Machine Design
The shock absorbing capacity of a bolt can be increased by

Grinding the shank
Increasing shank diameter
Making shank diameter equal to core diameter of thread
Tightening it properly

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
A woodruff key is

A tapered key with head at one end
Fitted in pairs at right angles
All of these
Capable of tilting in a recess milled out in the shaft

ANSWER DOWNLOAD EXAMIANS APP