Discussion
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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