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DC Theory

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. Power is measured with a...
Stays the same.
No.4 AWG.
Wattmeter.
Repel each other.

2. The combined resistance of two resistors in parallel is...
Amperes.
48 volts
Less than the resistance of either resistor.
Current.

3. What voltage would be required to force 10 amps through a 50-ohm resistor?
500 volts.
A bi-directional device that can pass current in either direction.
Voltage.
A. Total resistance is less than the smallest resistor.

4. Unlike poles of a magnet will...
Attract each other.
200 volts
6 volts.
It must prevent ignition of surrounding methane atmosphere.

5. Voltage is measured with a...
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Voltmeter.
Heat
Ohmmeter.

6. Define current...
The opposition to flow of electrons in a circuit.
The movement of electrons in a circuit.
400 ampere-hours.
A wire wound resistor.

7. What should be used in treating an eye injury caused by battery acid?
Clean water.
Better speed control on motors.
Watts.
48 volts

8. Which current flows in only one direction?
No.4 AWG.
Amperes.
Attract each other.
Direct current.

9. The unit of measurement of current is...
Amperes.
Direct current.
Stays the same.
Current that flows in one direction only.

10. The core of an electro-magnet should be made of...
A counter-EMF.
Ohms.
Decrease.
Soft iron.

11. Not a requirement of an explosion-proof enclosure?
Until the victim receives medical attention.
It must prevent internal explosions.
Repel each other.
200 volts

12. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
Flush the burn the clean water.
500 volts.
No.4 AWG.
746 watts.

13. How many kilowatts are used to develop 50 horsepower?
Current that flows in only one direction.
The opposition to flow of electrons in a circuit.
Higher current with voltage remaining the same.
37.3 kilowatts

14. Storage battery charging stations must be provided with what kind of current protection?
Reverse.
No.4 AWG.
4.8 ohms
400 ampere-hours.

15. What is the total voltage of four 12-volt batteries connected in series?
6 volts.
1.260 to 1.280.
In parallel.
48 volts

16. The unit of measurement of resistance is?
After charging
Ohms.
No.4 AWG.
It must prevent ignition of surrounding methane atmosphere.

17. What is the total voltage of eight 12-volt batteries connected in series?
Stays the same.
In series.
96 volts.
500 volts.

18. Current is measured with a (an)...
48 volts
Ammeter.
Until the victim receives medical attention.
Hydrometer.

19. In a parallel circuit...
Hydrogen.
Wattmeter.
A. Total resistance is less than the smallest resistor.
Flush thoroughly with water.

20. Current in a series circuit...
36 volts.
60 ohms.
A wire wound resistor.
Stays the same.

21. What must be provided at underground battery charging stations?
Current that flows in only one direction.
Direct current.
Compound-wound and shunt-wound.
Ventilation.

22. When should water be added to a battery?
Current that flows in one direction only.
After charging
The movement of electrons in a circuit.
In series.

23. What is the equivalent resistance of two 8-ohm resistors connected in parallel?
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
The movement of electrons in a circuit.
4.0 ohms.
Less than the resistance of either resistor.

24. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
Soft iron.
In series.
4.8 ohms
No.4 AWG.

25. Chemical burns caused by battery acid should be washed with clean water for at least...
Series-wound.
15 minutes.
Watts.
Higher current with voltage remaining the same.

26. What voltage is required to force 5 amps through a 15-ohm resistor?
75 volts.
A counter-EMF.
48 volts
Series-wound.

27. A triac is?
Ammeter.
37.3 kilowatts
A bi-directional device that can pass current in either direction.
Heat

28. Define direct current...
15 minutes.
Current that flows in one direction only.
Series-wound.
A bi-directional device that can pass current in either direction.

29. Which of the following is a requirement of an explosion-proof enclosure?
It must prevent ignition of surrounding methane atmosphere.
Series-wound.
Hydrogen.
A. Total resistance is less than the smallest resistor.

30. The first step in treating a chemical burn - such as one caused by battery acid - is to...
Flush thoroughly with water.
Ohmmeter.
In parallel.
Amperes.

31. If the cross-sectional area of a conductor is increased - its resistance will...
Flush the burn the clean water.
Decrease.
Stays the same.
Better speed control on motors.

32. Not true about electrical shocks?
Hydrometer.
Burns will appear only at the point where contact is made to the energized circuit.
Compound-wound and shunt-wound.
The movement of electrons in a circuit.

33. The unit of measurement of power is...
Ohms.
Watts.
Current.
Amperes.

34. 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.
60 ohms.
36 volts.
746 watts.

35. Like poles of a magnet will...
Burns will appear only at the point where contact is made to the energized circuit.
The opposition to flow of electrons in a circuit.
Current
Repel each other.

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

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37. Which of the following motors CANNOT be run without a load?
Series-wound.
A bi-directional device that can pass current in either direction.
Voltage.
Flush thoroughly with water.

38. Define direct current...
400 ampere-hours.
Higher current with voltage remaining the same.
Current that flows in only one direction.
A bi-directional device that can pass current in either direction.

39. How long should treatment for shock be continued?
Until the victim receives medical attention.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Current that flows in one direction only.
Voltmeter.

40. What is the unit of electromotive force or electric pressure?
Resistance.
400 ampere-hours.
Higher current with voltage remaining the same.
Voltage.

41. What is the opposition to flow of electric current?
48 ohms.
48 volts
Until the victim receives medical attention.
Resistance.

42. Not an electro-magnet?
Voltage.
Hydrometer.
A wire wound resistor.
1.260 to 1.280.

43. What is the first step in treating a chemical burn of the eye?
Flush the burn the clean water.
400 ampere-hours.
Series-wound.
4.8 ohms

44. Which of the following stays the same in all parts of a series circuit?
Current.
200 volts
Current
Flush the burn the clean water.

45. How many watts are in one horsepower?
Voltmeter.
746 watts.
500 volts.
In series.

46. The longer the conductor - the greater the...
500 volts.
Voltmeter.
Resistance.
No.4 AWG.

47. What is the flow of electrons in a conductor?
100 ohms
A. Total resistance is less than the smallest resistor.
Current.
Higher current with voltage remaining the same.

48. The best insulator against the lines of magnetic force is...
Heat
400 ampere-hours.
Distance.
Flush the burn the clean water.

49. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
A wire wound resistor.
A bi-directional device that can pass current in either direction.
Soft iron.
In series.

50. Voltage in a parallel circuit...
Series-wound.
Voltmeter.
Stays the same.
Voltage.