Computer Aided Drafting Questions and Answers

Answer: A

Putting centre lines, hidden detail, dimensions and hatching on their own layers lets each be given its line type and colour once and be turned off when not wanted. It is what makes one drawing serve several purposes without being redrawn.

Answer: B

Assigning the property to the layer means every entity on it follows automatically and a revision affects them all together. Overriding the property entity by entity is possible but scatters the control and makes later changes laborious.

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.