Which of the following describes a consequence of mismatched frequencies in switchgear?

Mismatched frequencies in switchgear can lead to equipment failures due to the fact that most electrical systems and components are designed to operate within specific frequency ranges for optimal performance. When the frequency deviates from the designated range, it can cause various issues, such as overheating, excessive vibrations, and improper functioning of protective devices. These failures can manifest in damage to electrical components, such as breakers, transformers, or control circuitry, ultimately compromising the reliability and safety of the entire electrical system.

The other options do not align with the consequences of mismatched frequencies. For instance, improved energy efficiency, enhanced operational speed, and increased equipment lifespan would typically be associated with well-matched systems that are properly configured and maintained. In contrast, mismatched frequencies lead to negative outcomes, highlighting the importance of maintaining proper frequency alignment in switchgear operations.