GD&T Surface Finish & Assembly Requirements 4

Question 1

A part drawing specifies flatness of 0.05 mm on a mounting surface. Flatness controls:

Accepted Answer

How flat the surface is regardless of its location or orientation

Answer

Flatness is a form control that restricts only the shape of the surface without any datum reference, meaning location and orientation are not controlled.

Question 2

For a press-fit pin in a housing, the designer increases the surface roughness of the pin. What is the likely design intent?

Accepted Answer

Increase friction and holding force after pressing

Answer

Higher surface roughness increases the interlocking of asperities in a press fit, which raises the axial and torque holding force of the joint.

Question 3

Which of the following best defines 'waviness' in surface texture measurement?

Accepted Answer

Long-wavelength deviations exceeding the roughness cutoff wavelength

Answer

Waviness consists of longer-wavelength surface irregularities that remain after the roughness (short-wavelength) component is filtered out.

Question 4

A part with a profile of a surface callout referenced to datums A, B, and C controls:

Accepted Answer

Form, orientation, and location simultaneously

Answer

When datums are referenced with a profile of a surface tolerance, it simultaneously controls form, orientation, and location of the surface.

Question 5

In GD&T, the surface texture symbol (check mark shape) without any modification means:

Accepted Answer

Material removal by any process is acceptable

Answer

The basic surface texture symbol (check mark without a bar) indicates that any manufacturing process capable of achieving the specified roughness is acceptable.

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

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

GD&T Surface Finish & Assembly Requirements 4