Computer Aided Drafting Questions and Answers

Answer: C

Correct answer: they all update to the new definition

A block insertion is a reference to a single stored definition, not an independent copy, so editing the definition changes every insertion at once. That is the whole value of blocks - a standard detail corrected in one place is corrected throughout the drawing.

Answer: D

Correct answer: it keeps the referenced drawing as a separate file

A block lives inside the drawing that uses it; an external reference points at a file that stays outside and is loaded when the drawing is opened. So a shared grid or a site plan can be maintained by one person and picked up automatically by every drawing that references it - at the cost of having to keep the file with the drawing.

Answer: A

Correct answer: attaching text information to each insertion

An attribute is a named text field carried by the block whose value is supplied at each insertion, so one door block can record its own reference, size and fire rating. The values can be extracted to a schedule, which makes the drawing the source of the parts list rather than a separate document.

Answer: B

Linking the dimension to the entity means stretching the part revises the figure automatically, which removes a whole class of revision error. A dimension typed as plain text has no such link and will silently disagree with the geometry.

Answer: C

Correct answer: the figure no longer follows the geometry

An associative dimension reports what it measures, so a change to the geometry changes the figure. Typing a value over it breaks that link permanently and silently: the geometry may be revised afterwards and the dimension will go on reporting the old number, with nothing on the drawing to show that it is wrong.

Answer: D

Correct answer: the appearance of arrowheads, text and extension lines

A dimension style governs how a dimension looks - arrowhead form and size, text height and placement, extension line offsets, units and precision - and it is applied by name so that a change propagates to every dimension using it. What it does not touch is the measured value, which comes from the geometry.

Answer: A

Changing a driving dimension causes the model to rebuild itself with the relationships preserved, so design intent is captured rather than merely a picture. In plain drafting the geometry has no memory of why it was drawn as it was.

Answer: B

The relationship survives every subsequent edit, so two lines drawn perpendicular stay perpendicular however the sketch is dragged. Dimensional constraints fix sizes and geometric constraints fix relationships, and a sketch needs both.

Answer: C

Because the solid knows what is material and what is void, it yields volume, mass and centre of gravity and can be sectioned unambiguously. A wireframe carries edges alone and can be read in more than one way, which is its classic defect.

Answer: D

Sweeping a profile along a path or about an axis creates primitives, and union, difference and intersection combine them into the finished shape. It is the standard route from a two-dimensional sketch to a three-dimensional part.