What is a block attribute used for?
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.
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What makes a dimension associative?
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.
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Why is overriding a dimension's measured value with typed text dangerous?
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.
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What does a dimension style control?
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.
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How does parametric modelling differ from plain drafting?
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.
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What does a geometric constraint such as perpendicularity do in a parametric sketch?
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.
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What distinguishes a solid model from a wireframe model?
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.
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Which two operations are the basis of constructive solid geometry?
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.
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What does a drawing exchange format exist to do?
Answer: A
Each system has its own native format, so a neutral one is needed when a drawing must pass between organisations. Some information, particularly parametric relationships, is commonly lost in the translation, which is the standing limitation of the approach.
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From a point at 40,30 a relative entry of 60,20 places the next point at
Answer: B
Correct answer: 100,50
Relative entry adds the offsets to the previous point: \[ (40 + 60,\ 30 + 20) = (100,\ 50). \] Entering the same figures as absolute coordinates would place the point at 60,20 instead, which is the distractor immediately below and the standard slip.
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