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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. Which of the following motors CANNOT be run without a load?
Series-wound.
A wire wound resistor.
Ohms.
75 volts.

2. When should water be added to a battery?
Series-wound.
Resistance.
Ventilation.
After charging

3. The unit of measurement of resistance is?
Ohms.
100 ohms
Direct current.
746 watts.

4. In a parallel circuit...
Until the victim receives medical attention.
200 volts
Resistance.
A. Total resistance is less than the smallest resistor.

5. What voltage is required to force 5 amps through a 15-ohm resistor?
Soft iron.
Flush thoroughly with water.
75 volts.
Hydrogen.

6. How long should treatment for shock be continued?
4.8 ohms
48 volts
Resistance.
Until the victim receives medical attention.

7. Not a requirement of an explosion-proof enclosure?
Watts.
It must prevent internal explosions.
Attract each other.
No.4 AWG.

8. The unit of measurement of current is...
The movement of electrons in a circuit.
Amperes.
96 volts.
48 volts

9. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
500 volts.
No.4 AWG.
100 ohms
It must prevent internal explosions.

10. The explosive gas that is generated when a battery is charging is...
Hydrogen.
15 minutes.
A wire wound resistor.
Flush thoroughly with water.

11. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
In series.
8 ohms.
Power.
Repel each other.

12. What voltage would be required to force 10 amps through a 50-ohm resistor?
Hydrometer.
Hydrogen.
Current
500 volts.

13. What is the first step in treating a chemical burn of the eye?
Voltage.
Flush the burn the clean water.
Compound-wound and shunt-wound.
100 ohms

14. How many kilowatts are used to develop 50 horsepower?
Ventilation.
Resistance.
The movement of electrons in a circuit.
37.3 kilowatts

15. Resistance is measured with a...
Ohmmeter.
4.8 ohms
Hydrogen.
96 volts.

16. The longer the conductor - the greater the...
Ventilation.
The opposition to flow of electrons in a circuit.
Resistance.
Distance.

17. Not an electro-magnet?
746 watts.
In series.
A wire wound resistor.
Flush thoroughly with water.

18. What is the total voltage of eight 12-volt batteries connected in series?
No.4 AWG.
The movement of electrons in a circuit.
96 volts.
The opposition to flow of electrons in a circuit.

19. A triac is?
In series.
Voltmeter.
Amperes.
A bi-directional device that can pass current in either direction.

20. 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.
Soft iron.
Treat for physical shock.
4.8 ohms

21. Trailing cable on DC-powered mobile haulage equipment must be at least...
Compound-wound and shunt-wound.
A counter-EMF.
No.4 AWG.
Better speed control on motors.

22. How must two 12-volt batteries be connected in order to increase the current capacity?
Hydrogen.
It must prevent ignition of surrounding methane atmosphere.
In parallel.
75 volts.

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

24. The combined resistance of two resistors in parallel is...
Amperes.
Burns will appear only at the point where contact is made to the energized circuit.
Watts.
Less than the resistance of either resistor.

25. Storage battery charging stations must be provided with what kind of current protection?
Reverse.
Voltage.
It must prevent internal explosions.
Amperes.

26. Define direct current...
Current that flows in only one direction.
Series-wound.
Decrease.
1.260 to 1.280.

27. Define current...
In series.
100 ohms
Stays the same.
The movement of electrons in a circuit.

28. Which of the following motors are considered to be constant or nearly constant speed?
Compound-wound and shunt-wound.
Flush the burn the clean water.
Resistance.
Ohmmeter.

29. Which current flows in only one direction?
Direct current.
Repel each other.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Higher current with voltage remaining the same.

30. Voltage is measured with a...
Ohmmeter.
The opposition to flow of electrons in a circuit.
Voltmeter.
Decrease.

31. Define direct current...
Hydrogen.
Watts.
No.4 AWG.
Current that flows in one direction only.

32. What is the total voltage of four 9-volt batteries connected in a series?
36 volts.
75 volts.
A wire wound resistor.
400 ampere-hours.

33. The specific gravity of the electrolyte of a fully charged battery should be...
Amperes.
Less than the resistance of either resistor.
1.260 to 1.280.
Distance.

34. Current is measured with a (an)...
Ammeter.
75 volts.
400 ampere-hours.
37.3 kilowatts

35. Like poles of a magnet will...
Hydrogen.
Voltmeter.
15 minutes.
Repel each other.

36. The advantage of DC over AC is that DC offers...
Ohms.
Watts.
Better speed control on motors.
Clean water.

37. The instrument used to check the electrolyte of a battery is a...
Ohms.
Hydrometer.
It must prevent ignition of surrounding methane atmosphere.
Current.

38. Which of the following is a requirement of an explosion-proof enclosure?
Less than the resistance of either resistor.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Series-wound.
It must prevent ignition of surrounding methane atmosphere.

39. Chemical burns caused by battery acid should be washed with clean water for at least...
Repel each other.
Ohms.
Heat
15 minutes.

40. What voltage would be required to force 10 amps through a 20-ohm resistor?
Amperes.
200 volts
Soft iron.
Series-wound.

41. What should be used in treating an eye injury caused by battery acid?
Soft iron.
After charging
No.4 AWG.
Clean water.

42. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
Voltmeter.
Current
In series.
In parallel.

43. What is the total voltage of two 6-volt batteries connected in parallel?
1.260 to 1.280.
6 volts.
Distance.
15 minutes.

44. If the cross-sectional area of a conductor is increased - its resistance will...
Series-wound.
E=IR.
In series.
Decrease.

45. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
8 ohms.
1.260 to 1.280.
96 volts.
Power.

46. What is the rate that work is done or heat is dissipated?
6 volts.
Power.
Voltmeter.
Attract each other.

47. What is the total resistance of four 15-ohm resistors connected in series?
Burns will appear only at the point where contact is made to the energized circuit.
A bi-directional device that can pass current in either direction.
60 ohms.
Stays the same.

48. What is the total voltage of four 12-volt batteries connected in series?
96 volts.
400 ampere-hours.
Voltmeter.
48 volts

49. The armature of a direct current motor - when running - generates...
A counter-EMF.
The opposition to flow of electrons in a circuit.
The movement of electrons in a circuit.
No.4 AWG.

50. The best insulator against the lines of magnetic force is...
Distance.
75 volts.
746 watts.
200 volts

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DC Theory

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