GD&T Material Condition Modifiers 3

Question 1

The term 'resultant condition' for an internal feature controlled at MMC refers to:

Accepted Answer

The worst-case inner boundary considering both size and geometric tolerance

Answer

The resultant condition of an internal feature at MMC is the worst-case inner boundary = LMC size minus the maximum allowable tolerance.

Question 2

Which of the following GD&T tolerances is most commonly applied with an MMC modifier to take advantage of bonus tolerance for assembly purposes?

Accepted Answer

True Position

Answer

True position is most commonly modified with MMC because assembly clearance naturally increases when mating features depart from MMC.

Question 3

An LMC modifier is most useful for controlling which engineering concern?

Accepted Answer

Minimum wall thickness and edge distance

Answer

LMC ensures minimum material (wall thickness, edge distance) is maintained, making it useful for structural or sealing concerns.

Question 4

A pin (external feature) has a size range of 9.9–10.0 mm. At MMC, the straightness tolerance is 0.05 mm. What is the maximum allowable straightness tolerance when the pin measures 9.9 mm?

Accepted Answer

0.15 mm

Answer

At 9.9 mm (LMC), departure from MMC is 0.1 mm; adding this bonus to 0.05 mm gives 0.15 mm total.

Question 5

Which boundary is established by the MMC size of an external feature PLUS its applicable geometric tolerance?

Accepted Answer

Outer boundary / Virtual condition

Answer

For an external feature at MMC, the virtual condition (worst-case outer boundary) equals MMC size plus the geometric tolerance.

(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test

(GD&T) Geometric Dimensioning and Tolerancing Certification Practice Test

GD&T Material Condition Modifiers 3