gdt basic skill survey

© The QC Group, Inc. All rights reserved 5950 Clearwater Drive Suite 300, Minnetonka, MN 55343 • (952) 895-1150 ph (952) 895-1152 fax

Rev. 3 of 4

Name: ___________________________ Date: _____________ Company: ________________________ Phone: ____________

Email: _________________________________________________

Basic Level GD&T Skills Survey

Questions 1-16 are multiple choice questions. Circle the best answer. 1. The use of GD&T helps to assure which of the following? A. Function B. Form of the feature C. Fit between mating parts D. Location of features of size E. All of the above 2. What is the MMC of a shaft size of .500 +/- .005? A. .500 B. .495 C. .505 D. None of the above 3. A datum target point is simulated with a __________ gage pin.

A. spherical-tipped B. cylindrical C. conical-tipped D. flat-tipped

4. What type of fastener formula should be used when one part has a tapped hole and the mating

part has a clearance hole? A. Threaded formula B. Fixed Fastener formula C. Floating Fastener formula D. None of the above 5. If a .62-.64mm hole is located with .05mm positional tolerance modified at MMC, and the hole

diameter measures .63, what is the total permissible positional tolerance? A. .04 B. .05 C. .055 D. .06


Rev. 3 of 4

6. The MMC concept does not apply to A. Perpendicularity B. Flatness C. Parallelism D. All of the above 7. How many points of contact are required to establish a secondary datum on a rectangular-

shaped part? A. 1 B. 2 C. 3 D. 4 8. Rule #1 states that. . .

A. perfect form at MMC is required B. perfect form at MMC not required C. RFS is the default condition D. RFS is optional

Questions 9 - 11 refer to the drawing at the right. 9. Datum A is. . .

A. The right edge (plane) of the part B. a planar datum C. the centerplane of the 62 - 60 width D. the centerplane of a 62 wide boundary

10. The amount of datum shift permissible for the

Position control is. . . A. 1.0 B. 2.0 C. 3.4 D. 4.0

11. The amount of bonus tolerance permissible for the Position control is. . .

A. 1.4 B. 2.0 C. 0.3 D. 1.0


Rev. 3 of 4

12. Whenever a Position control is used without a modifier, A. The tolerance is subject to accumulation B. No bonus tolerance is available C. Tolerance zone is projected to the stated depth D. All of the above 13. The _______________ contains the tolerances for geometric controls.

A. Title Block B. Revision Block C. Feature Control Frame D. None of the above

Questions 14-16 refer to the drawing to the right. 14. The maximum amount of datum shift

permissible with the TOP control is. . . A. 0.1 B. 0.2 C. 0 D. 0.6

15. The tolerance value in the perpendicularity control is. . .

A. illegal – this is impossible to manufacture

B. applied at RFS C. effective in reducing scrap D. applied at LMC

16. The parallelism control. . .

A. limits the flatness of the surface to 0.1

B. overrides Rule #1 C. does not control the flatness of the surface D. is illegal


Rev. 3 of 4

Questions 17 - 25 are true or false. Circle the correct answer.

17. The tolerance zone for a Circularity is always T F two coaxial cylinders 18. Coordinate tolerancing should be used to locate critical holes. T F 19. 12.2 – 12.3 is a plus-minus tolerance. T F 20. The tangent plane modifier is not used with the flatness control. T F

21. The tolerance zone for a Straightness control is two parallel lines. T F 22. Profile of a Surface controls form, orientation, size and location. T F 23. Basic dimensions are not used to locate datum targets. T F 24. Tolerances for basic dimensions are located in the title block. T F 25. A feature control frame must contain at least one datum T F

reference and no more than three.

gdt basic skill survey

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