Which factor is NOT required for calculating driven shaft speed in a belt drive system?

Study for the PMMI Mechanical Test. Prepare with multiple choice questions, with hints and explanations. Ace your exam with confidence!

In a belt drive system, calculating the driven shaft speed primarily depends on the driver shaft speed, the size of the sheaves (pulleys), and the pitch or pulley ratio. The driver shaft speed is the rotational speed of the input shaft, while the size of the sheaves refers to their diameter, which influences how speed is transferred from the driver to the driven shaft. The pitch or pulley ratio is critical as it quantifies the relationship between the diameters of the driver and driven sheaves, dictating how speeds are adjusted between the two shafts.

In this context, pitch length does not directly influence the calculation of the driven shaft speed. Pitch length of the belt may inform aspects like tension or wear, but it does not play a fundamental role in the speed equation derived from the other mentioned factors. Thus, it is not a requirement for determining the driven shaft speed in the context of a belt drive system.

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