Option 1 : V.T. will be perpendicular to the reference line

CT 3: Building Materials

3014

10 Questions
20 Marks
12 Mins

Traces of planes:

The lines in which the planes meet the reference planes (H.P. and V.P.) are called the traces of the planes.

**Horizontal trace (H.T.):**The intersection of a plane with the horizontal plane (H.P.)**Vertical Trace (V.T.):**The intersection of a plane with the vertical plane (V.P.)

1. When a plane is perpendicular to the H.P. and parallel to the V.P., it has only H.T. and no V.T.

2. When a plane is perpendicular to the V.P. and parallel to the H.P., it has only V.T. and no H.T.

3. When a plane is perpendicular to both the reference planes, it has both V.T. and H.T. and they are in a straight line.

4. When a plane is perpendicular to the H.P. and inclined to the V.P., it has V.T. and H.T. The V.T. is perpendicular to xy line (reference line) and the H.T. makes a true angle with the V.P. i.e. xy line.

5. When a plane is perpendicular to the V.P. and inclined to the H.P., it has H.T. and V.T. The H.T. is perpendicular to xy line (reference line) and the V.T. makes a true angle with the H.P. i.e. xy line.