ETC Technical Design & Engineering Principles 2

Question 1

Which geometric dimensioning and tolerancing (GD&T) symbol specifies that a surface must lie between two parallel planes?

Accepted Answer

Flatness

Answer

Flatness controls a surface by requiring all points to lie between two parallel planes separated by the tolerance value.

Question 2

In a hydraulic system, Pascal's Law states that pressure applied to a confined fluid is transmitted:

Accepted Answer

Equally in all directions

Answer

Pascal's Law states that pressure exerted on a confined fluid is transmitted undiminished equally in all directions throughout the fluid.

Question 3

A designer specifies a 'limit dimension' on a shaft diameter of 1.500/1.498 inches. What does this indicate?

Accepted Answer

The shaft may be any size between 1.498 and 1.500 inches inclusive

Answer

Limit dimensioning specifies the maximum and minimum permissible sizes directly; any size within that range is acceptable.

Question 4

When designing for fatigue resistance, which surface treatment is most effective at extending a metal component's fatigue life?

Accepted Answer

Shot peening

Answer

Shot peening induces compressive residual stresses on the surface, which counteract tensile stresses that initiate fatigue cracks.

Question 5

On an engineering drawing, a hidden line is represented by:

Accepted Answer

A series of short dashes

Answer

Hidden lines (edges not visible from the viewing direction) are drawn as a series of short dashes per ASME Y14.2 line conventions.

(ETC) Engineering Technician Certification Practice Test