Technical Design & Engineering Principles Flashcards

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

Answer: Flatness

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

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

Answer: Equally in all directions

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

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

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

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

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

Answer: Shot peening

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

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

Answer: A series of short dashes

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

What is the primary purpose of a datum reference frame in GD&T?

Answer: To establish a coordinate system from which measurements are made

A datum reference frame establishes three mutually perpendicular planes that create a coordinate system for locating and orienting part features.

Bernoulli's principle relates an increase in fluid velocity to:

Answer: A decrease in static pressure

Bernoulli's principle states that as fluid velocity increases, its static pressure decreases, since total mechanical energy is conserved.