Certified Energy Manager Practice Exam

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What type of electric motors constitute the largest number installed in the USA?

Synchronous motors
Induction motors
DC motors
Stepper motors

The correct answer is: Induction motors

Induction motors account for the largest number of electric motors installed in the USA due to their widespread use in various applications, especially in industrial and commercial settings. They are favored for their reliability, simplicity, and robustness. Induction motors operate on the principle of electromagnetic induction and are typically more efficient for the vast range of functions they perform compared to other types of motors. They do not require brushes for operation, which reduces maintenance needs and increases their lifespan. This design aspect, combined with their cost-effectiveness, makes them the preferred choice for many applications, including fans, pumps, and conveyors. Additionally, the ability to easily scale and adapt the performance of induction motors for different load requirements enhances their popularity in various sectors. While synchronous motors, DC motors, and stepper motors are used in specific applications, such as precision tasks and control systems, their overall installation numbers are overshadowed by the predominance of induction motors in broad industrial and residential use. This is what solidifies induction motors as the largest segment of electric motors installed across the country.