Comprehensive Guide to Transformer Mechanics

Understanding Electrical Machines and Transformers — Lesson 1

Understanding Practical Transformers and Phasor Diagrams — Lesson 2

Understanding Practical Transformers and Their Models — Lesson 3

Understanding Eddy Current Loss in Transformers — Lesson 4

Understanding Eddy Current and Hysteresis Loss — Lesson 5

Understanding Hysteresis Loss in Magnetic Materials — Lesson 6

Understanding Electrical Machines: Core Losses — Lesson 7

Understanding Equivalent Circuit of Transformers-1 — Lesson 8

Understanding Equivalent Circuits of Transformers-2 — Lesson 9

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Question 1 of 10

1. Question
What is the primary current in transformers with two secondaries calculated using?
- Reflected components in currents
- Power balance in AC circuits
- Bolt pattern
- None of the above
Question 2 of 10

2. Question
What does the power balance in AC circuits simplify? (Select the 2 correct answers)
- Calculation of currents in transformers
- Calculation of voltages in transformers
- Calculation of resistances in transformers
- Calculation of impedances in transformers
Question 3 of 10

3. Question
What is the main difference between a practical and an ideal transformer?
- The number of turns
- The size of the transformer
- The presence of winding resistances and magnetizing current
- The type of material used
Question 4 of 10

4. Question
What does the phasor diagram of a transformer represent?
- The operation of the transformer
- The size of the transformer
- The number of turns in the transformer
- The type of material used in the transformer
Question 5 of 10

5. Question
What factors are considered when drawing the phasor diagram of a transformer? (Select the 2 correct answers)
- The magnetizing current
- The winding resistances
- The size of the transformer
- The number of turns in the transformer
Question 6 of 10

6. Question
What does the leakage flux in a transformer cause?
- Extra voltage drop
- Increase in mutual flux
- Decrease in winding resistance
- Increase in magnetizing current
Question 7 of 10

7. Question
How can Eddy current loss be reduced in transformers?
- By increasing the resistance
- By using solid iron in the transformer core
- By using thin, insulated plates instead of solid iron
- By increasing the magnetizing current
Question 8 of 10

8. Question
What factors does eddy current loss depend on? (Select the 3 correct answers)
- The maximum value of the flux density
- The supply frequency
- The thickness of the plate
- The resistivity of the material
Question 9 of 10

9. Question
What does the area enclosed by the BH loop represent?
- The energy supplied to the coil.
- The energy returned to the source.
- The hysteresis loss per unit volume.
- The total energy in the magnetic circuit.
Question 10 of 10

10. Question
What does the short circuit test help to calculate?
- Core loss resistance
- Magnetizing reactance
- Winding resistance
- Leakage reactance