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If the apparent and the true inclinations of a line with HP are equal, the line is ____________

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If the apparent and the true inclinations of a line with HP are equal, the line is ____________

(a) parallel to horizontal plane

(b) parallel to vertical plane

(c) parallel to profile plane

(d) inclined to both reference plane

I got this question in an interview for job.

My question is from Projection of Straight Lines in portion Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing

1 Answer

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Best answer
The correct answer is (b) parallel to vertical plane

Explanation: When the line is parallel to the vertical plane and perpendicular to HP then it will form a point projection on the HP and so the apparent and the true inclination will be same of the line as it will resemble a point projection.

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