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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. Resistance is measured with a...
In series.
Resistance.
Heat
Ohmmeter.

2. The combined resistance of two resistors in parallel is...
Less than the resistance of either resistor.
A counter-EMF.
In parallel.
E=IR.

3. Define direct current...
No.4 AWG.
75 volts.
It must prevent ignition of surrounding methane atmosphere.
Current that flows in one direction only.

4. Define direct current...
It must prevent ignition of surrounding methane atmosphere.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Current that flows in only one direction.
Soft iron.

5. The specific gravity of the electrolyte of a fully charged battery should be...
4.8 ohms
8 ohms.
Hydrogen.
1.260 to 1.280.

6. Unlike poles of a magnet will...
15 minutes.
Series-wound.
Attract each other.
36 volts.

7. What is the unit of electromotive force or electric pressure?
8 ohms.
Stays the same.
75 volts.
Voltage.

8. The explosive gas that is generated when a battery is charging is...
96 volts.
Hydrogen.
A bi-directional device that can pass current in either direction.
Decrease.

9. Storage battery charging stations must be provided with what kind of current protection?
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
A. Total resistance is less than the smallest resistor.
200 volts
Reverse.

10. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
In series.
Direct current.
Stays the same.
Current that flows in one direction only.

11. Trailing cable on DC-powered mobile haulage equipment must be at least...
Voltage.
No.4 AWG.
Series-wound.
Resistance.

12. The advantage of DC over AC is that DC offers...
Reverse.
Better speed control on motors.
4.0 ohms.
Current.

13. What is the total resistance of three 16-ohm resistors connected in series?
Current that flows in one direction only.
48 ohms.
The movement of electrons in a circuit.
Watts.

14. The longer the conductor - the greater the...
Resistance.
Clean water.
Watts.
The movement of electrons in a circuit.

15. A triac is?
Series-wound.
Soft iron.
A bi-directional device that can pass current in either direction.
500 volts.

16. How must two 12-volt batteries be connected in order to increase the current capacity?
Decrease.
In parallel.
No.4 AWG.
Resistance.

17. 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.
37.3 kilowatts

18. Not a requirement of an explosion-proof enclosure?
Attract each other.
It must prevent internal explosions.
Heat
Amperes.

19. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Flush the burn the clean water.
No.4 AWG.
Ohms.

20. Which current flows in only one direction?
75 volts.
Burns will appear only at the point where contact is made to the energized circuit.
Direct current.
Clean water.

21. Voltage is measured with a...
Stays the same.
Until the victim receives medical attention.
Repel each other.
Voltmeter.

22. The unit of measurement of resistance is?
4.8 ohms
Ohms.
Flush the burn the clean water.
8 ohms.

23. Not true about electrical shocks?
Burns will appear only at the point where contact is made to the energized circuit.
The opposition to flow of electrons in a circuit.
96 volts.
4.8 ohms

24. When should water be added to a battery?
A counter-EMF.
Attract each other.
In series.
After charging

25. Current in a series circuit...
Wattmeter.
A counter-EMF.
Stays the same.
48 volts

26. Which of the following stays the same in all parts of a series circuit?
400 ampere-hours.
In parallel.
No.4 AWG.
Current

27. Which of the following motors are considered to be constant or nearly constant speed?
Better speed control on motors.
Compound-wound and shunt-wound.
Stays the same.
36 volts.

28. What must be provided at underground battery charging stations?
Ventilation.
The movement of electrons in a circuit.
Better speed control on motors.
No.4 AWG.

29. Resistors are rated in ohms and...
75 volts.
A counter-EMF.
Watts.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.

30. The instrument used to check the electrolyte of a battery is a...
Flush thoroughly with water.
A. Total resistance is less than the smallest resistor.
Hydrometer.
Ventilation.

31. How many watts are in one horsepower?
A. Total resistance is less than the smallest resistor.
36 volts.
746 watts.
It must prevent ignition of surrounding methane atmosphere.

32. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
746 watts.
4.8 ohms
Better speed control on motors.
Repel each other.

33. In a parallel circuit...
A. Total resistance is less than the smallest resistor.
A bi-directional device that can pass current in either direction.
8 ohms.
Ammeter.

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...
The movement of electrons in a circuit.
75 volts.
Treat for physical shock.
Ohmmeter.

35. What is Ohm's Law?
746 watts.
E=IR.
A counter-EMF.
Ammeter.

36. What should be used in treating an eye injury caused by battery acid?
The movement of electrons in a circuit.
Treat for physical shock.
Clean water.
100 ohms

37. If the cross-sectional area of a conductor is increased - its resistance will...
Ohmmeter.
Decrease.
Flush the burn the clean water.
Distance.

38. Define current...
8 ohms.
500 volts.
The movement of electrons in a circuit.
Series-wound.

39. Which of the following motors CANNOT be run without a load?
Resistance.
Series-wound.
Ohms.
After charging

40. Like poles of a magnet will...
36 volts.
Stays the same.
Repel each other.
E=IR.

41. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
Current.
A counter-EMF.
8 ohms.
4.0 ohms.

42. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...
Better speed control on motors.
Amperes.
400 ampere-hours.
4.0 ohms.

43. What is the flow of electrons in a conductor?
A wire wound resistor.
Current.
No.4 AWG.
Current that flows in only one direction.

44. What is the total voltage of eight 12-volt batteries connected in series?
Distance.
Higher current with voltage remaining the same.
4.0 ohms.
96 volts.

45. What is the first step in treating a chemical burn of the eye?
In series.
Flush the burn the clean water.
It must prevent ignition of surrounding methane atmosphere.
746 watts.

46. Power is measured with a...
No.4 AWG.
Wattmeter.
Heat
Higher current with voltage remaining the same.

47. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
Distance.
In series.
Hydrogen.
100 ohms

48. What voltage would be required to force 10 amps through a 20-ohm resistor?
No.4 AWG.
A bi-directional device that can pass current in either direction.
Stays the same.
200 volts

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

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50. The unit of measurement of power is...
Watts.
Stays the same.
746 watts.
A counter-EMF.

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DC Theory

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