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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. Define direct current...
Current that flows in one direction only.
500 volts.
E=IR.
6 volts.

2. Which of the following motors CANNOT be run without a load?
Amperes.
Series-wound.
Decrease.
It must prevent internal explosions.

3. 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...
Treat for physical shock.
Hydrogen.
48 ohms.
In series.

4. How many watts are in one horsepower?
Clean water.
Flush the burn the clean water.
746 watts.
Watts.

5. What is the first step in treating a chemical burn of the eye?
Hydrogen.
Flush thoroughly with water.
It must prevent ignition of surrounding methane atmosphere.
Flush the burn the clean water.

6. In a parallel circuit...
15 minutes.
A. Total resistance is less than the smallest resistor.
1.260 to 1.280.
Treat for physical shock.

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.
Ammeter.
Decrease.

8. Which of the following is a requirement of an explosion-proof enclosure?
Power.
It must prevent ignition of surrounding methane atmosphere.
The movement of electrons in a circuit.
500 volts.

9. The best insulator against the lines of magnetic force is...
Resistance.
37.3 kilowatts
4.8 ohms
Distance.

10. Power is measured with a...
Resistance.
15 minutes.
Direct current.
Wattmeter.

11. Current in a series circuit...
Higher current with voltage remaining the same.
4.0 ohms.
Resistance.
Stays the same.

12. How many kilowatts are used to develop 50 horsepower?
15 minutes.
37.3 kilowatts
Watts.
Ventilation.

13. Voltage is measured with a...
Voltmeter.
A. Total resistance is less than the smallest resistor.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Current that flows in one direction only.

14. The most common reason that solid state devices fail is...
Heat
Direct current.
1.260 to 1.280.
Ammeter.

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

16. What is the total resistance of three 16-ohm resistors connected in series?
Until the victim receives medical attention.
Flush the burn the clean water.
48 ohms.
Heat

17. Chemical burns caused by battery acid should be washed with clean water for at least...
1.260 to 1.280.
746 watts.
Ohmmeter.
15 minutes.

18. Define current...
4.0 ohms.
4.8 ohms
The movement of electrons in a circuit.
It must prevent ignition of surrounding methane atmosphere.

19. The longer the conductor - the greater the...
Series-wound.
Resistance.
In series.
Hydrometer.

20. Batteries connected in parallel provide...
Higher current with voltage remaining the same.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
96 volts.
Flush thoroughly with water.

21. Define resistance...
The opposition to flow of electrons in a circuit.
4.8 ohms
15 minutes.
Current that flows in only one direction.

22. Not true about electrical shocks?
Compound-wound and shunt-wound.
Burns will appear only at the point where contact is made to the energized circuit.
6 volts.
Decrease.

23. What is the total voltage of two 6-volt batteries connected in parallel?
Heat
Current
6 volts.
4.8 ohms

24. Trailing cable on DC-powered mobile haulage equipment must be at least...
Ohmmeter.
Burns will appear only at the point where contact is made to the energized circuit.
No.4 AWG.
A. Total resistance is less than the smallest resistor.

25. What is the opposition to flow of electric current?
The opposition to flow of electrons in a circuit.
Resistance.
Compound-wound and shunt-wound.
Ohms.

26. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
Decrease.
Compound-wound and shunt-wound.
A bi-directional device that can pass current in either direction.
In series.

27. Current is measured with a (an)...
Wattmeter.
Stays the same.
In parallel.
Ammeter.

28. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...
A counter-EMF.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
400 ampere-hours.
Burns will appear only at the point where contact is made to the energized circuit.

29. What is the total voltage of four 9-volt batteries connected in a series?
36 volts.
Less than the resistance of either resistor.
In parallel.
A bi-directional device that can pass current in either direction.

30. The explosive gas that is generated when a battery is charging is...
8 ohms.
Watts.
Hydrogen.
37.3 kilowatts

31. The combined resistance of two resistors in parallel is...
Less than the resistance of either resistor.
36 volts.
Heat
Power.

32. The unit of measurement of power is...
400 ampere-hours.
The opposition to flow of electrons in a circuit.
Watts.
Direct current.

33. Not an electro-magnet?
400 ampere-hours.
A wire wound resistor.
In parallel.
Flush thoroughly with water.

34. How long should treatment for shock be continued?
Until the victim receives medical attention.
6 volts.
Stays the same.
Treat for physical shock.

35. Voltage in a parallel circuit...
Watts.
Stays the same.
Current
6 volts.

36. Like poles of a magnet will...
A bi-directional device that can pass current in either direction.
In series.
Ohmmeter.
Repel each other.

37. Define direct current...
Voltmeter.
48 ohms.
Current that flows in only one direction.
37.3 kilowatts

38. What is the total resistance of four 25-ohm resistors connected in series?
Heat
Until the victim receives medical attention.
96 volts.
100 ohms

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

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40. The core of an electro-magnet should be made of...
A. Total resistance is less than the smallest resistor.
No.4 AWG.
Decrease.
Soft iron.

41. What is the flow of electrons in a conductor?
Burns will appear only at the point where contact is made to the energized circuit.
Current.
1.260 to 1.280.
Watts.

42. What voltage would be required to force 10 amps through a 20-ohm resistor?
1.260 to 1.280.
200 volts
Current that flows in one direction only.
Resistance.

43. Which current flows in only one direction?
The opposition to flow of electrons in a circuit.
96 volts.
200 volts
Direct current.

44. Which of the following stays the same in all parts of a series circuit?
Resistance.
Higher current with voltage remaining the same.
Current
Direct current.

45. The specific gravity of the electrolyte of a fully charged battery should be...
500 volts.
1.260 to 1.280.
In series.
Attract each other.

46. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
No.4 AWG.
It must prevent internal explosions.
Ohmmeter.
Watts.

47. Resistors are rated in ohms and...
Resistance.
500 volts.
Watts.
36 volts.

48. What is the total voltage of four 12-volt batteries connected in series?
Flush thoroughly with water.
96 volts.
Better speed control on motors.
48 volts

49. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
4.8 ohms
Watts.
Until the victim receives medical attention.
After charging

50. Not a requirement of an explosion-proof enclosure?
200 volts
It must prevent internal explosions.
Hydrometer.
Ohms.

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DC Theory

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