NCCER Millwright Practice Exam

Maintaining the performance of seals is crucial for the efficient operation of machinery and equipment. All three factors listed play significant roles in ensuring that seals function effectively.

Temperature fluctuations can affect the material properties of seals, leading to expansion or contraction, which may result in leakage or reduced sealing effectiveness. Seals are often designed to operate within specific temperature ranges, and frequent or extreme fluctuations can compromise their integrity.

Vibration levels are another critical factor. Excessive vibration can cause mechanical wear and tear on the seals, leading to premature failure. It can also displace seals from their intended positions, again risking seal effectiveness and potential leaks.

Lubrication quality is also essential. Proper lubrication reduces friction and wear on the seals, extending their lifespan and ensuring effective sealing. Poor lubrication can lead to increased wear, overheating, and ultimately seal failure.

Thus, considering that all these factors—temperature fluctuations, vibration levels, and lubrication quality—are interconnected and vital for optimal seal performance, the correct answer encompasses the importance of all these aspects.