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The first and the third quadrants are always opened out while rotating the planes.

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The first and the third quadrants are always opened out while rotating the planes.

(a) True

(b) False

The question was posed to me in an online quiz.

This key question is from Planes of Projections and Four Quadrants topic in portion Loci of Points & Orthographic Projections of Engineering Drawing

1 Answer

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Right choice is (a) True

Easy explanation: According to the standards it is made that the planes rotate in a clockwise direction while drawing the orthographic projections of objects on the different quadrant. So as the horizontal rotates 90 degrees in clockwise with respect to reference line the views in 2nd and 4th quadrants overlap but in 1st and 3rd the views will not coincide so they are said to be opened.

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