9) When the section plane is inclined to the axis and is parallel to one of the generators the section is a .........
a) Ellipse
b) Parabola
c) Hyperbola
d) Cycloid
10) Use of elliptical curve is........
a) Arches
b) Dams and monuments
c) Manholes, gland & stuffing boxes
d) All of these
11) Use of parabolic curve is.........
a) Bridges & arches
b) Sound reflectors
c) Light reflectors
d) All of these
12) Use of hyperbolical curve is......
a) Cooling towers and water channel
b) Dames
c) Bridges
d) All of these