Technical Design & Engineering Principles Flashcards
7 cards from real ETC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Technical Design & Engineering Principles flashcards as text
In an orthographic projection drawing using third-angle projection (standard in the US), where is the right-side view placed relative to the front view?
Answer: To the right of the front view
In third-angle projection, the right-side view is placed to the right of the front view, as if the object were unfolded outward toward the viewer.
What is the primary difference between a 'detail drawing' and an 'assembly drawing' in engineering documentation?
Answer: Detail drawings show one part with all dimensions; assembly drawings show how parts fit together
A detail drawing fully dimensions a single manufactured part, while an assembly drawing shows the spatial relationships and fit of multiple components without manufacturing dimensions.
Which type of stress occurs when two forces act parallel to a surface in opposite directions, tending to cause one layer of material to slide over an adjacent layer?
Answer: Shear stress
Shear stress acts parallel to a cross-section and tends to cause sliding failure between adjacent material planes.
In engineering design, what is the 'factor of safety' (FOS)?
Answer: The ratio of ultimate (or yield) strength to the actual applied stress
Factor of safety = material strength (ultimate or yield) ÷ actual working stress, providing a margin against unexpected overloads or material variability.
A callout reads '4× Ø0.500 ±0.005'. What does the '4×' prefix indicate?
Answer: There are 4 identical holes with the given diameter
The 'n×' prefix on a drawing callout specifies the quantity of identical features to which the subsequent dimension or note applies.
In thermodynamics, which law states that energy cannot be created or destroyed, only converted from one form to another?
Answer: First Law of Thermodynamics
The First Law of Thermodynamics is the law of conservation of energy: energy input equals work output plus heat losses in a system.
When a design engineer specifies a surface finish of 125 Ra on a machined part, what does 'Ra' represent?
Answer: Arithmetic average roughness of the surface profile
Ra (arithmetic average roughness) is the average absolute deviation of the surface profile from the mean line, measured in microinches or micrometers.