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A solid whose axis appears as a point in the elevation has that axis

  • A.perpendicular to the vertical plane
  • B.perpendicular to the horizontal plane
  • C.parallel to both principal planes
  • D.inclined to both principal planes

Answer: A

Correct answer: perpendicular to the vertical plane

A line perpendicular to a plane of projection appears on it as a point, so an axis showing as a point in the elevation must be perpendicular to the vertical plane. It would then appear in true length in the plan. The corresponding case in the other view is the axis perpendicular to the horizontal plane, which shows as a point in the plan.

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