NEIEP Mechanics Practice Exam

Which motor type is known for its simplicity and reliability in variable speed applications?

1. Induction Motor

2. Universal Motor

3. Gear Motor

4. Capacitor Start Motor

The correct answer is: Universal Motor

The universal motor is recognized for its simplicity and reliability, particularly in variable speed applications. This type of motor can operate on both alternating current (AC) and direct current (DC), which makes it versatile for various applications. Its design is straightforward, typically featuring a series winding that provides essential torque, allowing for easy control of speed by adjusting the input voltage. This simplicity in design translates to fewer components that can fail, enhancing its reliability. Additionally, universal motors can achieve a wide range of speeds, making them well-suited for tasks like portable tools and household appliances where variable speed is beneficial. While other motors like the induction motor are widely used, they primarily excel in fixed-speed applications due to their construction and operational characteristics. Gear motors and capacitor start motors serve specific purposes as well; gear motors are focused on providing high torque through gearing, and capacitor start motors are designed for high starting torque but are not as adaptable in speed variations as the universal motor.