maximum torque it can transmit

number of cycles it undergoes before failure

elastic limit up to which it resists torsion, shear and bending stresses

torque required to produce a twist of one radian per unit length of shaft

from maximum at the center to zero at the circumference

from zero at the center to maximum at the circumference

from maximum at the center to mini-mum at the circumference

from minimum at the centre to maximum at the circumference

bearing stresses

fatigue stresses

crushing stresses

resultant stresses

increase key length

increase key depth

increase key width

double all the dimensions

maximum at periphery and zero at center

maximum at center

uniform throughout

none of the above.