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DC Theory

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What should be used in treating an eye injury caused by battery acid?
746 watts.
Repel each other.
Clean water.
Amperes.

2. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
6 volts.
After charging
Stays the same.
4.8 ohms

3. Current in a series circuit...
Clean water.
Hydrogen.
60 ohms.
Stays the same.

4. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
400 ampere-hours.
8 ohms.
746 watts.
Amperes.

5. The unit of measurement of power is...
Watts.
Hydrometer.
In series.
Voltage.

6. How many kilowatts are used to develop 50 horsepower?
Series-wound.
15 minutes.
37.3 kilowatts
In series.

7. The first step in treating a chemical burn - such as one caused by battery acid - is to...
Flush thoroughly with water.
No.4 AWG.
A. Total resistance is less than the smallest resistor.
200 volts

8. Which of the following motors CANNOT be run without a load?
The opposition to flow of electrons in a circuit.
In series.
Flush thoroughly with water.
Series-wound.

9. What is the total resistance of four 25-ohm resistors connected in series?
100 ohms
60 ohms.
After charging
Distance.

10. Resistance is measured with a...
Series-wound.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Ohmmeter.
Current

11. Define direct current...
200 volts
Hydrogen.
It must prevent ignition of surrounding methane atmosphere.
Current that flows in one direction only.

12. When should water be added to a battery?
After charging
Better speed control on motors.
48 ohms.
Compound-wound and shunt-wound.

13. What is the flow of electrons in a conductor?
Hydrogen.
Distance.
The movement of electrons in a circuit.
Current.

14. Which current flows in only one direction?
In series.
Stays the same.
It must prevent internal explosions.
Direct current.

15. The unit of measurement of resistance is?
Ohms.
E=IR.
Current that flows in one direction only.
The opposition to flow of electrons in a circuit.

16. Batteries connected in parallel provide...
In parallel.
36 volts.
Wattmeter.
Higher current with voltage remaining the same.

17. Not an electro-magnet?
A wire wound resistor.
Hydrogen.
Until the victim receives medical attention.
Hydrogen.

18. What is the total resistance of four 15-ohm resistors connected in series?
Reverse.
Decrease.
60 ohms.
75 volts.

19. Not a requirement of an explosion-proof enclosure?
6 volts.
It must prevent internal explosions.
100 ohms
There is a hazard of blowing the contents back into your face - 'explosive reaction'.

20. Define direct current...
Current that flows in only one direction.
48 ohms.
In series.
Flush thoroughly with water.

21. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...
Hydrogen.
400 ampere-hours.
4.0 ohms.
Resistance.

22. Power is measured with a...
Ventilation.
48 volts
Direct current.
Wattmeter.

23. The combined resistance of two resistors in parallel is...
Hydrometer.
After charging
Less than the resistance of either resistor.
36 volts.

24. What is the total resistance of three 16-ohm resistors connected in series?
48 ohms.
Less than the resistance of either resistor.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
6 volts.

25. The most common reason that solid state devices fail is...
Heat
Resistance.
Distance.
Burns will appear only at the point where contact is made to the energized circuit.

26. What is the opposition to flow of electric current?
60 ohms.
Flush the burn the clean water.
Resistance.
Compound-wound and shunt-wound.

27. What is the total voltage of eight 12-volt batteries connected in series?
48 volts
96 volts.
Flush thoroughly with water.
The movement of electrons in a circuit.

28. The longer the conductor - the greater the...
75 volts.
A bi-directional device that can pass current in either direction.
Resistance.
In parallel.

29. What is the rate that work is done or heat is dissipated?
Power.
Until the victim receives medical attention.
Compound-wound and shunt-wound.
Hydrogen.

30. How must two 12-volt batteries be connected in order to increase the current capacity?
37.3 kilowatts
Less than the resistance of either resistor.
In parallel.
The opposition to flow of electrons in a circuit.

31. Chemical burns caused by battery acid should be washed with clean water for at least...
In parallel.
15 minutes.
Reverse.
Series-wound.

32. The advantage of DC over AC is that DC offers...
37.3 kilowatts
60 ohms.
Better speed control on motors.
Ammeter.

33. What is the total voltage of two 6-volt batteries connected in parallel?
37.3 kilowatts
Current.
6 volts.
Soft iron.

34. Which of the following is a requirement of an explosion-proof enclosure?
Better speed control on motors.
It must prevent ignition of surrounding methane atmosphere.
4.0 ohms.
Reverse.

35. Voltage in a parallel circuit...
1.260 to 1.280.
Heat
4.0 ohms.
Stays the same.

36. What is the unit of electromotive force or electric pressure?
48 volts
Voltage.
200 volts
Stays the same.

37. Like poles of a magnet will...
Repel each other.
Better speed control on motors.
Resistance.
Hydrogen.

38. The best insulator against the lines of magnetic force is...
Until the victim receives medical attention.
Distance.
Attract each other.
It must prevent ignition of surrounding methane atmosphere.

39. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
E=IR.
Stays the same.
Higher current with voltage remaining the same.
In series.

40. What is the first step in treating a chemical burn of the eye?
Amperes.
Flush the burn the clean water.
Resistance.
Higher current with voltage remaining the same.

41. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
In series.
Treat for physical shock.
48 volts
37.3 kilowatts

42. Current is measured with a (an)...
Current that flows in only one direction.
Ammeter.
Current.
A counter-EMF.

43. Which of the following stays the same in all parts of a series circuit?
Current
Attract each other.
Decrease.
4.8 ohms

44. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
500 volts.
Less than the resistance of either resistor.
Hydrogen.
6 volts.

45. How long should treatment for shock be continued?
Burns will appear only at the point where contact is made to the energized circuit.
Until the victim receives medical attention.
75 volts.
Heat

46. How many watts are in one horsepower?
After charging
Current that flows in only one direction.
746 watts.
48 volts

47. What voltage would be required to force 10 amps through a 50-ohm resistor?
The movement of electrons in a circuit.
Resistance.
500 volts.
Current.

48. Define current...
Heat
Decrease.
The movement of electrons in a circuit.
Better speed control on motors.

49. If the victim of an electrical shock has been burned while in contact with electricity - the first treatment you should apply - if the victim's heart and respiratory system are still functioning - is to...
The opposition to flow of electrons in a circuit.
A counter-EMF.
Distance.
Treat for physical shock.

50. What is Ohm's Law?
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
8 ohms.
E=IR.
746 watts.

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DC Theory

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