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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. How must two 12-volt batteries be connected in order to increase the current capacity?
Direct current.
Series-wound.
In parallel.
Current.

2. The first step in treating a chemical burn - such as one caused by battery acid - is to...
Flush thoroughly with water.
The opposition to flow of electrons in a circuit.
A. Total resistance is less than the smallest resistor.
96 volts.

3. The instrument used to check the electrolyte of a battery is a...
Stays the same.
Hydrometer.
A bi-directional device that can pass current in either direction.
No.4 AWG.

4. What is the flow of electrons in a conductor?
Watts.
Higher current with voltage remaining the same.
No.4 AWG.
Current.

5. What is Ohm's Law?
No.4 AWG.
The movement of electrons in a circuit.
E=IR.
Reverse.

6. The combined resistance of two resistors in parallel is...
Current
Watts.
Less than the resistance of either resistor.
Watts.

7. Which of the following motors CANNOT be run without a load?
Repel each other.
400 ampere-hours.
75 volts.
Series-wound.

8. Current in a series circuit...
Stays the same.
The opposition to flow of electrons in a circuit.
Current that flows in one direction only.
200 volts

9. The core of an electro-magnet should be made of...
36 volts.
Power.
Resistance.
Soft iron.

10. Voltage in a parallel circuit...
746 watts.
Stays the same.
Ohmmeter.
A wire wound resistor.

11. What is the total resistance of four 25-ohm resistors connected in series?
Wattmeter.
Flush thoroughly with water.
4.0 ohms.
100 ohms

12. Resistance is measured with a...
Heat
The opposition to flow of electrons in a circuit.
Ohmmeter.
It must prevent internal explosions.

13. 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.
500 volts.
36 volts.
Voltage.

14. What voltage would be required to force 10 amps through a 20-ohm resistor?
No.4 AWG.
Current that flows in only one direction.
200 volts
No.4 AWG.

15. In a parallel circuit...
Stays the same.
Repel each other.
A. Total resistance is less than the smallest resistor.
15 minutes.

16. How many watts are in one horsepower?
200 volts
500 volts.
746 watts.
Higher current with voltage remaining the same.

17. Current is measured with a (an)...
Ammeter.
48 ohms.
A. Total resistance is less than the smallest resistor.
37.3 kilowatts

18. Resistors are rated in ohms and...
It must prevent internal explosions.
E=IR.
6 volts.
Watts.

19. How long should treatment for shock be continued?
Direct current.
Wattmeter.
Until the victim receives medical attention.
A. Total resistance is less than the smallest resistor.

20. The advantage of DC over AC is that DC offers...
96 volts.
4.0 ohms.
E=IR.
Better speed control on motors.

21. What is the equivalent resistance of two 8-ohm resistors connected in parallel?
4.0 ohms.
75 volts.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Decrease.

22. Not true about electrical shocks?
Hydrogen.
500 volts.
Current.
Burns will appear only at the point where contact is made to the energized circuit.

23. 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...
Resistance.
Treat for physical shock.
No.4 AWG.
200 volts

24. Power is measured with a...
Ohmmeter.
15 minutes.
Wattmeter.
Watts.

25. A triac is?
A bi-directional device that can pass current in either direction.
No.4 AWG.
6 volts.
4.8 ohms

26. The longer the conductor - the greater the...
48 ohms.
36 volts.
In parallel.
Resistance.

27. Voltage is measured with a...
15 minutes.
No.4 AWG.
Voltmeter.
Current that flows in one direction only.

28. Not a requirement of an explosion-proof enclosure?
746 watts.
200 volts
It must prevent internal explosions.
A wire wound resistor.

29. The armature of a direct current motor - when running - generates...
500 volts.
Resistance.
200 volts
A counter-EMF.

30. 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'.
746 watts.
1.260 to 1.280.
Flush thoroughly with water.

31. The unit of measurement of power is...
No.4 AWG.
No.4 AWG.
Watts.
A bi-directional device that can pass current in either direction.

32. What is the unit of electromotive force or electric pressure?
Wattmeter.
75 volts.
A. Total resistance is less than the smallest resistor.
Voltage.

33. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
Current that flows in only one direction.
75 volts.
No.4 AWG.
Ventilation.

34. Which of the following stays the same in all parts of a series circuit?
Distance.
The opposition to flow of electrons in a circuit.
Current that flows in only one direction.
Current

35. What is the first step in treating a chemical burn of the eye?
Flush the burn the clean water.
The opposition to flow of electrons in a circuit.
48 volts
96 volts.

36. Not an electro-magnet?
8 ohms.
1.260 to 1.280.
A. Total resistance is less than the smallest resistor.
A wire wound resistor.

37. The unit of measurement of current is...
It must prevent ignition of surrounding methane atmosphere.
Ammeter.
Amperes.
Current that flows in only one direction.

38. Batteries connected in parallel provide...
96 volts.
Hydrogen.
Higher current with voltage remaining the same.
Current that flows in only one direction.

39. What voltage is required to force 5 amps through a 15-ohm resistor?
Less than the resistance of either resistor.
Resistance.
75 volts.
Attract each other.

40. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
37.3 kilowatts
Reverse.
200 volts
8 ohms.

41. The explosive gas that is generated when a battery is charging is...
36 volts.
Hydrogen.
500 volts.
E=IR.

42. What is the total voltage of two 6-volt batteries connected in parallel?
6 volts.
Hydrometer.
No.4 AWG.
96 volts.

43. What is the opposition to flow of electric current?
Attract each other.
Resistance.
48 ohms.
Better speed control on motors.

44. Which current flows in only one direction?
8 ohms.
Heat
Direct current.
100 ohms

45. What is the total voltage of four 9-volt batteries connected in a series?
400 ampere-hours.
36 volts.
A bi-directional device that can pass current in either direction.
Ohmmeter.

46. If the cross-sectional area of a conductor is increased - its resistance will...
It must prevent ignition of surrounding methane atmosphere.
Decrease.
Attract each other.
Power.

47. What must be provided at underground battery charging stations?
Resistance.
Ventilation.
In parallel.
Decrease.

48. What should be used in treating an eye injury caused by battery acid?
Stays the same.
Clean water.
After charging
Current that flows in one direction only.

49. Storage battery charging stations must be provided with what kind of current protection?
The opposition to flow of electrons in a circuit.
37.3 kilowatts
4.0 ohms.
Reverse.

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

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DC Theory

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