What are the different types of Geometric Dimensioning and Tolerancing symbols?

Technical
Medium
TCS
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A broad question asking for a list and explanation of GD&T symbol categories.

Why Interviewers Ask This

Proficiency in reading and applying GD&T symbols is essential for engineers. This tests your vocabulary and understanding of symbol meanings.

How to Answer This Question

Categorize symbols: Form (Straightness, Flatness), Orientation (Parallelism, Perpendicularity), Location (Position, Concentricity), Profile, and Runout. Briefly describe the function of each category.

Key Points to Cover

  • Form, Orientation, Location
  • Profile and Runout
  • Symbol functions
  • Standard classification

Sample Answer

GD&T symbols are categorized into Form, Orientation, Location, Profile, and Runout. Form controls include Straightness and Flatness. Orientation covers Parallelism and Perpendicularity. Location includes Position and Concentricity. Profile and Runout control surface variations and rotation. Each symbol defines specific geometric relationships.

Common Mistakes to Avoid

  • Listing symbols without categories
  • Missing key categories
  • Incorrect symbol descriptions

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