A shaft 600 mm long drawn at 1:5 with a conventional break occupies, on the sheet, a length that is
Answer: A
At 1:5 the full length would be 120 millimetres, and the break removes part of the middle so the drawn figure is shorter. The dimension written on it remains 600 millimetres, since the break is a drawing convention only.
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Adjacent sectioned parts in an assembly are hatched
Answer: B
Correct answer: in opposite directions or at different spacings
Hatching in the same direction and spacing across a joint would make two parts look like one. Reversing the direction, or changing the spacing where several parts meet, makes the boundary between them unmistakable. The same part must of course be hatched identically wherever it appears in the assembly.
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Match the line type with what it represents.
1. Long chain thin line 2. Short-dashed thin line 3. Continuous thick line
P. Hidden edge Q. Centre line R. Visible outline
Answer: C
Correct answer: 1-Q, 2-P, 3-R
Three line types with three distinct meanings, and the distinction is carried by both the pattern and the weight. A long chain thin line is a centre line. A thin line of short dashes is a hidden edge. A continuous thick line is a visible outline. Where two coincide the visible outline takes precedence, then the hidden edge, then the centre line.
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Match the section with its description.
1. Half section 2. Offset section 3. Revolved section
P. Cutting plane stepped through several features Q. Interior and exterior shown in one view R. Cut shape rotated and drawn in place
Answer: D
Correct answer: 1-Q, 2-P, 3-R
Three sectioning devices for three different problems. A half section shows interior and exterior together on a symmetrical part. An offset section steps the cutting plane so that features not on one plane can all appear in a single view. And a revolved section rotates the cut shape through ninety degrees and draws it in place on the view.
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Put the steps of laying out an orthographic drawing in order.
1. Project the remaining views from it 2. Choose the front view showing the characteristic shape 3. Add dimensions, conventions and the title block 4. Decide the minimum number of views needed
Answer: A
The front view is settled first because everything else is projected from it, then how many further views the shape requires, then those views, then the annotation. Dimensioning last avoids reworking it as views change.
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Consider the following statements about orthographic projection.
1. In first angle the plan lies below the front view 2. A visible outline takes priority over a coinciding hidden edge 3. Chain dimensioning avoids the accumulation of tolerances
Answer: B
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: in first angle the plan falls below the front view, and a visible outline takes precedence over a coinciding hidden edge. Statement 3 is the reverse of the truth - chain dimensioning is precisely the arrangement in which tolerances accumulate, and datum dimensioning is what avoids it.
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Which of the following is NOT one of the six principal views?
Answer: C
Correct answer: an auxiliary view of an inclined face
The six principal views are those taken along the three mutually perpendicular axes from either end: front, rear, left, right, top and bottom. An auxiliary view is taken normal to an inclined face rather than along a principal axis, precisely so that the face appears in its true shape, and it is drawn in addition to the principal views.
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Three of the following are conventionally left unsectioned. The exception is
Answer: D
Correct answer: the wall of a hollow casting
The wall of a casting is exactly what a section exists to show, so it is hatched in the ordinary way. The other three are among the parts conventionally left unsectioned: a bolt, a key and a web cut along its length would all show as meaningless solid hatching, and in the case of the web would wrongly suggest a solid flange.
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A machined part arrives as a mirror image of the drawing though every dimension is correct. The likely cause is
Answer: A
Correct answer: the projection system was misread
A mirror image with every dimension correct is the signature of a first angle drawing read as third angle, or the reverse: the side views are transposed left for right, so the part is made handed the wrong way round. It is why the projection symbol belongs in the title block of every drawing, and why it should be checked before work begins.
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A drawing shows the same overall length dimensioned as 240 mm on one view and 245 mm on another. The correct action is
Answer: B
Correct answer: query the drawing, since a dimension must appear once only
Two different figures for the same length mean the drawing is wrong, and nothing on it says which figure is right - one of them is probably a revision that was not carried through. Averaging, or choosing the safer-looking value, is guessing at the designer’s intent. The rule that a dimension appears once exists precisely to prevent this situation arising.
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