# GATE Questions & Answers of Balancing of Reciprocating and Rotating Masses

## What is Balancing of Reciprocating and Rotating Masses ?

Whenever the masses reciprocates or rotates it generates unbalanced forces (due to inertia force) which may induce unwanted vibrations. Balancing is the process of designing and modifying mass / linkages so that the unbalance force is reduced to an acceptable level and if possible eliminate entirely.

## What is the Weightage of Balancing of Reciprocating and Rotating Masses in GATE Exam?

Total 1 Questions have been asked from Balancing of Reciprocating and Rotating Masses topic of Theory of Machines subject in previous GATE papers. Average marks 2.00.

Two masses m are attached to opposite sides of a rigid rotating shaft in the vertical plane. Another pair of equal masses m1 is attached to the opposite sides of the shaft in the vertical plane as shown in figure. Consider m = 1 kg, e = 50 mm, e1 = 20 mm, b = 0.3 m, a = 2 m and a1 = 2.5 m. For the system to be dynamically balanced, m1 should be ________ kg.