Q35 TO Q68

Question 1

Which one of the following is not a common alloying ingredient in steel: (a) chromium, (b) manganese, (c)
nickel, (d) vanadium, (e) zinc?

Answer 1

zinc

Question 2

The principal strengthening mechanism in highstrength lowalloy (HSLA) steels is which one of the
following: (a) heat treatment, (b) high carbon content, (c) precipitation hardening, (d) solid solution
alloying, or (e) work hardening?

Answer 2

solid solution
alloying

Question 3

The Bayer process is closely associated with the production of which one of the following metals: (a)
aluminum, (b) copper, (c) nickel, (d) titanium, or (e) zinc?

Answer 3

aluminum

Question 4

Which one of the following is not a common element used in aluminum alloys: (a) copper, (b) iron, (c)
silicon, or (d) tungsten?

Answer 4

tungsten

Question 5

Traditional brass is an alloy of copper and which one of the following metallic elements: (a) aluminum, (b)
gold, (c) nickel, (d) tin, or (e) zinc?

Answer 5

zinc

Question 6

Which one of the following metals in the platinum group is the densest material known: (a) iridium, (b)
osmium, (c) palladium, (d) platinum, (e) rhodium, or (f) ruthenium?

Answer 6

osmium

Question 7

The superalloys are widely used in which one of the following applications: (a) artillery shells, (b) cutting
tools, (c) electrical connectors, (d) gas turbines, or (e) refractory liners?

Answer 7

gas turbines

Question 8

Which one of the following is not one of the three metals used as the principal constituent in superalloys:
(a) cobalt, (b) chromium, (c) iron, or (d) nickel?

Answer 8

chromium

Question 9

Pure aluminum is noted for which two of the following properties: (a) high density, (b) high ductility, (c)
high electrical conductivity, (d) high hardness, (e) low ductility, and (f) low electrical conductivity?

Answer 9

high ductility

high electrical conductivity

Question 10

Pure magnesium is noted among metals for which two of the following properties: (a) high hardness, (b)
high strength, (c) low density, (d) low strength, and (e) pretty color?

Answer 10

low density

low strength

Question 11

Copper is extracted from which one of the following ores: (a) chalcopyrite, (b) ilmenite, (c) limonite, (d)
pendlandite, or (e) sphalerite?

Answer 11

chalcopyrite

Question 12

Nickel is extracted from which one of the following ores: (a) ilmenite, (b) magnetite, (c) pendlandite, (d)
rutile, or (e) siderite?

Answer 12

pendlandite

Question 13

Titanium is extracted from which two of the following ores: (a) ilmenite, (b) limonite, (c) magnetite, (d)
rutile, (e) siderite, and (f) sphalerite?

Answer 13

ilmenite

rutile

Question 14

Zinc is noted for which two of the following properties and features: (a) corrosion protection when coated
on steel, (b) good strength at elevated temperatures, (c) high density, (d) low electrical resistivity, and (e)
low melting point?

Answer 14

corrosion protection when coated
on steel

low melting point

Question 15

Zinc alloys are widely used in which one of the following processes: (a) die casting, (b) extrusion, (c)
machining, (d) powder metallurgy, or (e) sheet-metal stamping,

Answer 15

die casting

Question 16

Lead is noted for which two of the following properties and features: (a) high ductility, (b) high elastic
modulus, (c) high strength, (d) high melting point, and (e) X-ray shielding?

Answer 16

high ductility

X-ray shielding

Question 17

Tin is noted for which two of the following properties and features: (a) good ductility, (b) high hardness, (c)
high strength, (d) low melting point, and (e) X-ray shielding?

Answer 17

good ductility

low melting point

Question 18

Which of the following metals has the lowest melting point: (a) lead, (b) tin, or (c) zinc?

Answer 18

tin

Question 19

Which one of the following casting processes is the most widely used: (a) centrifugal casting, (b) die
casting, (c) investment casting, (d) sand casting, or (e) shell casting?

Answer 19

sand casting

Question 20

Relative to the size of the cast part in sand casting, the volumetric size of the pattern is which one of the
following: (a) bigger, (b) same size, or (c) smaller?

Answer 20

bigger

Question 21

The expanded-polystyrene casting process uses a mold of sand packed around a polystyrene foam pattern
that vaporizes when the molten metal is poured into the mold:

Answer 21

True

Question 22

Which three of the following are other names for the expanded-polystyrene casting process: (a) aeratedplastic casting, (b) disappearing-pattern process, (c) evaporative-foam process, (d) lost-foam process, (e)
lost-pattern process, (f) polystyrene-foam molding, and (g) vaporizing-foam casting

Answer 22

lost-foam process

polystyrene-foam molding

vaporizing-foam casting

Question 23

Investment casting is also known by which one of the following names: (a) fastpayback molding, (b)
fullmold process, (c) lostfoam process, (d) lost-pattern process, or (e) lostwax process?

Answer 23

lostwax

Question 24

In plaster mold casting, the mold is made of which one of the following materials: (a) Al2O3, (b) CaSO4H2O,
(c) SiC, or (d) SiO2?

Answer 24

CaSO4H2O

Question 25

An advantage of a plaster mold is that it is permeable, thus allowing escape of gasses from the mold cavity:

Answer 25

False

Question 26

Ceramic-mold casting is similar to plaster-mold casting, except that the mold is made of refractory ceramic materials that can withstand higher temperatures than plaster:

Answer 26

True

Question 27

Steel can be cast in permanent-mold processes, but because of its high melting temperatures, the mold must be made of a refractory material:

Answer 27

True

Question 28

Unlike expendable molds, permanent molds do not collapse, so the mold must be opened before appreciable cooling contraction occurs in order to prevent cracks from developing in the casting:

Answer 28

True

Question 29

In hot-chamber die-casting machines, molten metal is poured into an unheated chamber from an external melting container, and a piston is used to inject the metal under high pressure into the die cavity:

Answer 29

False

Question 30

Low-pressure casting and vacuum permanent-mold casting are similar. Which one uses lower-thanatmospheric air pressure in the mold to draw the molten metal into the cavity: (a) low-pressure casting or (b) vacuum permanent-mold casting?

Answer 30

vacuum permanent-mold casting

Question 31

Which three of the following metals would typically be used in die casting: (a) aluminum, (b) cast iron, (c) steel, (d) tin, (e) tungsten, and (f) zinc?

Answer 31

aluminum tin zinc

Question 32

Which four of the following are advantages of die casting over sand casting: (a) better surface finish, (b) closer tolerances, (c) higher melting-temperature metals can be cast, (d) higher production rates, (e) larger parts can be cast, (f) mold can be reused, and (g) no flash is formed between the die halves?

Answer 32

better surface finish closer tolerances higher production rates mold can be reused

Question 33

Semi-solid metal casting is a family of net-shape and near net-shape processes performed on metal alloys at temperatures between the liquidus and solidus, so that the casting operation is performed on molten metal in which some dendrite formation has already occurred:

Answer 33

False

Question 34

Which one of the following is the name of the casting process in which molten metal is poured into a rotating mold to produce a tubular part: (a) centrifuge casting, (b) semicentrifugal casting, or (c) true centrifugal casting?

Answer 34

true centrifugal casting