1. What is the primary purpose of a datum in GD&T?

A. To represent the ideal feature size B. To provide a reference for tolerance zones C. To show surface roughness D. To indicate a material condition

2. What is the symbol for the geometric tolerance of symmetry?

A. ∥ B. ⊥ C. ◊ D. 𝑆

3. When using a positional tolerance, the feature tolerance zone is typically:

A. A 2D rectangle B. A square C. A cylindrical area around the true position D. A flat plane

4. Which of the following conditions does LMC represent in GD&T?

A. The maximum allowable material B. The minimum allowable material C. A datum reference condition D. Material condition independent of size

5. Which of the following is not a type of geometric tolerance?

A. Form B. Orientation C. Size D. Location

6. In GD&T, the term "bonus tolerance" is associated with which modifier?

A. LMC B. MMC C. RFS D. Datum

7. What does the symbol Ⓜ signify in GD&T?

A. Minimum material condition B. Material condition not applicable C. Maximum material condition D. Mean material condition

8. Which tolerance controls the amount of variation in a feature's axis or centerline?

A. Position B. Concentricity C. Straightness (of an axis) D. Circularity

9. Which geometric characteristic symbol is used for runout tolerance?

A. ⌀ B. ⌰ C. ◔ D. ⑀

10. Which tolerance ensures that two or more features share a common axis or center point?

A. Parallelism B. Concentricity C. Circularity D. Cylindricity

11. Which type of tolerance ensures that a hole is evenly round at every cross-section?

A. Cylindricity B. Circularity C. Concentricity D. Position

12. Which of the following geometric tolerances is used to control the location of a feature relative to a datum?

A. Flatness B. Circularity C. Position D. Cylindricity

13. In GD&T, which modifier allows the largest possible tolerance zone when a feature is at its least material condition?

A. MMC B. LMC C. RFS D. None of the above

14. Which geometric tolerance ensures that all points on a surface are equidistant from a datum plane?

A. Straightness B. Parallelism C. Flatness D. Profile of a surface

15. What does the term "virtual condition" mean in GD&T?

A. The smallest size of a feature with no tolerance applied B. The worst-case boundary of a feature when considering the combined effects of size and geometric tolerances C. The actual size of a feature during inspection D. The midpoint between MMC and LMC

16. Which geometric control is best suited for ensuring a feature is at a specified angle relative to a datum?

A. Parallelism B. Angularity C. Perpendicularity D. Cylindricity

17. The geometric characteristic symbol for straightness is:

A. ⊥ B. ∥ C. — D. ◯

18. What does the term MMC stand for in GD&T?

A. Minimum Material Condition B. Maximum Material Condition C. Mean Material Condition D. Marginal Material Condition

19. A cylindrical feature must be controlled for straightness. Which tolerance should you use?

A. Cylindricity B. Circularity C. Total runout D. Straightness

20. Which symbol is used to represent parallelism in GD&T?

A. ∥ B. ⊥ C. ☐ D. ◯

21. What is the meaning of a feature control frame in GD&T?

A. A graphical representation of material removal B. A tool used for 3D inspection C. A rectangular box that contains the geometric tolerance information D. A machining specification

22. Which symbol is used to represent total runout?

A. ⌰ B. ◔ C. ◉ D. ⌯

23. Which of the following is true about a datum target?

A. It is a theoretical plane or axis B. It specifies the exact size of a feature C. It defines a point, line, or area used to establish a datum D. It is only applicable to profile tolerances

24. Which geometric control limits the amount a surface or axis can deviate from being parallel to a datum?

A. Straightness B. Perpendicularity C. Parallelism D. Angularity

25. When a flatness tolerance is specified, the surface must lie between:

A. Two parallel planes B. Two concentric cylinders C. A spherical surface D. Two intersecting planes

26. Which type of tolerance ensures that the angle between two features is within limits?

A. Angularity B. Flatness C. Cylindricity D. Circularity

27. What does a total runout tolerance control?

A. The roundness of a cylindrical feature at each cross-section B. The uniformity of a surface across its entire length and circumference C. The position of a feature D. The flatness of a surface

28. Which symbol represents cylindricity in GD&T?

A. ○ B. ⌀ C. ◯ D. None of the above

29. Which tolerance ensures that a feature lies within a specified distance from a datum plane or axis?

A. Concentricity B. Parallelism C. Positional tolerance D. Profile tolerance

30. A positional tolerance with the MMC modifier allows for:

A. A larger tolerance zone as the feature size approaches LMC B. A fixed tolerance zone regardless of feature size C. No tolerance zone adjustments D. A larger tolerance zone as the feature size approaches MMC

