Quiz: GD&T Fundamentals | GD&T Fundamentals

1

Which GD&T controls do NOT reference datums?

Orientation controls (parallelism, perpendicularity, angularity) Form controls (straightness, flatness, circularity, cylindricity) Location controls (position) Profile controls (profile of a line, profile of a surface)

2

In a datum reference frame A-B-C, how many degrees of freedom does the primary datum (A) constrain?

1 2 3 6

3

What does the diameter symbol in a tolerance compartment indicate?

The feature being controlled is round The tolerance zone is cylindrical The tolerance value is a diameter Both B and C

4

A hole has a size tolerance of 10.0 +/- 0.2mm and position tolerance of 0.25(M). If the actual hole measures 10.1mm, what is the total position tolerance available?

0.25mm 0.35mm 0.45mm 0.55mm

5

What is the difference between circularity and cylindricity?

Circularity applies to flat surfaces, cylindricity to round surfaces Circularity checks each cross-section independently, cylindricity checks the entire surface Circularity requires a datum, cylindricity does not There is no difference; they are interchangeable

6

Which statement about profile tolerances is TRUE?

Profile of a line is more restrictive than profile of a surface Profile tolerances can never reference datums Profile can control form, orientation, and location simultaneously Profile only applies to flat surfaces

7

What is the primary difference between circular runout and total runout?

Circular runout requires two datums, total runout requires one Circular runout checks individual cross-sections, total runout checks the entire surface Total runout is always a smaller tolerance value Circular runout applies to flat surfaces only

8

In an FCF reading left to right with compartments for perpendicularity, 0.1, A, B — what does A represent?

The tolerance value The primary datum The secondary datum The geometric control type

9

When would you use LMC (Least Material Condition) instead of MMC?

When assembly fit is the primary concern When minimum wall thickness or edge distance is critical When you need the tightest possible tolerance LMC and MMC are interchangeable

10

What is the Virtual Condition for a pin with MMC size of 10.1mm and position tolerance of 0.2mm at MMC?

9.9mm 10.1mm 10.3mm 10.5mm