Final answer:
To reduce vibration and wear of c belts, the use of matched belts in combination with good quality balanced sheaves is essential. The balanced sheaves reduce imbalance and the associated vibrations, improving the lifespan of the belts and machinery.
Step-by-step explanation:
To minimize vibration and premature wearing of Adam's c belts, use matched belts and: A) good quality balanced sheaves. The use of matched belts ensures uniformity in tension and length, leading to even distribution of load and reduced vibrations. Good quality balanced sheaves are critical because they guarantee the sheaves are free from manufacturing defects that can cause imbalance and hence vibrations. This not only helps in reducing wear but also extends the lifespan of the belts and associated machinery components.
Using a fluid drive (B), a variable speed motor (C), or a belt guard (D) does not directly contribute to minimizing belt vibration or premature wear in the same primary aspect as good quality sheaves. A fluid drive can reduce shock loads, a variable speed motor can adjust speeds as needed, and a belt guard is primarily for safety, rather than for balancing rotational elements.