Question

In order to facilitate the starting of locomotive in any position, the cranks of a locomotive, with two cylinders, are placed at ______________ to each other.

(a) 45°

(b) 90°

(c) 120°

(d) 180°

This question was addressed to me in a dream while sleeping

My question is based upon Primary and Secondary Unbalanced Forces of Reciprocating Masses in division Balancing of Reciprocating Masses of Machine Dynamics

Answer 1

Right choice is (b) 90°

Easy explanation: Due to the partial balancing of the reciprocating parts, there is an unbalanced primary force along the line of stroke and also an unbalanced primary force perpendicular to the line of stroke.