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26201-11 Alternating Current

1. The self-induced voltage across an inductance is equal to the change in ________.

Question 1 of 35

2. When frequency decreases, capacitive reactance ________.

Question 2 of 35

3. Given: A 30-microfarad capacitor in parallel with a 15-microfarad capacitor. The total capacitance is ________.

Question 3 of 35

4. If the area of the plates of a capacitor is increased, the amount of capacitance ________.

Question 4 of 35

5. Maximum voltage is generated by rotating wire when the conductor is moving ________.

Question 5 of 35

6. Given: An AC circuit containing resistance only. What is the current flow if the resistance is 15 ohms and the voltage is 150V?

Question 6 of 35

7. Each of three equal capacitors in series has ________.

Question 7 of 35

8. Given: A transformer has 200 turns in the primary, 100 turns in the secondary, and 150VAC applied to the primary. What is the voltage across the secondary?

Question 8 of 35

9. In a circuit that has both capacitance and resistance, the current will lead the voltage ________.

Question 9 of 35

10. The product of the source voltage and the total current is ________.

Question 10 of 35

11. In an inductive AC circuit, when the applied voltage is at its maximum negative value, the current is ________.

Question 11 of 35

12. In a parallel LC circuit, the voltage across the branches is ________.

Question 12 of 35

13. The current in an inductive circuit ________.

Question 13 of 35

14. Which of the following is true of the current in a capacitive circuit?

Question 14 of 35

15. What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary?

Question 15 of 35

16. A circuit has a peak voltage of 275V. What is the average voltage value?

Question 16 of 35

17. Which of the following uses electromagnetic induction to transfer electrical energy from one circuit to another?

Question 17 of 35

18. Transformers in which the primary and secondary voltages are 180 out of phase are known as ________.

Question 18 of 35

19. "ELI the ICE Man" is used to remember ________.

Question 19 of 35

20. The power factor can be defined as the ratio of true power to ________.

Question 20 of 35

21. In AC circuits containing only resistance, ________.

Question 21 of 35

22. Given: A circuit has an rms voltage of 120VAC. What is the peak-to-peak voltage?

Question 22 of 35

23. In sine wave terminology, the average value is ________.

Question 23 of 35

24. If the phase angles of two sine waves are both 00, then the waves ________.

Question 24 of 35

25. According to the power triangle, the apparent power is ________.

Question 25 of 35

26. What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second?

Question 26 of 35

27. If the vector diagram of two AC waveforms is a right angle, then the waves ________.

Question 27 of 35

28. Calculate the true power in a 2A series RL circuit with a 100Ω resistor.

Question 28 of 35

29. Opening the secondary of a CT under load will cause a dangerous level of ________.

Question 29 of 35

30. For a given frequency, the capacitive reactance decreases with ________.

Question 30 of 35

31. Unless otherwise noted, the calculations in AC circuits use ________.

Question 31 of 35

32. The formula for inductive reactance is ________.

Question 32 of 35

33. If the time for one cycle is 0.1 second, the frequency is ________.

Question 33 of 35

34. Which of the following opposes any change in circuit current?

Question 34 of 35

35. Inductive reactance increases as the ________.

Question 35 of 35


 

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