+1 vote
in Machine Dynamics by (34.3k points)
The tractive force is maximum or minimum when the angle of inclination of the crank to the line of stroke ( θ ) is equal to

(a) 90° and 225°

(b) 135° and 180°

(c) 180° and 225°

(d) 135° and 315°

The question was asked in exam.

This interesting question is from Primary and Secondary Unbalanced Forces of Reciprocating Masses topic in portion Balancing of Reciprocating Masses of Machine Dynamics

1 Answer

0 votes
by (38.6k points)
Right answer is (d) 135° and 315°

To explain: The tractive force is maximum or minimum when (cos θ – sin θ ) is maximum or minimum. For (cos θ – sin θ ) to be maximum or minimum,

∴ tanθ = −1 or θ =135° or 315°

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