+1 vote
in Machine Dynamics by (34.3k points)
The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

(a) 0°

(b) 90°

(c) 180°

(d) 360°

The question was asked in final exam.

The origin of the question is Primary and Secondary Unbalanced Forces of Reciprocating Masses topic in section Balancing of Reciprocating Masses of Machine Dynamics

1 Answer

0 votes
by (38.6k points)
The correct choice is (c) 180°

Easy explanation: The primary unbalanced force is maximum, when θ = 0° or 180°. Thus, the primary force is maximum twice in one revolution of the crank. The maximum primary unbalanced force is given by

                FP(max) = m⋅ω^2⋅r

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