Discussion
The groove angle of the pulley for V-belt drive is usually:
Answer: C
The groove angle is usually 32° - 38°.
A V-belt pulley groove is made with an included angle of about 30 to 40 degrees, commonly specified between 32 and 38 degrees. The belt wedges into the groove, which increases the normal reaction and so the friction it can transmit.
Angles of 20 to 32 degrees would make the belt jam in the groove, and 38 to 45 degrees would lose the wedging action that gives a V-belt its grip.
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