Question

Tractive force attains a maxima or minima when the crank angle is 90 degrees.

(a) True

(b) False

This question was addressed to me during an internship interview.

My question is based upon Variation of Tractive Force in division Balancing of Reciprocating Masses of Machine Dynamics

Answer 1

Right option is (b) False

The best I can explain: The tractive force is maximum or minimum when the expression (cos θ – sin θ ) is maximum or minimum, differentiating it with respect to theta gives tan θ = -1

hence maximum/minimum value occurs at 135 or 315 degrees.