Correct option is C
The
polygon effect occurs in
chain drives due to the way the chain engages and disengages with the sprocket teeth.
· In
chain drives, the chain wraps around the sprocket, but because it consists of
rigid links, it cannot form a perfect circle.
· Instead, the chain moves in a
polygonal shape, which causes
speed fluctuations and
vibrations.
· This effect becomes more noticeable at
higher speeds and when fewer sprocket teeth are used.
