A part drawn at 1:1 occupying 2400 by 1200 mm is to be plotted on an A1 sheet of 841 by 594 mm. The largest suitable standard scale is
Answer: C
At 1:2 the part would need 1200 by 600 millimetres, which exceeds the sheet, while 1:5 gives 480 by 240 and fits with room for the title block and margins. Standard scales are preferred to an exact fit because they are read without arithmetic.
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Match the coordinate entry method with what it measures from.
1. Absolute 2. Relative 3. Polar
P. The previous point, as two offsets Q. The fixed origin R. The previous point, as a distance and angle
Answer: D
Correct answer: 1-Q, 2-P, 3-R
Three ways of naming a point. Absolute entry measures from the fixed origin. Relative entry measures from the previous point as two offsets. And polar entry measures from the previous point as a distance and an angle. The last two share their reference and differ only in how the step is described.
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Match the facility with what it governs.
1. Layer 2. Block 3. Dimension style
P. A named group of entities inserted repeatedly Q. Line type, colour and visibility of a category R. Appearance of arrowheads, text and extension lines
Answer: A
Correct answer: 1-Q, 2-P, 3-R
Three facilities for three different jobs. A layer groups entities by category and controls their line type, colour and visibility together. A block is a named group inserted repeatedly from one definition. And a dimension style governs how dimensions are drawn, without touching what they measure.
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Put the steps of producing a scaled plot from a CAD drawing in order.
1. Set the plot scale to the chosen ratio 2. Choose a standard scale that fits the sheet 3. Create the geometry full size 4. Size the annotation for that plot scale
Answer: B
The geometry comes first at full size, then the scale that will fit the sheet, then the annotation scaled to suit it, and finally the plot setting. Sizing text before the scale is known guarantees having to do it again.
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Consider the following statements about CAD practice.
1. Geometry should be created full size 2. An associative dimension follows the geometry it measures 3. Picking points by eye is acceptable if they look correct on screen
Answer: C
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are sound practice: geometry is drawn full size and scaled only at plotting, and an associative dimension follows what it measures. Statement 3 is the habit the whole discipline exists to prevent - a point that looks right on screen may be a fraction of a unit out, and the error surfaces later in hatching, areas and modelling.
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One of these four is not a reason to use layers. Which is it?
Answer: D
Correct answer: to store the drawing at more than one scale
Layers control category, not scale: they group entities so that line types, colours and visibility can be set together, and so that some categories can be plotted while others are suppressed. Scale is a property of the plot, and geometry should be drawn full size whatever it is eventually plotted at.
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CAD is a genuine improvement on the drawing board in all these respects save one. Which does not apply?
Answer: A
Correct answer: it removes the need to understand projection conventions
CAD draws what it is told, so first and third angle projection, sectioning, hidden detail and the rest remain the draughtsman’s responsibility entirely. What it genuinely gives is revision without redrawing, exact reuse of standard details, and measurement taken directly from the geometry.
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A CAD drawing hatches incorrectly and reports an area of zero for a closed-looking outline. The likely cause is
Answer: B
Correct answer: a gap between two entities at a corner
Hatching and area measurement both need a genuinely closed boundary, and an outline that merely looks closed at screen resolution may have a gap of a fraction of a unit at a corner. Zooming in on each corner, or using the drawing’s own boundary check, finds it - and snapping to endpoints in the first place prevents it.
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A revision stretches a part but the dimension still reads the old figure. The likely explanation is that the dimension was
Answer: C
Correct answer: overridden with typed text rather than left associative
An associative dimension recalculates when the geometry changes, so a figure that has not moved with the stretch cannot be associative. The likeliest cause is that someone typed the value over the measurement, which silently and permanently breaks the link - and nothing on the drawing shows that it has been broken.
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Assertion: annotation must be scaled up when a drawing is to be plotted at a reduction. Reason: the plot reduces every drawn length by the same factor.
Answer: D
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason gives the mechanism. Plotting at 1:50 divides every drawn length by fifty, and annotation is drawn in the same space as the geometry, so it is reduced with everything else. Text intended to finish 3 mm high must therefore be drawn 150 mm high, and the same factor applies to arrowheads and hatch spacing.
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