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26307-11 Transformers

1. A three-phase, four-wire system that has the advantage of providing three-phase power and allowing lighting to be connected between any of the secondary phases and the neutral would have a(n) ________.

Question 1 of 25

2. When voltage is stepped down in a transformer, what happens to the current in the same circuit?

Question 2 of 25

3. What type of transformer provides 120V between the center -tapped terminal and each ungrounded terminal on either side and 240V across the full winding of each phase?

Question 3 of 25

4. What components are installed to increase the power factor and decrease the cost of electricity caused by large inductive loads?

Question 4 of 25

5. Other than surge capacitors or capacitors that are part of another apparatus, the chief use of capacitors is to ________.

Question 5 of 25

6. Which of the following refers to the condition in which two circuits share the energy of one of the circuits?

Question 6 of 25

7. Which of the following types of transformers must be installed in a vault?

Question 7 of 25

8. Most control transformers are ________.

Question 8 of 25

9. Which section of the NEC® contains transformer nameplate requirements?

Question 9 of 25

10. The installation of resistors and reactors is covered in ________.

Question 10 of 25

11. A lagging current for a motor or inductive device is represented by a power factor of ________.

Question 11 of 25

12. What type of transformer has more turns in the primary than the secondary?

Question 12 of 25

13. Capacitors are covered in ________.

Question 13 of 25

14. Which of the following best describes a transformer that increases the voltage on the primary from 120V to 1,200V?

Question 14 of 25

15. What forces are always present in an AC circuit?

Question 15 of 25

16. Refer to the figure above. Which taps should be connected to increase the secondary voltage by 5%?

Question 16 of 25

17. To improve the power factor of a circuit that has high inductive reactance, which of the following would be added to the circuit?

Question 17 of 25

18. To ensure maximum safety in a control transformer, the secondary control circuit is ________.

Question 18 of 25

19. Transformer cores support ________.

Question 19 of 25

20. Which of the following types of transformers can be ventilated, air-cooled, or sealed?

Question 20 of 25

21. Which winding of a transformer is connected to the load?

Question 21 of 25

22. Refer to the figure above. A multi-tap transformer has 1,620 turns in the primary. There are 40 turns between each tap. Taps 6 and 3 are connected. Which taps must be connected to reduce output voltage by 5%?

Question 22 of 25

23. The secondary voltage in a transformer can be increased or decreased by connecting various ________.

Question 23 of 25

24. The NEC® requires that conductors connected to the high leg of a four-wire delta system be color-coded with what color of insulation or tape?

Question 24 of 25

25. What is the voltage of the secondary in a transformer with 200 turns in the primary, 20 turns in the secondary, and an input voltage of 2,400V?

Question 25 of 25


 

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