Question:
Surfaces to be machined are marked on the pattern by which of the following colour?
Surfaces to be machined are marked on the pattern by which of the following colour?
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Red = Ready for machining. Black = Basic/Unfinished. Yellow = Core.
Updated On: Jul 4, 2026
- Black
- Red
- Yellow
- blue
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The Correct Option is B
Solution and Explanation
Step 1: Concept Pattern color coding is a standardized system used in foundries to provide instructions to the molder about the casting's final requirements.
Step 2: Meaning Different colors on a pattern indicate different features, such as surfaces to be left as-cast, surfaces requiring machining, or the location of cores.
Step 3: Analysis According to standard color codes, black is typically used for surfaces to be left unfinished, while yellow is used for core prints. Red is the industry-standard color designated for surfaces that will undergo subsequent machining operations.
Step 4: Conclusion Therefore, surfaces intended for machining are marked on the pattern in red. Final Answer: (B)
Step 2: Meaning Different colors on a pattern indicate different features, such as surfaces to be left as-cast, surfaces requiring machining, or the location of cores.
Step 3: Analysis According to standard color codes, black is typically used for surfaces to be left unfinished, while yellow is used for core prints. Red is the industry-standard color designated for surfaces that will undergo subsequent machining operations.
Step 4: Conclusion Therefore, surfaces intended for machining are marked on the pattern in red. Final Answer: (B)
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