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

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2. Define resistance...
Resistance.
15 minutes.
746 watts.
The opposition to flow of electrons in a circuit.

3. The unit of measurement of resistance is?
60 ohms.
Voltmeter.
Ohms.
Direct current.

4. The best insulator against the lines of magnetic force is...
Watts.
Better speed control on motors.
Hydrogen.
Distance.

5. What is the total voltage of four 9-volt batteries connected in a series?
Repel each other.
4.0 ohms.
500 volts.
36 volts.

6. Voltage is measured with a...
Ohms.
Series-wound.
Voltmeter.
15 minutes.

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

8. If the cross-sectional area of a conductor is increased - its resistance will...
Resistance.
Ventilation.
Heat
Decrease.

9. The core of an electro-magnet should be made of...
Current.
Hydrogen.
Direct current.
Soft iron.

10. Resistance is measured with a...
Ohmmeter.
Series-wound.
After charging
48 volts

11. The specific gravity of the electrolyte of a fully charged battery should be...
1.260 to 1.280.
Burns will appear only at the point where contact is made to the energized circuit.
37.3 kilowatts
Amperes.

12. The unit of measurement of power is...
Watts.
The movement of electrons in a circuit.
48 ohms.
15 minutes.

13. What is the equivalent resistance of two 8-ohm resistors connected in parallel?
A bi-directional device that can pass current in either direction.
4.0 ohms.
15 minutes.
Clean water.

14. Power is measured with a...
60 ohms.
Reverse.
Higher current with voltage remaining the same.
Wattmeter.

15. What voltage is required to force 5 amps through a 15-ohm resistor?
746 watts.
Compound-wound and shunt-wound.
75 volts.
Voltmeter.

16. How must two 12-volt batteries be connected in order to increase the current capacity?
In parallel.
Attract each other.
8 ohms.
Less than the resistance of either resistor.

17. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
Reverse.
4.8 ohms
Direct current.
746 watts.

18. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
37.3 kilowatts
Stays the same.
Power.
8 ohms.

19. Which of the following stays the same in all parts of a series circuit?
A counter-EMF.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Current
Current.

20. The instrument used to check the electrolyte of a battery is a...
Hydrometer.
400 ampere-hours.
E=IR.
Reverse.

21. What is the total resistance of four 15-ohm resistors connected in series?
60 ohms.
Direct current.
6 volts.
746 watts.

22. What is the unit of electromotive force or electric pressure?
It must prevent ignition of surrounding methane atmosphere.
Clean water.
Voltage.
Stays the same.

23. The longer the conductor - the greater the...
Voltmeter.
Better speed control on motors.
Stays the same.
Resistance.

24. Not a requirement of an explosion-proof enclosure?
15 minutes.
500 volts.
It must prevent internal explosions.
The opposition to flow of electrons in a circuit.

25. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
6 volts.
Hydrogen.
48 ohms.
Stays the same.

26. Define current...
No.4 AWG.
Compound-wound and shunt-wound.
The movement of electrons in a circuit.
746 watts.

27. How long should treatment for shock be continued?
Voltage.
Soft iron.
Current that flows in only one direction.
Until the victim receives medical attention.

28. Which of the following is a requirement of an explosion-proof enclosure?
Hydrometer.
48 volts
It must prevent ignition of surrounding methane atmosphere.
Treat for physical shock.

29. How many watts are in one horsepower?
746 watts.
Reverse.
500 volts.
200 volts

30. Define direct current...
Compound-wound and shunt-wound.
It must prevent ignition of surrounding methane atmosphere.
The movement of electrons in a circuit.
Current that flows in one direction only.

31. 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...
Power.
Voltage.
It must prevent ignition of surrounding methane atmosphere.
Treat for physical shock.

32. Which of the following motors CANNOT be run without a load?
Burns will appear only at the point where contact is made to the energized circuit.
Series-wound.
Decrease.
1.260 to 1.280.

33. What should be used in treating an eye injury caused by battery acid?
Clean water.
6 volts.
Until the victim receives medical attention.
Less than the resistance of either resistor.

34. Voltage in a parallel circuit...
Power.
Stays the same.
37.3 kilowatts
A bi-directional device that can pass current in either direction.

35. What is the total voltage of eight 12-volt batteries connected in series?
Current that flows in only one direction.
Watts.
96 volts.
48 volts

36. In a parallel circuit...
Voltage.
Wattmeter.
A bi-directional device that can pass current in either direction.
A. Total resistance is less than the smallest resistor.

37. Like poles of a magnet will...
Less than the resistance of either resistor.
Repel each other.
37.3 kilowatts
The movement of electrons in a circuit.

38. What must be provided at underground battery charging stations?
Ventilation.
Compound-wound and shunt-wound.
Until the victim receives medical attention.
Flush thoroughly with water.

39. The most common reason that solid state devices fail is...
Heat
A wire wound resistor.
8 ohms.
500 volts.

40. The first step in treating a chemical burn - such as one caused by battery acid - is to...
Heat
Until the victim receives medical attention.
Flush thoroughly with water.
500 volts.

41. Current is measured with a (an)...
Resistance.
Decrease.
37.3 kilowatts
Ammeter.

42. Storage battery charging stations must be provided with what kind of current protection?
Reverse.
The opposition to flow of electrons in a circuit.
Current.
Compound-wound and shunt-wound.

43. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
96 volts.
In series.
Resistance.
Attract each other.

44. Which of the following motors are considered to be constant or nearly constant speed?
Ohms.
Compound-wound and shunt-wound.
Until the victim receives medical attention.
Current that flows in one direction only.

45. What voltage would be required to force 10 amps through a 20-ohm resistor?
48 volts
Attract each other.
200 volts
No.4 AWG.

46. Batteries connected in parallel provide...
Clean water.
A counter-EMF.
Higher current with voltage remaining the same.
Series-wound.

47. What is the first step in treating a chemical burn of the eye?
Higher current with voltage remaining the same.
A bi-directional device that can pass current in either direction.
Flush the burn the clean water.
4.8 ohms

48. What voltage would be required to force 10 amps through a 50-ohm resistor?
500 volts.
Current.
Power.
A wire wound resistor.

49. The unit of measurement of current is...
Amperes.
Decrease.
96 volts.
Reverse.

50. What is the opposition to flow of electric current?
Resistance.
Series-wound.
100 ohms
Stays the same.

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DC Theory

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