NCCER Millwright Practice Exam

Question: 1 / 400

What does "dynamic balance" refer to in machinery?

The process of balancing stationary machinery

The smooth rotation of a shaft without vibration under operating conditions

Dynamic balance in machinery specifically refers to the condition where a component, typically a rotating shaft or rotor, spins smoothly and without vibration when in operation. This concept is crucial in various mechanical systems, as vibrations can lead to wear, damage, and efficiency loss. Achieving dynamic balance means that the mass distribution around the rotational axis is even, ensuring that forces produced during rotation do not create excessive vibrations.

In practical terms, this involves the correct positioning of weights on the rotor and validating that the centrifugal forces associated with rotation are uniformly managed. When dynamic balance is achieved, machinery operates more effectively and can enhance the longevity of components by minimizing stress and vibration-related issues. This is particularly important in high-speed applications where small imbalances can lead to significant problems.

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The balancing of electrical loads in a system

The alignment of gears in a mechanical system

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