Red Seal Plumbing Practice Exam

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To achieve different speeds, a belt drive furnace motor requires what adjustment to the pulley?

Decrease diameter
Increase width
Increase diameter
Maintain same size

The correct answer is: Increase diameter

When considering a belt drive furnace motor, adjusting the diameter, or size, of the pulley is necessary in order to achieve different speeds. Option A, decreasing the diameter of the pulley, would actually result in a slower speed due to the reduced amount of surface area the belt is able to grip. Option B, increasing the width of the pulley, would not affect the speed of the motor as it only impacts the amount of power that can be transmitted. Option D, maintaining the same size of the pulley, would also not allow for different speeds as the motor would continue to operate at its maximum capacity. Therefore, the only correct option is C - increasing the diameter of the pulley.