Theory of Machine
The two elements of a pair are said to form a higher pair, when they

Permit relative motion
Are kept in contact by the action of external forces, when in motion
Have a line or point contact when in motion
Have a surface contact when in motion

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will

Become equal to R/4
Become equal to 2R
Remain same as before
Become equal to R/2

ANSWER DOWNLOAD EXAMIANS APP