BT-105 (GS) – Engineering Graphics

The distance between two stations is 100 km and on a road map it is shown by 30 cm. Draw a diagonal scale and indicate 46.8 km and 32.4 km on it.

Draw an epicycloids, given that radii of generating and directing circle as r = 20 mm and R = 72 mm respectively. Also draw a normal and tangent at any point on the curve.

A thread is unwinds itself from a cylindrical drum of 60 mm in radius. Draw the locus of the free end of the thread for unwinding through an angle of 180°.

Differentiate between the first angles and third angles projection.

A line AB 120 mm long is inclined at 45° to HP and 30° to the VP. It's midpoint P is in VP and 20 mm above HP. The end A is in the third quadrant and B is in the first quadrant. Draw the projections of the line AB.

Explain layering concept with examples. How is it implemented in CAD software?

Draw the projections of a regular hexagon of 25 mm side having one of its sides in the H.P. and inclined at 60° to the V.P. and its surface making an angle of 45° with the H.P.

Draw the projections of a rhombus having 100 mm and 40 mm long diagonals. The bigger diagonal is inclined at 30° to H.P. with one of the end point in H.P. and the smaller diagonal is parallel to both the planes.

A right pentagonal prism 90 mm high with each side of the base 30 mm is resting on one of the base edges on the horizontal plane and inclined at 30° to V.P. and the face containing that edge is inclined at 45° to the H.P. Draw the projections of the pentagonal prism.

A right regular cylinder 50 mm diameter of base and 65 mm long lies on one of its generators, on the H.P. with its axis inclined at 30° to the V.P., cuts the cylinder and bisects its axis. Draw the apparent and true sections of the solid.

A right cylinder of 30 mm diameter and 35mm height of axis, inclined at 30° to H.P. and passes 18 mm from base along the axis. Draw the development of the truncated cylinder.

A square pyramid rests centrally over a cylindrical block. Draw the isometric projection of the arrangement. Consider the pyramid has a base with 25 mm side and 40 mm long axis whereas the cylindrical block has a base with 50 mm diameter and 20 mm thickness.

Write short notes on the following (any two):

i) Modify commands

ii) Building Information Modeling (BIM)

iii) Isometric and orthographic projection