GD&T Interview Questions with Answers

Written by PRASANNAKUMAR SHANKAR in Interview Q&A&nbspLast Updated February 15, 2023
GD&T

Prepare for your Interview success with this list of popular GD&T interview questions. A must-read for all mechanical engineers looking for Design, Manufacturing, and Quality related Jobs.

This article lists the Most Popular GD&T Interview Questions with Expert Answers. GD&T, an abbreviation for Geometric Dimensioning and Tolerancing, is one of the most popular and challenging topics. Questions related to GD&T are a must in most mechanical engineer interviews. This article is a must for all mechanical engineers.

List of Most Popular GDT Interview Questions

A) Expert Answers to GD&T Interview Questions – General

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

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

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.

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

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

Q004) Explain the complete form of ASME Y14.5

ASME = American Society of Mechanical Engineers

Y14.5 = Standard Number for GD&T

Q005) Why GD&T?

GD&T is essential

  • To communicate the design intent.
  • Ensure the form, fit, and function of the parts/assemblies.
  • To ensure interchangeability between parts/assemblies.
  • To improve the quality of parts/assemblies.
  • Lowers manufacturing costs.
  • Improves lead time to deliver the parts/assemblies.

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

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

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

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

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

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

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

Q013) What is Geometry?

Geometry is the study of points, lines, angles, surfaces, and solids.

Q014) What is a Dimension?

A dimension is a measurement. For example, a rectangle has 2 dimensions, length, and height.

A circle has one dimension, either diameter or radius. A pin has 2 dimensions, the diameter of the pin and the length of the pin.

Q015) What is a Tolerance?

Tolerance is the allowable variation in a dimension.

Q016) Why should tolerance be provided on dimensions?

Let’s take an example of a pin. The pin has 2 dimensions the diameter of the pin and the length of the pin.

The pin is manufactured by turning on a lathe. Now when the operator is machining the pin on a lathe machine, there could be human and machine errors. Due to these types of errors, it might not be practically possible to achieve the exact dimensions of the pin. Hence it is essential to provide tolerance on dimensions.

Also, note there could be errors in measuring instruments also. For example, even if the pin is manufactured for a theoretically exact dimension, it might not be able to measure that dimension exactly due to errors in measuring instruments. Hence it is essential to provide tolerance on dimensions.

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All the Very Best. I wish you GREAT SUCCESS in your Job Search.

PRASANNAKUMAR SHANKAR

Prasannakumar Shankar is a mechanical engineer with more than 20 years of work experience. In addition, to BE in mechanical engineering, he has an MTech, EMBA, and MS degree (from the State University of New York at Buffalo). He has worked for global multinational companies automotive and aerospace sectors in India and abroad. Prasannakumar Shankar is passionately working towards the success of mechanical engineers by providing them with skill-based online training. Single-handedly, He has created an online school for mechanical engineers - elearn.royal-mechanical.com & https://royal-mechanical.com/

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