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DC Theory

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. Define current...
A wire wound resistor.
The movement of electrons in a circuit.
Series-wound.
Compound-wound and shunt-wound.

2. Not true about electrical shocks?
37.3 kilowatts
Until the victim receives medical attention.
36 volts.
Burns will appear only at the point where contact is made to the energized circuit.

3. The explosive gas that is generated when a battery is charging is...
After charging
37.3 kilowatts
Hydrogen.
Flush the burn the clean water.

4. What is the first step in treating a chemical burn of the eye?
Flush the burn the clean water.
Ammeter.
Hydrometer.
A. Total resistance is less than the smallest resistor.

5. Chemical burns caused by battery acid should be washed with clean water for at least...
Decrease.
400 ampere-hours.
Resistance.
15 minutes.

6. Define resistance...
Distance.
The opposition to flow of electrons in a circuit.
Power.
500 volts.

7. If the cross-sectional area of a conductor is increased - its resistance will...
A bi-directional device that can pass current in either direction.
Current.
In parallel.
Decrease.

8. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
Compound-wound and shunt-wound.
Hydrogen.
Hydrometer.
Ventilation.

9. Define direct current...
Current that flows in only one direction.
In series.
It must prevent ignition of surrounding methane atmosphere.
E=IR.

10. Not a requirement of an explosion-proof enclosure?
It must prevent internal explosions.
Compound-wound and shunt-wound.
Current that flows in only one direction.
48 volts

11. What is the total resistance of three 16-ohm resistors connected in series?
It must prevent ignition of surrounding methane atmosphere.
400 ampere-hours.
A bi-directional device that can pass current in either direction.
48 ohms.

12. The unit of measurement of current is...
Amperes.
A counter-EMF.
Hydrogen.
Soft iron.

13. Which current flows in only one direction?
Direct current.
Wattmeter.
Voltage.
Soft iron.

14. What is Ohm's Law?
48 volts
Compound-wound and shunt-wound.
E=IR.
15 minutes.

15. How many kilowatts are used to develop 50 horsepower?
Distance.
Flush thoroughly with water.
500 volts.
37.3 kilowatts

16. The longer the conductor - the greater the...
Resistance.
60 ohms.
Decrease.
Series-wound.

17. What is the rate that work is done or heat is dissipated?
Direct current.
No.4 AWG.
Power.
1.260 to 1.280.

18. What is the hazard of pouring water into battery acid 'electrolyte'?

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19. What should be used in treating an eye injury caused by battery acid?
In series.
Voltage.
Clean water.
Compound-wound and shunt-wound.

20. When should water be added to a battery?
Resistance.
Resistance.
After charging
200 volts

21. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
Hydrogen.
In series.
E=IR.
100 ohms

22. Which of the following motors CANNOT be run without a load?
Flush thoroughly with water.
In parallel.
Series-wound.
Higher current with voltage remaining the same.

23. What voltage would be required to force 10 amps through a 50-ohm resistor?
Wattmeter.
6 volts.
In series.
500 volts.

24. What is the total resistance of four 25-ohm resistors connected in series?
Heat
Direct current.
100 ohms
It must prevent internal explosions.

25. What is the total voltage of eight 12-volt batteries connected in series?
The movement of electrons in a circuit.
After charging
4.0 ohms.
96 volts.

26. 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...
Heat
Stays the same.
Ohms.
Treat for physical shock.

27. The best insulator against the lines of magnetic force is...
Voltage.
Hydrometer.
Wattmeter.
Distance.

28. Power is measured with a...
A. Total resistance is less than the smallest resistor.
Flush thoroughly with water.
Wattmeter.
Reverse.

29. Voltage in a parallel circuit...
Current.
Stays the same.
Ammeter.
In series.

30. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...
Repel each other.
Ohms.
400 ampere-hours.
4.0 ohms.

31. What is the total resistance of four 15-ohm resistors connected in series?
60 ohms.
400 ampere-hours.
E=IR.
In parallel.

32. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
96 volts.
No.4 AWG.
A. Total resistance is less than the smallest resistor.
Current.

33. The armature of a direct current motor - when running - generates...
Better speed control on motors.
E=IR.
A counter-EMF.
Power.

34. The specific gravity of the electrolyte of a fully charged battery should be...
15 minutes.
Amperes.
75 volts.
1.260 to 1.280.

35. How must two 12-volt batteries be connected in order to increase the current capacity?
15 minutes.
A wire wound resistor.
In parallel.
60 ohms.

36. Unlike poles of a magnet will...
Attract each other.
After charging
Ventilation.
60 ohms.

37. Resistance is measured with a...
Power.
Ohmmeter.
96 volts.
A counter-EMF.

38. What must be provided at underground battery charging stations?
Flush thoroughly with water.
Ohmmeter.
Repel each other.
Ventilation.

39. Which of the following stays the same in all parts of a series circuit?
Ventilation.
Decrease.
Current
Treat for physical shock.

40. What is the flow of electrons in a conductor?
Current.
Ammeter.
4.8 ohms
In parallel.

41. Not an electro-magnet?
6 volts.
E=IR.
A wire wound resistor.
Compound-wound and shunt-wound.

42. What is the total voltage of four 12-volt batteries connected in series?
Voltmeter.
48 volts
No.4 AWG.
The opposition to flow of electrons in a circuit.

43. Current is measured with a (an)...
Until the victim receives medical attention.
Ammeter.
Resistance.
Current that flows in only one direction.

44. Storage battery charging stations must be provided with what kind of current protection?
4.0 ohms.
1.260 to 1.280.
Reverse.
746 watts.

45. The unit of measurement of power is...
Watts.
Burns will appear only at the point where contact is made to the energized circuit.
Clean water.
A counter-EMF.

46. Voltage is measured with a...
Distance.
Current that flows in one direction only.
96 volts.
Voltmeter.

47. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
8 ohms.
4.8 ohms
36 volts.
75 volts.

48. How many watts are in one horsepower?
746 watts.
1.260 to 1.280.
Current that flows in only one direction.
Compound-wound and shunt-wound.

49. The instrument used to check the electrolyte of a battery is a...
Better speed control on motors.
Compound-wound and shunt-wound.
Hydrometer.
60 ohms.

50. Define direct current...
48 ohms.
200 volts
4.0 ohms.
Current that flows in one direction only.