Mechanical Engineering Interview Questions and Answers - GD&T

Mechanical Engineering Interview Questions and Answers - Geometric Dimensioning and Tolerancing (GD&T)

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Q001) What is the complete form of GD and T?

GD & T is the abbreviation used for Geometric Dimensioning and Tolerancing.

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Q002)  What are GD & T?

GD & T are a set of symbols.

GD & T are indicated on engineering drawings.

GD & T defines Tolerances of Form, Orientation, Location, and Run-out.

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Q003) Which GD&T standard does the industry use?

For GD&T, most industries use the ASME Y14.5 standard.

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Q004) Explain the complete form of ASME Y14.5

ASME = American Society of Mechanical Engineers

Y14.5 = Standard Number for GD&T

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Q005) Why GD&T?

GD&T is essential

*to communicate the design intent.

*to ensure the form, fit, and function of the parts/assemblies.

*to ensure interchangeability between parts/assemblies.

*to improve quality of parts/assemblies.

*lowers manufacturing costs.

*improves lead time to deliver the parts/assemblies.

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Q006) How many types of GD&T are there? What are they?

           There are five types of GD&T. They are

  1. Tolerances of FORM
  2. Tolerances of PROFILE
  3. Tolerances of ORIENTATION
  4. Tolerances of LOCATION
  5. Tolerances of RUN-OUT

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Q007) How many types of FORM Tolerances are there? What are they?

There are three types of FORM Tolerance. They are

  1. Straightness
  2. Flatness
  3. Circularity
  4. Cylindricity

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Q008) How many types of PROFILE Tolerances are there? What are they?

There are two types of PROFILE Tolerance. They are

  1. Profile of a Line
  2. Profile of a Surface

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Q009) How many types of ORIENTATION Tolerances are there? What are they?

There are three types of ORIENTATION Tolerance. They are

  1. Angularity
  2. Perpendicularity
  3. Parallelism

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Q010) How many types of LOCATION Tolerances are there? What are they?

There are three types of FORM Tolerance. They are

  1. Position
  2. Concentricity
  3. Symmetry

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Q011) How many types of RUN-OUT Tolerances are there? What are they?

There are two types of RUN-OUT Tolerance. They are

  1. Circular Run-out
  2. Total Run-out

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Q012) How many GD&T symbols are there? What ae they?

There are fourteen types of GD&T symbols. They are

  1. Straightness
  2. Flatness
  3. Circularity
  4. Cylindricity
  5. Profile of a Line
  6. Profile of a Surface
  7. Angularity
  8. Perpendicularity
  9. Parallelism
  10. Position
  11. Concentricity
  12. Symmetry
  13. Circular Run-out
  14. Total Run-out

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