
b. inquartation d. annealing

A

a

20
Q

The alloy of gold and silver produces after cupellation is
a. amalgam c. magnetic gold
b. dore d. cornet

A

b

21
Q

The reducing power of flour is
a. 10 c. 15
b. 12 d. 20

A

a

22
Q

To prepare a cupel, the principal component is
a. bone ash c. clay
b. cement d. alumina

A

a

23
Q

The ideal size of Pb button is
a. 25 gm c. 35 gm
b. 30 gm d. 40 gm

A

a

24
Q

The oxidizing power of niter is
a. 4 c. 7
b. 5 d. 8

A

a

25
Q

12 karat gold is
a. 50% Au c. 70% Au
b. 60% Au d. 90% Au

A

a

26
Q

The reducing power of niter or salt peter is?
A. 4.1 C. 4.4
B. 4.3 D. 4.2

A

d

27
Q

What is the maximum temperature for the fusion stage?
A. 1400 degrees C. 1200 degrees
B. 1000 degrees D. 1600 degrees

A

c

27
Q

What does salt do in fire assaying?
A. desulfurizing flux C. cover and wash
B. collecting agent D. makes it salty

A

c

28
Q

Which of the following are undesirables in fire assaying?
A. slag and speiss
B. magnesia cupels and matte
C. matte and speiss
D. silver nitrate and sulfur gas

A

c

28
Q

One AT or assay ton is equivalent to?
A. 28.166 g C. 26.177 g
B. 27.177 g D. 29.199 g

A

d

29
Q

Which among the following is not a classification of slag material?
A. pentasilicate slag C. Bisilicate slag
B. monosilicate slag D. subsilicate slag

A

a

30
Q

In the general sampling procedure, the first lot should be what size wrt the whole lot?
A. 25% C. 20%
B. 30% D. 35%

A

c

30
Q

It is the fusion stage wherein the reaction involves the evolution of gases.
A. 1st stage C. 3rd stage
B. 4th stage D. 2nd stage

A

d

30
Q

In fire assaying, it is the temperature wherein litharge melts?
A. 993 degrees C. 883 degrees
B. 773 degrees D. 327 degrees

A

c

30
Q

The dilute acid used in fire assaying is?
A. dilute hydrochloric acid
B. dilute sulfuric acid
C. dilute acetic acid
D. dilute nitric acid

A

d

30
Q

The cupel is made up of what material?
A. sheep bone ash C. PETN
B. tensile ceramics D. calcareous resin

A

a

31
Q

Borax melts at what temperature?
A. 560 degrees C. 580 degrees
B. 570 degrees D. 600 degrees

A

a

32
Q

In fire assaying the oxidation of Pb to PbO is?
A. exothermic C. adiabatic
B. endothermic D. isothermal

A

a

32
Q

It is an artificial metallic arsenide o antimonide formed during smelting operation. In fire assaying, it is in the form as an arsenide of iron
A. slag C. speiss
B. matte D. lead button

A

c

32
Q

Which of the following are examples of neutral flux?
A. none of the choices C. B and D
B. fluorspar D. cryolite

A

c

33
Q

This is an active readily fusible acid flux. It is often used as a cover for crucible fusion
A. silica C. nitrate
B. litharge D. borax

A

d

34
Q

The readily fusible acid flux. It is a deoxidizing desulfurizing agent and when reduce, applies the metal necessary for the collection of gold and silver
A. Na2 CO3 C. PbO
B. CaCO3 D. K2CO3

A

c

35
Q

Powerful oxidizing agent. It is in fire assay to oxidize sulphides arsenide, etc. When present in large amount it causes boiling of the crucible charge and necessitates careful heating to prevent loss. What is the oxidizing agent?
A. niter C. K2 CO3
B. Ag NO3 D. PbO

A

a

36
Q

The lead button is separated from the slag and then treated by this process. This consists of oxidizing fusion in porous vessel
A. parting C. cupellation
B. inquartation D. fusion

A

c

Metallurgy (8 decks)

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