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DC Theory

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. The most common reason that solid state devices fail is...
Heat
Hydrogen.
Watts.
After charging

2. Current is measured with a (an)...
Watts.
Heat
Attract each other.
Ammeter.

3. Resistors are rated in ohms and...
Amperes.
Watts.
37.3 kilowatts
In parallel.

4. How long should treatment for shock be continued?
Until the victim receives medical attention.
No.4 AWG.
Series-wound.
Watts.

5. The combined resistance of two resistors in parallel is...
A counter-EMF.
Less than the resistance of either resistor.
Direct current.
Resistance.

6. The longer the conductor - the greater the...
37.3 kilowatts
Resistance.
Stays the same.
It must prevent internal explosions.

7. What is the total resistance of four 15-ohm resistors connected in series?
75 volts.
Ammeter.
60 ohms.
500 volts.

8. How many watts are in one horsepower?
Hydrometer.
Direct current.
Soft iron.
746 watts.

9. Voltage is measured with a...
No.4 AWG.
Voltmeter.
1.260 to 1.280.
It must prevent ignition of surrounding methane atmosphere.

10. Current in a series circuit...
Higher current with voltage remaining the same.
Stays the same.
75 volts.
Watts.

11. Chemical burns caused by battery acid should be washed with clean water for at least...
15 minutes.
4.8 ohms
Ohmmeter.
Distance.

12. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
Repel each other.
Resistance.
No.4 AWG.
36 volts.

13. Which of the following motors CANNOT be run without a load?
Repel each other.
The opposition to flow of electrons in a circuit.
48 volts
Series-wound.

14. The unit of measurement of resistance is?
A counter-EMF.
Ohms.
Resistance.
Hydrometer.

15. The core of an electro-magnet should be made of...
Voltmeter.
Soft iron.
The opposition to flow of electrons in a circuit.
Hydrometer.

16. If the cross-sectional area of a conductor is increased - its resistance will...
Hydrometer.
Decrease.
Better speed control on motors.
A counter-EMF.

17. The specific gravity of the electrolyte of a fully charged battery should be...
1.260 to 1.280.
In series.
400 ampere-hours.
96 volts.

18. In a parallel circuit...
Current
Current.
500 volts.
A. Total resistance is less than the smallest resistor.

19. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
Stays the same.
In series.
Ammeter.
8 ohms.

20. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
200 volts
75 volts.
In series.
Hydrogen.

21. What is the total voltage of two 6-volt batteries connected in parallel?
Direct current.
6 volts.
1.260 to 1.280.
500 volts.

22. What is the total resistance of three 16-ohm resistors connected in series?
In series.
400 ampere-hours.
48 ohms.
Ventilation.

23. What should be used in treating an eye injury caused by battery acid?
Clean water.
Higher current with voltage remaining the same.
48 volts
No.4 AWG.

24. The unit of measurement of current is...
Hydrogen.
Amperes.
Stays the same.
A bi-directional device that can pass current in either direction.

25. What voltage would be required to force 10 amps through a 50-ohm resistor?
500 volts.
400 ampere-hours.
4.0 ohms.
Voltage.

26. How many kilowatts are used to develop 50 horsepower?
Watts.
37.3 kilowatts
1.260 to 1.280.
Ohmmeter.

27. The best insulator against the lines of magnetic force is...
Heat
4.0 ohms.
E=IR.
Distance.

28. What voltage would be required to force 10 amps through a 20-ohm resistor?
1.260 to 1.280.
200 volts
36 volts.
48 volts

29. What is the flow of electrons in a conductor?
Flush thoroughly with water.
Attract each other.
37.3 kilowatts
Current.

30. What is the total resistance of four 25-ohm resistors connected in series?
100 ohms
Flush thoroughly with water.
Series-wound.
500 volts.

31. What is the total voltage of four 9-volt batteries connected in a series?
E=IR.
36 volts.
Decrease.
No.4 AWG.

32. Define resistance...
The opposition to flow of electrons in a circuit.
Stays the same.
4.0 ohms.
60 ohms.

33. Define current...
In parallel.
Resistance.
No.4 AWG.
The movement of electrons in a circuit.

34. 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...
400 ampere-hours.
Treat for physical shock.
No.4 AWG.
Decrease.

35. Not a requirement of an explosion-proof enclosure?
400 ampere-hours.
Current that flows in one direction only.
It must prevent internal explosions.
Heat

36. Voltage in a parallel circuit...
The movement of electrons in a circuit.
Stays the same.
1.260 to 1.280.
500 volts.

37. What voltage is required to force 5 amps through a 15-ohm resistor?
48 volts
Flush thoroughly with water.
75 volts.
Amperes.

38. What is the equivalent resistance of two 8-ohm resistors connected in parallel?
Resistance.
4.0 ohms.
400 ampere-hours.
200 volts

39. The first step in treating a chemical burn - such as one caused by battery acid - is to...
Flush thoroughly with water.
75 volts.
Current
Voltmeter.

40. Storage battery charging stations must be provided with what kind of current protection?
In series.
8 ohms.
Reverse.
746 watts.

41. The advantage of DC over AC is that DC offers...
500 volts.
Flush thoroughly with water.
Better speed control on motors.
The movement of electrons in a circuit.

42. Trailing cable on DC-powered mobile haulage equipment must be at least...
Burns will appear only at the point where contact is made to the energized circuit.
Treat for physical shock.
No.4 AWG.
746 watts.

43. When should water be added to a battery?
After charging
E=IR.
37.3 kilowatts
48 ohms.

44. Which of the following is a requirement of an explosion-proof enclosure?
400 ampere-hours.
It must prevent ignition of surrounding methane atmosphere.
60 ohms.
Soft iron.

45. Like poles of a magnet will...
Repel each other.
Current that flows in one direction only.
Distance.
E=IR.

46. The instrument used to check the electrolyte of a battery is a...
Resistance.
4.0 ohms.
Hydrometer.
60 ohms.

47. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
Wattmeter.
Current.
A counter-EMF.
Hydrogen.

48. What is Ohm's Law?
E=IR.
Current that flows in one direction only.
Resistance.
Higher current with voltage remaining the same.

49. Which of the following stays the same in all parts of a series circuit?
No.4 AWG.
8 ohms.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Current

50. The armature of a direct current motor - when running - generates...
Series-wound.
No.4 AWG.
A counter-EMF.
Direct current.

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DC Theory

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