Computer Aided Drafting Questions and Answers

Answer: C

Snapping to an endpoint, midpoint, centre or intersection makes the connection geometrically exact rather than merely close. Without it a drawing looks correct on screen while containing gaps and overshoots that later operations expose.

Answer: D

Correct answer: the geometry is then inexact though it looks correct

A picked point lands wherever the pixel was, which may be a fraction of a millimetre from the endpoint intended. On screen nothing is visibly wrong, but the line does not actually meet its neighbour - and the gap surfaces later as a hatch that leaks, an area that reports zero, or a model that will not solidify. Snapping to a defined point avoids it entirely.

Answer: A

Correct answer: movement to the horizontal and vertical directions

Ortho constrains each new segment to run at right angles, which makes rectangular geometry quick and exact without any typed coordinates. It is a drawing aid rather than a property of the entity, so it can be toggled at any moment and leaves no trace in the drawing.

Answer: B

Correct answer: a parallel copy at a stated distance

Offset produces a curve everywhere the stated distance from the original - a parallel line, a concentric arc, a similarly shaped polyline. It is the natural way to build a wall thickness, a road kerb or a border, and it preserves the shape rather than scaling it.

Answer: C

Correct answer: it replaces a corner with an arc of stated radius

Fillet trims or extends the two entities as needed and inserts a tangent arc of the given radius between them. A radius of zero simply brings the two to a sharp intersection, which is a useful way of closing a corner that does not quite meet. Chamfer is the corresponding command for a straight bevel.

Answer: D

Correct answer: array

Array copies an entity in a regular pattern - rows and columns for a rectangular array, or about a centre for a polar one. It is the right tool for bolt holes, columns on a grid or a run of identical fittings, and the whole pattern can usually be edited afterwards as one object.

Answer: A

Correct answer: trim shortens an entity to a boundary and extend lengthens it

The two are opposites operating on the same cutting or boundary edge: trim removes the part beyond it, extend carries the entity up to it. Together they are how a rough layout is brought to exact intersections, and using them is a good deal safer than picking the endpoint by eye.

Answer: B

Defining a bolt, a symbol or a standard detail once and inserting it repeatedly saves work and keeps every instance identical. Redefining the block updates every insertion at once, which is its greatest practical benefit.

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.