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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 unit of measurement of resistance is?
It must prevent internal explosions.
Until the victim receives medical attention.
1.260 to 1.280.
Ohms.

2. Batteries connected in parallel provide...
Higher current with voltage remaining the same.
Distance.
After charging
Flush the burn the clean water.

3. Resistance is measured with a...
Voltage.
Ohmmeter.
Ventilation.
No.4 AWG.

4. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
4.8 ohms
Wattmeter.
Hydrogen.
15 minutes.

5. What voltage is required to force 5 amps through a 15-ohm resistor?
Current
746 watts.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
75 volts.

6. Which current flows in only one direction?
E=IR.
60 ohms.
Direct current.
Current.

7. What is the total voltage of two 6-volt batteries connected in parallel?
4.8 ohms
6 volts.
1.260 to 1.280.
Ohmmeter.

8. Not true about electrical shocks?
60 ohms.
1.260 to 1.280.
Burns will appear only at the point where contact is made to the energized circuit.
37.3 kilowatts

9. The unit of measurement of power is...
Repel each other.
Decrease.
A bi-directional device that can pass current in either direction.
Watts.

10. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...
400 ampere-hours.
In series.
Resistance.
Clean water.

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

12. When should water be added to a battery?
After charging
In parallel.
Ventilation.
Decrease.

13. What is Ohm's Law?
Wattmeter.
A wire wound resistor.
E=IR.
Flush thoroughly with water.

14. Define current...
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Hydrogen.
The movement of electrons in a circuit.
A counter-EMF.

15. What is the total resistance of four 25-ohm resistors connected in series?
Ammeter.
15 minutes.
No.4 AWG.
100 ohms

16. Which of the following stays the same in all parts of a series circuit?
Until the victim receives medical attention.
Current that flows in one direction only.
Soft iron.
Current

17. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
The movement of electrons in a circuit.
In series.
In parallel.
Series-wound.

18. What is the total resistance of four 15-ohm resistors connected in series?
Compound-wound and shunt-wound.
Attract each other.
60 ohms.
400 ampere-hours.

19. The unit of measurement of current is...
Heat
Distance.
Amperes.
75 volts.

20. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
400 ampere-hours.
No.4 AWG.
Current that flows in only one direction.
Ohmmeter.

21. What is the first step in treating a chemical burn of the eye?
Flush the burn the clean water.
Ventilation.
Until the victim receives medical attention.
In series.

22. Define direct current...
6 volts.
Until the victim receives medical attention.
200 volts
Current that flows in only one direction.

23. What must be provided at underground battery charging stations?
In series.
60 ohms.
6 volts.
Ventilation.

24. What is the total voltage of four 9-volt batteries connected in a series?
Flush thoroughly with water.
36 volts.
48 ohms.
Reverse.

25. Voltage in a parallel circuit...
60 ohms.
Hydrometer.
Current that flows in one direction only.
Stays the same.

26. Chemical burns caused by battery acid should be washed with clean water for at least...
15 minutes.
Burns will appear only at the point where contact is made to the energized circuit.
746 watts.
Flush the burn the clean water.

27. What is the total resistance of three 16-ohm resistors connected in series?
48 ohms.
Hydrometer.
75 volts.
The movement of electrons in a circuit.

28. The advantage of DC over AC is that DC offers...
Ammeter.
After charging
Better speed control on motors.
60 ohms.

29. The explosive gas that is generated when a battery is charging is...
No.4 AWG.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Hydrogen.
Stays the same.

30. Define direct current...
Current that flows in one direction only.
15 minutes.
Attract each other.
Stays the same.

31. What voltage would be required to force 10 amps through a 20-ohm resistor?
A. Total resistance is less than the smallest resistor.
Soft iron.
Better speed control on motors.
200 volts

32. In a parallel circuit...
Less than the resistance of either resistor.
A counter-EMF.
48 ohms.
A. Total resistance is less than the smallest resistor.

33. The best insulator against the lines of magnetic force is...
After charging
Distance.
Watts.
Hydrogen.

34. The longer the conductor - the greater the...
A wire wound resistor.
Wattmeter.
Resistance.
Until the victim receives medical attention.

35. The specific gravity of the electrolyte of a fully charged battery should be...
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Ammeter.
8 ohms.
1.260 to 1.280.

36. Which of the following motors are considered to be constant or nearly constant speed?
In series.
Voltmeter.
Compound-wound and shunt-wound.
Ohms.

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

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38. What is the equivalent resistance of two 8-ohm resistors connected in parallel?
Ammeter.
Soft iron.
Power.
4.0 ohms.

39. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
8 ohms.
Until the victim receives medical attention.
In series.
Ammeter.

40. If the cross-sectional area of a conductor is increased - its resistance will...
In parallel.
Decrease.
A. Total resistance is less than the smallest resistor.
After charging

41. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
96 volts.
Series-wound.
4.8 ohms
E=IR.

42. What is the rate that work is done or heat is dissipated?
A. Total resistance is less than the smallest resistor.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Power.
Watts.

43. The first step in treating a chemical burn - such as one caused by battery acid - is to...
Power.
Ventilation.
Ohms.
Flush thoroughly with water.

44. What is the total voltage of four 12-volt batteries connected in series?
Direct current.
500 volts.
Flush the burn the clean water.
48 volts

45. What is the opposition to flow of electric current?
Resistance.
Voltmeter.
4.8 ohms
Clean water.

46. What should be used in treating an eye injury caused by battery acid?
200 volts
Clean water.
Soft iron.
8 ohms.

47. Define resistance...
The opposition to flow of electrons in a circuit.
Burns will appear only at the point where contact is made to the energized circuit.
Decrease.
48 ohms.

48. Storage battery charging stations must be provided with what kind of current protection?
Power.
Reverse.
60 ohms.
Ammeter.

49. What is the unit of electromotive force or electric pressure?
Hydrometer.
Treat for physical shock.
Current
Voltage.

50. A triac is?
E=IR.
A bi-directional device that can pass current in either direction.
A. Total resistance is less than the smallest resistor.
Ammeter.

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DC Theory

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