ME 228 – Computer Graphics Sample Final Exam

Here are the answers to the True / False section:

T: You should always dimension from a finished surface if one is indicated.
T: Interior rounded corners on a part are called fillets.
F: A centerline is only drawn on the view that shows the long axis of a hole. (Centerlines are drawn on all views that show the circular or cylindrical shape of holes or symmetrical features.)
F: All components are cross-hatched with the same pattern in a section assembly view. (Different patterns or orientations are used to distinguish different components in an assembly section view.)
T: A nut is an example of a fastener with an internal thread.
T: A stud is a threaded fastener.
T: Aligned sections in a revolved part means that features such as holes and ribs are rotated into the cutting plane so that they can be viewed in an auxiliary view. (This is a common practice for clarity in revolved sections.)
T: Tolerance stack-up occurs when features are dimensioned in series (one after another or next to each other).
F: Roundness (or circularity) is a tolerance of location and requires the use of a datum. (Roundness is a form tolerance, not a location tolerance, and does not inherently require a datum.)
F: A view is called a half section view if it cuts entirely across an object, regardless of whether the cutting plane literally cuts the object in half. (This describes a full section. A half section cuts halfway through and typically shows both internal and external features.)
F: An assembly drawing should never contain dimensions. (Assembly drawings may contain critical interface or overall dimensions, though detailed manufacturing dimensions are typically on detail drawings.)
F: Full and offset section views always indicate the cutting plane with two arrowheads, while a half section view uses only one arrowhead. (Standard practice for full and offset sections is two arrowheads. Half sections typically use one arrowhead, but the statement specifies "always" and implies that other section types can't use one, which is not strictly true for certain conventions.)
T: Each project is worth 20% of your overall grade in ME 228. (Based on exam overview reference to grades.)
T: Wear of a component is directly affected by surface control.
F: A perspective drawing is one that only has one receding axis. (Perspective drawings typically use one, two, or three vanishing points, meaning multiple receding axes based on the number of vanishing points.)
T: There should be a visible gap between the object and the origin of an extension line.
F: A flathead hole uses a “V” to properly indicate the callout. (The "V" symbol is often associated with countersink, which is used for flathead screws, but the callout itself for a flathead hole would typically involve a countersink depth and angle, not just a 'V' as a standalone indicator.)
F: The nominal size of an object is always the average of the tolerance range. (The nominal size is the theoretical exact size from which limits of size are derived. The average of the tolerance range is the mean size, which may or may not be the nominal size, especially with unilateral tolerances.)
F: Circles on inclined surfaces will appear as circles in at least one of the three principal views. (Circles on inclined surfaces will appear as ellipses in the principal views, unless the inclined surface is perfectly aligned with one of the principal planes, which defeats the 'inclined' aspect.)
F: Because offset section views cut oddly through an object, it is common practice to include hidden lines in them. (Hidden lines are generally omitted in all section views for clarity, as the section is meant to reveal internal features directly, making hidden lines redundant and confusing.)
T: A rib or web is a narrow, flat part that provides support to an object.
T: Legos fit together because they have a locational fit.
T: A spotfaced hole is one that has a larger diameter hole drilled deep enough to provide a flat surface for a mating component.
F: A key is a threaded fastener. (A key is a machine element used to connect a rotating machine element to a shaft, transmitting torque, not a threaded fastener.)
T: Auxiliary views are primarily used to reduce the number of hidden lines in a drawing. (By showing inclined surfaces in true size and shape, auxiliary views often eliminate the need for complex hidden line representations.)
T: A transition fit may have interference.
T: A detail drawing contains information about material.
T: A broken-out section view reveals part of the internal features of an object and is not indicated on another view by a cutting plane line.
F: Lay refers to the basic orientation of the part for assembling. (Lay refers to the direction of the predominant surface pattern produced by a manufacturing process.)
T: An LC fit may have clearance.
F: Solidworks is a solid modeling program because you draw parts much like you’d create them on a sheet of paper. (SolidWorks is a solid modeling program because it designs solid 3D objects, not because it mimics 2D paper drawing, which is generally a different paradigm.)
F: “Hardware” refers to metal materials that are harder than plastics. (Hardware refers to manufactured material items, typically metal, used in construction or in products, encompassing a wide range of applications and not solely defined by hardness relative to plastics.)
T: The symbol \triangle indicates that material must be removed.
T: This symbol \parallel indicates that the lay of the machining must be parallel to the line representing the surface