shafts are arranged parallel and rotate in the opposite directions

shafts are arranged parallel and rotate in the same directions

shafts are arranged at right angles and rotate in one definite direction

none of the above

feather key

gib-head key

wood ruff key

flat saddle key

10 Degree-20 Degree

30 Degree-40 Degree

40 Degree-60 Degree

60 Degree-80 Degree

brittle materials

ductile materials

brittle as well as ductile materials

elastic materials

zero at the centroidal axis

zero at the point other than centroidal axis

maximum at the neutral axis

none of these