31. What does the "regardless of feature size" (RFS) modifier mean in GD&T?

A. The tolerance applies regardless of the actual size of the feature within its limits B. The feature must be produced at its MMC C. The tolerance increases as the feature size approaches LMC D. The datum must be inspected first

32. In GD&T, what does RFS stand for?

A. Regardless of Feature Size B. Rotational Feature Size C. Restricted Feature Size D. Relevant Feature Shape

33. Which geometric characteristic is used to control the form of a straight line?

A. Straightness B. Flatness C. Perpendicularity D. Concentricity

34. A cylindrical feature is controlled for both circularity and straightness of its axis. Which tolerance should you specify?

A. Straightness B. Circularity C. Cylindricity D. Total runout

35. The primary advantage of GD&T over traditional dimensioning is:

A. It provides looser tolerances for all features B. It simplifies manufacturing processes C. It ensures functional relationships between parts D. It eliminates the need for datum references

36. Which of the following tolerances applies to coaxial features?

A. Flatness B. Concentricity C. Cylindricity D. Circular runout

37. What is a datum in GD&T?

A. A specific part of a feature's geometry B. A theoretical point, axis, or plane C. A measurement standard D. A machining tool

38. What does a profile tolerance control in GD&T?

A. Form only B. Form and orientation only C. Form, orientation, and location D. Form, orientation, location, and size

39. What does the term "true position" refer to in GD&T?

A. The center of a tolerance zone B. The measured position of a feature C. The intended location of a feature D. The average location of multiple features

40. The feature control frame includes all of the following except:

A. Geometric characteristic B. Tolerance value C. Material condition modifier D. Manufacturing process

41. In a feature control frame, what does the first compartment represent?

A. Datum reference B. Tolerance value C. Geometric characteristic D. Material condition

42. What is the primary purpose of GD&T?

A. To specify surface roughness B. To ensure the interchangeability of parts C. To indicate material type D. To minimize production cost

43. What is the main difference between profile of a line and profile of a surface?

A. Profile of a line applies to a 2D section, while profile of a surface applies to the entire 3D surface B. Profile of a surface controls flatness only, while profile of a line controls angularity C. Profile of a line applies to flat features only D. There is no difference between the two

44. In GD&T, the perpendicularity symbol is represented by which of the following?

A. ☐ B. ∥ C. ⊥ D. ⌀

45. The maximum permissible variation in a feature's size, including its geometric tolerances, is referred to as:

A. Allowance B. Virtual condition C. Actual size D. Tolerance zone

46. What does a profile of a surface tolerance control?

A. Flatness only B. Roundness and straightness only C. A 3D tolerance zone for a complex surface D. Concentricity of two circular features

47. What does the symbol ∅ control in GD&T?

A. Surface flatness B. Circular features C. Angular relationships D. Positional tolerance

48. What is the purpose of using a profile tolerance?

A. To control size variation B. To control the shape of a surface C. To control the straightness of an axis D. To control perpendicularity

49. When a feature is specified with a flatness tolerance, what is being controlled?

A. Its size B. Its orientation C. The uniformity of a surface D. Its position relative to a datum

50. Which type of tolerance applies to a spherical surface?

A. Cylindricity B. Circularity C. Sphericity D. Profile of a surface

51. Which symbol represents angularity in GD&T?

A. ∥ B. ⊥ C. ⌰ D. ∠

52. What does the flatness tolerance control?

A. The evenness of a surface B. The angle between two surfaces C. The circularity of a feature D. The position of a feature

53. The symbol ⊥ in GD&T represents which geometric control?

A. Parallelism B. Flatness C. Perpendicularity D. Angularity

54. What is the symbol for the least material condition (LMC) modifier?

A. Ⓜ B. Ⓛ C. Ⓡ D. Ⓑ

55. In GD&T, which symbol indicates a reference datum?

A. [ ] (Box around a letter) B. ⊥ C. ∠ D. ⊗

56. In GD&T, what does the symbol ⌀ represent?

A. Circularity B. Diameter C. Flatness D. Cylindricity

57. Which tolerance controls the roundness of a cylindrical feature?

A. Cylindricity B. Circularity C. Total runout D. Angularity

58. Which of the following is a form tolerance?

A. Position B. Concentricity C. Flatness D. Symmetry

59. In GD&T, what does a "datum feature simulator" represent?

A. The actual measured feature used during inspection B. A theoretical perfect representation of a datum C. The physical device that replicates the datum for inspection D. A standard material property

