Reference no: EM13867963
1. Describe the similarities and differences between the three different types of polyphase AC motors.
2. Describe five (5) benefits of using a 3-phase motor compared to a single-phase motor.
3. Sketch the torque speed curve of an induction motor and identify the following points on the graph:
- Breakaway starting Torque
- Pull-up Torque
- Pull-out Torque
- Full load Torque
4. What are the three (3) main components of a DC motor? Explain each component.
5. What are the main losses in an induction motor (name and briefly explain) and how the efficiency is calculated?
6. List and explain the seven (7) parameters that must be monitored to ensure the motor is in good condition.
7. List and explain the four (4) parameters that must be monitored to ensure motor bearings are in good condition.
8. List and explain the parameters that can cause insulation failure in an electric motor.
9. What are the six (6) features of ideal motor protection relays?
10. What are the four (4) main areas of a typical VSD control system?
11. List and explain the mechanical failures and auxiliary failures in an electric motor.
12. What are the three (3) common cabling errors made when installing VSD's?