AC Theory
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AC Theory
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25 Questions

1. What is the first step to be followed in aiding a victim of electrical shock?

2. How should clothing be removed from a burn?

3. When connecting 3 single-phase transformers into a three-phase system - which of the following is NOT required for the single-phase transformers.

4. Current in an AC circuit may be measured by...

5. AC voltage is raised or lowered by means of...

6. A transformer has a primary voltage of 2 -800 volts and a secondary reading of 140 volts. If there are 2000 turns on the primary - how many turns are on the secondary?

7. The following motor leads are brought out of a 3-phase motor (T1 - T2 - T3 - T4 - T5 - T6). This motor is probably for...

8. A 3-phase - 2 speed - constant torque motor is running at fast speed. The motor windings are connected wye for fast speed. Motor leads T4 - T5 and T6 are connected to the line leads. Motor leads T1 - T2 and T3 should be...

9. If any two-phase wires are reversed on a three-phase motor - the motor will...

10. A transformer has 1 -600 turns in the primary and 400 turns in the secondary. The primary voltage is 2 -400 volts. What is the secondary voltage?

11. What value of voltage will be measured from phase-to-phase - in a wye-connected secondary - if 2 -300 volts is measured from phase-to-ground?

12. A control power transformer...

13. Compared to the secondary of a loaded - step-down transformer - the primary has...

14. The transformer used only to measure voltage is a...

15. A burn causing a blister is classified as a...

16. A transformer has 2000 turns in the primary and 500 turns in the secondary. The primary voltage is 3 -200 volts. What is the secondary voltage?

17. A transformer has a primary voltage of 2 -400 volts and a secondary reading of 120 volts. If there are 1 -500 turns on the primary - how many turns are on the secondary?

18. Two 10-hp induction motors are operating on 460 volts AC. One motor is connected by single- phase; the other is connected in three-phase. The three-phase will...

19. The primary function of a power transformer is to provide...

20. When not connected to a load - the secondary leads of a current transformer should be...

21. The current on the primary side of a step-down transformer with a 4:1 ratio will be...

22. Under fault conditions - the grounding resistor in a high voltage circuit limits the voltage drop in the grounding circuit external to the resistor to not more than...

23. Which of the following does a squirrel cage induction motor have?

24. Using a 10:1 ratio transformer - the terminals on the secondary side or lower voltage side would be marked...

25. The size of a transformer is measured in...

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