Subtopic: Design and selection of machine elements – gears, pulleys, chains and sprockets and belts
Question Statement:
The phenomenon of chordal action (polygonal effect) in roller chain drives results from:
Options:
(A) The pitch line of the chain riding along straight chordal links rather than a perfect circle on the sprocket
(B) Wear of the roller pins under heavy dynamic loads
(C) Excessive lubricant viscosity
(D) Misalignment of drive shafts
Answer Key:
A
Step-by-Step Solution & Explanation
Chordal action causes cyclic fluctuations in linear chain speed and angular velocity of the driven sprocket due to the polygonal geometry of the sprocket teeth.