South Carolina Foundry Technician
Certification License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following materials is most commonly used as a binder in
green sand foundry molds?
A. Sodium silicate
B. Clay
C. Epoxy resin
D. Polyurethane
Clay is the primary binder in green sand molds because it provides
plasticity and cohesion to the sand, allowing it to retain the shape of the
mold during casting.
2. What is the main purpose of a riser in a sand casting process?
A. To serve as a vent for gases
B. To add decorative features
C. To supply molten metal to the casting as it solidifies
D. To reduce the melting point of the metal
A riser ensures that the mold cavity remains filled by compensating for
metal shrinkage during solidification, preventing defects like voids.
, 3. In shell molding, what is the advantage of using fine sand over coarse
sand?
A. Increased permeability
B. Reduced mold strength
C. Improved surface finish
D. Faster cooling
Fine sand in shell molding produces smoother surfaces and more detailed
castings because smaller grains create a more uniform mold shell.
4. Which type of core is typically used to create internal cavities in
complex castings?
A. Green sand core
B. Dry sand core
C. Shell core
D. Metal core
Dry sand cores are pre-baked and can maintain intricate shapes during
metal pouring, making them ideal for forming internal cavities.
5. During the casting of ferrous metals, which defect is most commonly
caused by trapped gases?
A. Cold shut
B. Misrun
C. Blow
D. Sand wash
Blows occur when gases trapped in the molten metal expand and form
cavities, weakening the casting.
6. What is the primary function of a flask in sand casting?
A. To hold molten metal
B. To contain and support the molding sand
, C. To reduce cooling rate
D. To act as a riser
The flask is a rigid frame that holds the sand mold in place, ensuring
dimensional accuracy and stability during pouring.
7. Which metal casting process involves forcing molten metal under high
pressure into a mold?
A. Sand casting
B. Investment casting
C. Die casting
D. Centrifugal casting
Die casting uses high pressure to inject molten metal into precision molds,
allowing for rapid production of complex parts with fine tolerances.
8. In foundry operations, what is “shakeout”?
A. Cooling the metal
B. Inspecting the pattern
C. Removing the casting from the sand mold
D. Cleaning the molten metal
Shakeout is the process of separating the solidified casting from the
surrounding sand mold, often followed by sand reclamation.
9. What property of molding sand primarily affects the permeability of a
mold?
A. Grain shape
B. Grain size
C. Moisture content
D. Binder type
Grain size directly influences how easily gases escape from the mold;
coarser grains increase permeability, while finer grains reduce it.
Certification License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following materials is most commonly used as a binder in
green sand foundry molds?
A. Sodium silicate
B. Clay
C. Epoxy resin
D. Polyurethane
Clay is the primary binder in green sand molds because it provides
plasticity and cohesion to the sand, allowing it to retain the shape of the
mold during casting.
2. What is the main purpose of a riser in a sand casting process?
A. To serve as a vent for gases
B. To add decorative features
C. To supply molten metal to the casting as it solidifies
D. To reduce the melting point of the metal
A riser ensures that the mold cavity remains filled by compensating for
metal shrinkage during solidification, preventing defects like voids.
, 3. In shell molding, what is the advantage of using fine sand over coarse
sand?
A. Increased permeability
B. Reduced mold strength
C. Improved surface finish
D. Faster cooling
Fine sand in shell molding produces smoother surfaces and more detailed
castings because smaller grains create a more uniform mold shell.
4. Which type of core is typically used to create internal cavities in
complex castings?
A. Green sand core
B. Dry sand core
C. Shell core
D. Metal core
Dry sand cores are pre-baked and can maintain intricate shapes during
metal pouring, making them ideal for forming internal cavities.
5. During the casting of ferrous metals, which defect is most commonly
caused by trapped gases?
A. Cold shut
B. Misrun
C. Blow
D. Sand wash
Blows occur when gases trapped in the molten metal expand and form
cavities, weakening the casting.
6. What is the primary function of a flask in sand casting?
A. To hold molten metal
B. To contain and support the molding sand
, C. To reduce cooling rate
D. To act as a riser
The flask is a rigid frame that holds the sand mold in place, ensuring
dimensional accuracy and stability during pouring.
7. Which metal casting process involves forcing molten metal under high
pressure into a mold?
A. Sand casting
B. Investment casting
C. Die casting
D. Centrifugal casting
Die casting uses high pressure to inject molten metal into precision molds,
allowing for rapid production of complex parts with fine tolerances.
8. In foundry operations, what is “shakeout”?
A. Cooling the metal
B. Inspecting the pattern
C. Removing the casting from the sand mold
D. Cleaning the molten metal
Shakeout is the process of separating the solidified casting from the
surrounding sand mold, often followed by sand reclamation.
9. What property of molding sand primarily affects the permeability of a
mold?
A. Grain shape
B. Grain size
C. Moisture content
D. Binder type
Grain size directly influences how easily gases escape from the mold;
coarser grains increase permeability, while finer grains reduce it.
