INE 2020 - Motors and Transformers

A. Introduction to electricity

1. Explain static & current electricity as the movement of electrons.

2. Calculate power in watts, using Power law.

3. Convert watts to horsepower.

4. Size conductors properly.

B. AC power generation

1. Explain how motion and magnetism can be made to generate an alternating voltage and current.

2. Describe a sine wave and explain how it is generated.

3. Describe how a transformer makes AC power transmission and distribution possible.

4. Calculate secondary voltage in a transformer.

5.Explain 3-phase AC.

6.Describe an Edison 3-way wire system and explain why it is used.

7.Explain the difference between neutral conductors and grounding wire.

C. Circuits, coils, and capacitors

1. Determine the equivalent resistance of combination circuits.

2. Describe the relationship between current, voltage, and impedance in circuits containing capacitors and inductors.

3. Explain why current times voltage does not equal power in capacitive or inductive circuits.

D. Three phase power circuits

1. Recognize the type of AC power available.

2. Describe the various Wye and Delta 3-phase configurations.

3. Calculate transformer voltage and current for the various 3-phase configurations.

4. Connect single and 3-phase transformers and loads.

E. Reading electrical diagrams

1. Identify the components on schematic diagrams and explain what they do.

2. Explain the operation of typical motor control circuits.

3. Find the different parts or elements of components on relay ladder logic schematic diagrams.

4. Determine the sequence of machine operation from a relay ladder logic diagram.

F. Electrical troubleshooting

1. Explain the functional sections of an electrical system.

2. Use the symptoms of failure to figure out the probable causes of failure.

3. Test to eliminate the possibilities systematically.

4. Determine why a component or system failed.

5.Use meters correctly.

6.Work safely around energized equipment.

G. Maintaining and troubleshooting electric motors

1. Describe how an electric motor operates.

2. Describe the basic construction of an electric motor.

3. Define work, horsepower, torque, RPM, and motor efficiency.

4.Explain how an electric motor performs under load conditions.

5.Explain how a motor can overheat.

6.Explain how DC motor speed and direction are controlled.

7.Demonstrate how AC motors are reversed, and how their speed is controlled.

8.Explain motor nameplate data.

9.Install and connect a motor properly.

10.Determine the probable causes of motor malfunctions from the symptoms.