Comparing the change of position with the auxiliary plane method, the change of position method
Answer: A
Redrawing the views with the figure tilted or turned until it lies parallel to a plane is the essence of the method. The auxiliary plane method reaches the same result by introducing a new plane instead of moving the figure.
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None of the following preserves the true shape of a plane figure except
Answer: B
Correct answer: a view on a plane parallel to the figure
A figure is projected without foreshortening only onto a plane parallel to itself, so that view alone gives the true shape. A view on a perpendicular plane shows it edge on as a line, and both principal views of a figure inclined to both planes are foreshortened.
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When a plane is perpendicular to a reference plane, its projection on that plane is a/an ______.
DSSSB TGT - 2023,
Answer: B
When a plane is perpendicular to a reference plane, it is seen edge-on from that plane, so its projection there is a straight line. The projection would be a point only for a line (or an edge) perpendicular to the plane, not for a whole plane, and the projection of a flat plane is never a curve. 'Apparent line' is not the standard name, which is why the keyed answer is the plain straight line. In descriptive geometry, a plane is shown as a line in a view where it is edge-on, which happens when it is perpendicular to the plane of projection.
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