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26201-11 Alternating Current

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

Question 1 of 35

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

Question 2 of 35

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

Question 3 of 35

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

Question 4 of 35

5. Inductive reactance increases as the ________.

Question 5 of 35

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

Question 6 of 35

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

Question 7 of 35

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

Question 8 of 35

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

Question 9 of 35

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

Question 10 of 35

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

Question 11 of 35

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

Question 12 of 35

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

Question 13 of 35

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

Question 14 of 35

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

Question 15 of 35

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

Question 16 of 35

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

Question 17 of 35

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

Question 18 of 35

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

Question 19 of 35

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

Question 20 of 35

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

Question 21 of 35

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

Question 22 of 35

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

Question 23 of 35

24. The formula for inductive reactance is ________.

Question 24 of 35

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

Question 25 of 35

26. When frequency decreases, capacitive reactance ________.

Question 26 of 35

27. The current in an inductive circuit ________.

Question 27 of 35

28. In AC circuits containing only resistance, ________.

Question 28 of 35

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

Question 29 of 35

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

Question 30 of 35

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

Question 31 of 35

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

Question 32 of 35

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

Question 33 of 35

34. 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 34 of 35

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

Question 35 of 35


 

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