Q. In which casting process is the mold made from a mixture of sand and a binding agent?
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A.
Shell molding
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B.
Green sand casting
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C.
Lost foam casting
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D.
Centrifugal casting
Solution
Green sand casting uses a mixture of sand and a binding agent to create the mold.
Correct Answer:
B
— Green sand casting
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Q. What is a common defect in casting known as shrinkage?
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A.
Excess material on the surface
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B.
Air pockets in the casting
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C.
Reduction in volume as the metal cools
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D.
Inconsistent surface finish
Solution
Shrinkage refers to the reduction in volume of the metal as it cools and solidifies, which can lead to defects.
Correct Answer:
C
— Reduction in volume as the metal cools
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Q. What is the main advantage of using die casting?
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A.
Lower production costs
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B.
High dimensional accuracy
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C.
Easier to change designs
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D.
Better surface finish
Solution
Die casting provides high dimensional accuracy, making it suitable for complex shapes.
Correct Answer:
B
— High dimensional accuracy
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Q. What is the main disadvantage of sand casting?
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A.
High production speed
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B.
Limited to small parts
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C.
Poor surface finish
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D.
High material waste
Solution
Sand casting typically results in a poor surface finish compared to other casting methods.
Correct Answer:
C
— Poor surface finish
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Q. What is the primary purpose of a mold in casting?
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A.
To shape the molten material
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B.
To cool the material
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C.
To add color to the material
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D.
To remove impurities
Solution
A mold is used to shape the molten material into the desired form as it solidifies.
Correct Answer:
A
— To shape the molten material
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Q. What is the purpose of a riser in a casting mold?
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A.
To provide a pathway for molten metal
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B.
To allow for gas escape
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C.
To supply additional molten metal during solidification
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D.
To cool the metal faster
Solution
A riser is used to supply additional molten metal to the casting as it solidifies, preventing shrinkage defects.
Correct Answer:
C
— To supply additional molten metal during solidification
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Q. What is the term for the process of pouring molten metal into a mold?
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A.
Casting
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B.
Forging
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C.
Welding
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D.
Machining
Solution
The process of pouring molten metal into a mold is known as casting.
Correct Answer:
A
— Casting
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Q. Which material is commonly used for making sand molds?
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A.
Steel
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B.
Aluminum
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C.
Silica sand
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D.
Plastic
Solution
Silica sand is commonly used for making sand molds due to its high melting point and ability to withstand heat.
Correct Answer:
C
— Silica sand
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Q. Which of the following is NOT a type of casting process?
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A.
Sand casting
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B.
Investment casting
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C.
CNC machining
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D.
Die casting
Solution
CNC machining is a subtractive manufacturing process, not a casting process.
Correct Answer:
C
— CNC machining
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Q. Which type of casting involves pouring metal into a mold made from a pattern coated with a refractory material?
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A.
Investment casting
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B.
Die casting
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C.
Sand casting
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D.
Permanent mold casting
Solution
Investment casting involves pouring metal into a mold made from a pattern coated with a refractory material.
Correct Answer:
A
— Investment casting
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