NCCER Millwright Practice Exam

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Friction in machinery primarily occurs between what two components?

  1. Shaft and bearing

  2. Coupling and motor

  3. Gear and load

  4. Seal and casing

The correct answer is: Shaft and bearing

Friction in machinery primarily occurs between the shaft and bearing because these two components are in direct contact as the shaft rotates. The bearing serves to support the rotating shaft and provide a smooth surface for it to turn against. The interaction between these two components leads to friction, which can cause wear and may generate heat if not properly lubricated. Understanding the role of bearings is crucial for millwrights as they must ensure that these components are correctly installed and maintained to minimize friction and prolong the life of the machinery. In contrast, while couplings, gears, and seals can experience friction, they typically do so in ways that are secondary to the direct interaction between shafts and bearings, which are the primary areas of concern for friction.

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