Theory of Machine
The example of spherical pair is

Ball bearing and roller bearing
Lead screw of a lathe
Bolt and nut
Ball and socket joint

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
Hammer blow

Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies as the square root of the speed
Varies inversely with the square of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.

ANSWER DOWNLOAD EXAMIANS APP