GD&T Runout and Concentricity 2

Question 1

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

Accepted Answer

Circular runout applies to a single cross-section while total runout applies along the entire surface

Answer

Circular runout measures deviation at individual cross-sections, whereas total runout accumulates error across the entire length of the surface.

Question 2

When a runout tolerance is applied to a conical surface, what does the tolerance zone represent?

Accepted Answer

Two lines along the cone surface separated by the tolerance value

Answer

For conical surfaces, the runout tolerance zone consists of two lines on the cone surface separated by the tolerance value, measured perpendicular to the surface.

Question 3

A shaft has a total runout tolerance of 0.05 mm. During inspection, the FIM (Full Indicator Movement) reading is 0.04 mm. The part is:

Accepted Answer

Accepted because the FIM is within the 0.05 mm tolerance

Answer

The part passes because the measured FIM of 0.04 mm is less than the specified total runout tolerance of 0.05 mm.

Question 4

Concentricity is most accurately described as a control of:

Accepted Answer

The median points of diametrically opposed surface elements relative to a datum axis

Answer

Concentricity controls the location of the derived median points of all diametrically opposed surface elements, not the surface itself.

Question 5

Which of the following characteristics makes concentricity difficult to verify?

Accepted Answer

It requires deriving median points from opposing surface elements rather than direct surface measurement

Answer

Finding median points of diametrically opposed elements requires complex calculations, making concentricity verification more difficult than runout.

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

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

GD&T Runout and Concentricity 2