Question 1

Shell molding is best described by which one of the following:

Accepted Answer

A)  casting operation in which the molten metal has been poured out after a thin shell has been solidified in the mold
B)  casting process in which the mold is a thin shell of sand bonded by a thermosetting resin
C)  sand-casting operation in which the pattern is a shell rather than a solid form
D)  casting operation used to make artificial sea shellsE) None of the above
F) C) and D)

Question 2

Given that Wm = weight of the molten metal displaced by a core and Wc = weight of the core, the buoyancy force is which one of the following:

Accepted Answer

A)  downward force = Wm + Wc
B)  downward force = Wm - Wc
C)  upward force = Wm + Wc
D)  upward force = Wm - WcE) B) and D)
F) B) and C)

Question 3

Cupolas are furnaces used to melt which of the following metals (one best answer) :

Accepted Answer

A)  aluminum
B)  cast iron
C)  steel
D)  zincE) A) and B)
F) B) and C)

Question 4

Which one of the following casting processes is the most widely used:

Accepted Answer

A)  centrifugal casting
B)  die casting
C)  investment casting
D)  sand casting
E)  shell castingF) A) and D)
G) C) and E)

Question 5

Which of the following are advantages of die casting over sand casting (four best answers) :

Accepted Answer

A)  better surface finish
B)  closer tolerances
C)  higher melting temperature metals can be cast
D)  higher production rates
E)  larger parts can be castF) mold can be reusedG) B) and D)
H) B) and F)

Question 6

Investment casting is also known by which one of the following names:

Accepted Answer

A)  fast payback molding
B)  full mold process
C)  lost-foam process
D)  lost-pattern process
E)  lost-wax processF) B) and C)
G) A) and E)

Question 7

For which one of the following reasons is a green mold named:

Accepted Answer

A)  green is the color of the mold
B)  moisture is contained in the mold
C)  the mold is cured
D)  the mold is dryE) A) and B)
F) B) and C) B

Question 8

In plaster mold casting, the mold is made of which one of the following materials:

Accepted Answer

A)  Al2O3
B)  CaSO4-H2O
C)  SiC
D)  SiO2E) A) and C)
F) All of the above

Question 9

Which of the following qualifies as a precision-casting process (two correct answers) :

Accepted Answer

A)  ingot casting
B)  investment casting
C)  plaster-mold casting
D)  sand casting
E)  shell moldingF) B) and D)
G) A) and E)

Question 10

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:

Accepted Answer

A) True 
 B)False

Question 11

Silica sand has which one of the following compositions:

Accepted Answer

A)  Al2O3
B)  SiO
C)  SiO2
D)  SiSO4E) All of the above
F) A) and B)

Question 12

Which one of the following casting metals is most important commercially:

Accepted Answer

A)  aluminum and its alloys
B)  bronze
C)  cast iron
D)  cast steel
E)  zinc alloysF) A) and B)
G) C) and D) C

Question 13

Which of the following casting processes are expendable mold operations (four correct answers) :

Accepted Answer

A)  centrifugal casting
B)  die casting
C)  investment casting
D)  low pressure casting
E)  sand castingF) shell moldingG) slush castingH) vacuum moldingI) None of the above
J) G) and H)

Question 14

Which of the following are metals commonly cast in permanent mold casting (three best answers) :

Accepted Answer

A)  aluminum
B)  brass
C)  gold
D)  magnesium
E)  nickelF) steelG) TungstenH) A) and C)
I) D) and E) A, B, D

Question 15

Which of the following names are applied to a process in which a molten metal is poured into a heated lower die, and the upper die is closed to create the mold cavity only after solidification begins (two correct answers) :

Accepted Answer

A)  liquid-metal casting
B)  liquid-metal forging
C)  rheocasting
D)  squeeze casting
E)  thixocastingF) A) and C)
G) A) and E)

Question 16

Which of the following casting processes are permanent mold operations (two correct answers) :

Accepted Answer

A)  centrifugal casting
B)  expanded polystyrene process
C)  sand casting
D)  shell molding
E)  slush castingF) vacuum molding.G) C) and D)
H) B) and F)

Question 17

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:

Accepted Answer

A)  centrifuge casting
B)  semicentrifugal casting
C)  true centrifugal castingD) All of the above
E) A) and B)

Question 18

Which of the following metals would typically be used in die casting (three best answers) :

Accepted Answer

A)  aluminum
B)  cast iron
C)  steel
D)  tin
E)  tungstenF) ZincG) A) and B)
H) All of the above

Question 19

A misrun is which one of the following defects in casting:

Accepted Answer

A)  globules of metal becoming entrapped in the casting
B)  metal is not properly poured into the downsprue
C)  metal solidifies before filling the cavity
D)  microporosity
E)  "pipe" formationF) All of the above
G) B) and D)

Question 20

An irregularity in the surface of the casting caused by erosion of the sand during pouring is called which one of the following sand casting defects:

Accepted Answer

A)  penetration
B)  sand blow
C)  sand wash
D)  scabsE) A) and B)
F) None of the above

Exam 8: Metal Casting Processes

Shell molding is best described by which one of the following:

Correct AnswerverifiedShow Answer

Given that Wm = weight of the molten metal displaced by a core and Wc = weight of the core, the buoyancy force is which one of the following:

Correct AnswerverifiedShow Answer

Cupolas are furnaces used to melt which of the following metals (one best answer) :

Correct AnswerverifiedShow Answer

Which one of the following casting processes is the most widely used:

Correct AnswerverifiedShow Answer

Which of the following are advantages of die casting over sand casting (four best answers) :

Correct AnswerverifiedShow Answer

Investment casting is also known by which one of the following names:

Correct AnswerverifiedShow Answer

For which one of the following reasons is a green mold named:

Correct AnswerverifiedB

In plaster mold casting, the mold is made of which one of the following materials:

Correct AnswerverifiedShow Answer

Which of the following qualifies as a precision-casting process (two correct answers) :

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

Silica sand has which one of the following compositions:

Correct AnswerverifiedShow Answer

Which one of the following casting metals is most important commercially:

Correct AnswerverifiedC

Which of the following casting processes are expendable mold operations (four correct answers) :

Correct AnswerverifiedShow Answer

Which of the following are metals commonly cast in permanent mold casting (three best answers) :

Correct AnswerverifiedA, B, D

Which of the following names are applied to a process in which a molten metal is poured into a heated lower die, and the upper die is closed to create the mold cavity only after solidification begins (two correct answers) :

Correct AnswerverifiedShow Answer

Which of the following casting processes are permanent mold operations (two correct answers) :

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

Which of the following metals would typically be used in die casting (three best answers) :

Correct AnswerverifiedShow Answer

A misrun is which one of the following defects in casting:

Correct AnswerverifiedShow Answer

An irregularity in the surface of the casting caused by erosion of the sand during pouring is called which one of the following sand casting defects:

Correct AnswerverifiedShow Answer

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Given that W_m = weight of the molten metal displaced by a core and W_c = weight of the core, the buoyancy force is which one of the following:

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B

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C

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A, B, D

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