Question

what is the belt drive ratio?
driven sheave diameter divided by driver sheave diameter
driven sheave pitch diameter divided by the driver sheave pitch diameter
belt length divided by the belt thickness
belt circumference divided by the belt diameter
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Explanation:

The belt drive ratio is calculated using the pitch diameters of the sheaves. The pitch diameter is the effective diameter for power transmission. Dividing the driven sheave pitch diameter by the driver sheave pitch diameter gives the correct ratio. The first option uses regular diameter (not pitch - which is incorrect). The third option (belt length / belt thickness) and the fourth option (belt circumference / belt diameter) are not relevant to the drive ratio concept.

Answer:

Driven sheave pitch diameter divided by the driver sheave pitch diameter