The "soft" insulation of practically all electrical machinery uses asphalt binders which reduces the potentially harmful effects of vibration. What property associated with this type of insulation must be kept in mind?
• Soft asphalt insulation and how it behaves over time on electrical machinery • Effects of heat and vibration on asphalt-based materials • How moisture and mechanical stress typically affect insulation
• Think about what happens to asphalt or tar-like materials when they are exposed to long-term heating and cooling cycles plus vibration. • Ask yourself which option best describes a potential problem or limitation of asphalt-type materials used as binders. • Consider whether asphalt-based materials are more known for their moisture behavior or their mechanical/structural behavior under stress.
• Decide whether asphalt-based insulation is more likely to protect against moisture or to react badly to mechanical stress/aging. • Focus on which choice reflects a disadvantage or precaution rather than a benefit. • Eliminate any option that describes a property not typically associated with asphalt-based binders in electrical insulation.
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