Question

Secondary forces in reciprocating mass on engine frame are

(a) of same frequency as of primary forces

(b) twice the frequency as of primary forces

(c) four times the frequency as of primary forces

(d) none of the mentioned

I got this question by my college professor while I was bunking the class.

Origin of the question is Balancing of Several Masses Rotating in Different Planes in section Balancing of Rotating Masses of Machine Dynamics

Answer 1

Correct answer is (b) twice the frequency as of primary forces

For explanation: None.