60. What is the difference between circular runout and total runout?

A. Circular runout controls a single cross-section, while total runout controls the entire feature B. Circular runout applies to flat surfaces only, while total runout applies to cylindrical surfaces C. Total runout applies only to positional tolerance D. Circular runout and total runout are identical

61. How many datum features are typically used to fully constrain a part in 3D space?

A. One B. Two C. Three D. Four

62. Cylindricity tolerance ensures that:

A. A cylinder's diameter is consistent along its axis B. A cylinder's axis is straight C. A cylinder's surface is equally spaced from its axis D. A cylinder's axis is perpendicular to a datum

63. Which datum feature should be selected first in a GD&T scheme?

A. The most complex feature of the part B. The feature that provides the most stability during inspection and assembly C. The largest feature of the part D. A feature that is difficult to machine

64. What is the unit of measurement typically used in GD&T?

A. Inches or millimeters B. Grams C. Degrees Celsius D. Pounds

65. A composite tolerance is used to:

A. Specify flatness and parallelism in one callout B. Control both position and orientation in a single feature C. Allow multiple interpretations of a tolerance zone D. Specify tolerance zones at different scales

66. Which of the following is true about concentricity?

A. It is easier to inspect than position B. It controls the center axis of one feature relative to another C. It specifies the evenness of a flat surface

67. Which geometric tolerance ensures that the axis of a hole aligns with the axis of a pin inserted into it?

A. Concentricity B. Position C. Angularity D. Parallelism

68. What does the profile of a line tolerance control?

A. Surface parallelism B. The uniformity of a line across its entire length C. The axis of a cylindrical feature D. Positional deviation of a hole

69. What is stack-up analysis, and why is it important in mechanical design?

A. To estimate and control accumulated tolerances in an assembly B. To determine material hardness C. To define a part’s surface finish D. To analyze the electrical conductivity of materials

70. What are the two main types of tolerance stack-ups?

A. Linear and Angular B. Worst-Case and Statistical C. Nominal and Maximum Material Condition D. Direct and Indirect

71. What is the difference between worst-case and statistical tolerance analysis?

A. Worst-case assumes all tolerances are at their extreme limits, while statistical uses probability B. Statistical analysis assumes all dimensions are perfect C. Worst-case considers only nominal values D. Statistical analysis gives no improvement over worst-case

72. In which industries is tolerance stack-up analysis most commonly used?

A. Aerospace, Automotive, and Medical Device Manufacturing B. Software Development C. Food Processing D. Textile Manufacturing

73. How does stack-up analysis help improve manufacturability and assembly?

A. By eliminating the need for tolerances B. By ensuring parts fit together properly and function correctly C. By removing the need for GD&T D. By increasing the number of rejected parts

74. What role does GD&T play in stack-up analysis?

A. It allows the use of looser tolerances B. It helps define how tolerances accumulate in an assembly C. It eliminates the need for tolerance stack-ups D. It only applies to 2D drawings

75. What are the key assumptions made in worst-case tolerance stack-up analysis?

A. All tolerances are at their maximum limits at the same time B. Some tolerances cancel each other out C. Manufacturing errors do not exist D. Nominal dimensions are always achieved

76. What is the impact of thermal expansion on stack-up analysis?

A. It has no effect B. It can cause dimensional changes in components C. It only affects plastic materials D. It only applies to non-metallic parts

77. What is bonus tolerance in GD&T?

A. An extra tolerance added to all dimensions B. The additional tolerance gained when a feature departs from its Maximum Material Condition (MMC) C. A special type of geometric tolerance applied to flatness D. A tolerance that applies only to threaded holes

78. Which modifier is used to indicate that bonus tolerance applies?

A. Ⓑ (Bonus) B. Ⓜ (MMC) C. Ⓛ (LMC) D. ⌰ (Total Runout)

79. How does bonus tolerance affect the positional tolerance of a hole?

A. It reduces the tolerance when the hole is at MMC B. It increases the tolerance as the hole moves away from MMC C. It eliminates the need for GD&T D. It only applies to perpendicularity, not position

80. Which of the following conditions must be met for bonus tolerance to apply?

A. The feature must be at its Least Material Condition (LMC) B. The feature must be specified with the MMC modifier C. The feature must have a profile tolerance applied D. The feature must be perfectly manufactured to its nominal dimension