DC Theory
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Avg score: 39% • Most missed: “What is the total resistance of three 16-ohm resistors connected in series?”
DC Theory
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25 Questions

1. What voltage would be required to force 10 amps through a 50-ohm resistor?

2. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?

3. The best insulator against the lines of magnetic force is...

4. The advantage of DC over AC is that DC offers...

5. What is the total voltage of two 6-volt batteries connected in parallel?

6. Not an electro-magnet?

7. The specific gravity of the electrolyte of a fully charged battery should be...

8. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...

9. Define resistance...

10. Which of the following is a requirement of an explosion-proof enclosure?

11. When should water be added to a battery?

12. Which current flows in only one direction?

13. In a parallel circuit...

14. The combined resistance of two resistors in parallel is...

15. Batteries connected in parallel provide...

16. How many kilowatts are used to develop 50 horsepower?

17. What is the equivalent resistance of two 8-ohm resistors connected in parallel?

18. Voltage is measured with a...

19. The unit of measurement of current is...

20. Trailing cable on DC-powered mobile haulage equipment must be at least...

21. The unit of measurement of power is...

22. Power is measured with a...

23. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...

24. Not a requirement of an explosion-proof enclosure?

25. What is the opposition to flow of electric current?

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