Electrical Engineering XYZ MCQs
Which type of motor is preferred in lifts:
- DC Compound motors
- DC Series motors
- DC Shunt Motor
- None of the above
Correct answer: 2. DC Series motors
Explanation: The preferred type of motor for lifts is the DC Series motor. This type is chosen because it provides high starting torque, which is essential for moving the lift from a stationary position. Additionally, DC Series motors can handle varying load conditions, which is common in lift applications as the weight inside the lift can change frequently. These motors exhibit a speed-torque characteristic that suits the needs of lift operations — high torque at low speed when starting or stopping, and stable operation at designed speeds when in motion. Other motor types don’t match these specific requirements as efficiently as DC Series motors.