Question

The swaying couple is due to the

(a) primary unbalanced force

(b) secondary unbalanced force

(c) two cylinders of locomotive

(d) partial balancing

I got this question during an interview.

I want to ask this question from Primary and Secondary Unbalanced Forces of Reciprocating Masses topic in portion Balancing of Reciprocating Masses of Machine Dynamics

Answer 1

Correct choice is (a) primary unbalanced force

The best I can explain: The unbalanced forces along the line of stroke for the two cylinders constitute a couple. This couple has swaying effect about a vertical axis, and tends to sway the engine alternately in clockwise and anticlockwise directions. Hence the couple is known as swaying couple.