Theory of Machine
The main disadvantage of the sliding pair is that it is

Wears rapidly
Difficult to manufacture
Bulky
Both (A) and (B) above

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

ANSWER DOWNLOAD EXAMIANS APP