ED VIVA QUESTIONS
Q: What is the formula for finding the angle of a regular polygon?
A: 180-360/n n is number of sides.
Q: What is a reducing scale?
A:
Q: What is the difference between first angle and third angle systems?
A: Front View and Top view positions are exchanged.
1st angle FV above XY line.
Q: What is a vertical/horizontal trace?
Q.Give the symbol for 1st angle projection system?
A: Make a frustum of cone. On left side FV (trapezium) and on right side Top view
(two circles)
Q.Why 2nd and 4th angle systems cannot be used ?
A:FV n TV r on same side of XY line n may also overlap for both 2nd (above XY) n
4th angle (Below XY) projection.
a
p
s
n
i
.
ce
Q.Difference between isometric and orthographic projection ?
A: In Isometric projection we can see 3 faces of the objects (talking in respect to
cube >> as we use box method for drawing) at the same time in 1 projection
But in Orthographic projection only 1 view is visible in 1 projection i.e. TV or FV or
LHV.
l
o
.c
e
g
le
Q.Draw the orthographic projections of a pentagonal pyramid with one
triangular face parallel to the VP?
A.
w
w
Q. Draw the development of a right circular cone?
A. Draw an arc with a angle=360*radius of base circle/slant height of cone.
w