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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. Which of the following motors are considered to be constant or nearly constant speed?
15 minutes.
Hydrogen.
Compound-wound and shunt-wound.
Decrease.

2. What is the opposition to flow of electric current?
Resistance.
Burns will appear only at the point where contact is made to the energized circuit.
746 watts.
Voltage.

3. Define direct current...
Current that flows in only one direction.
96 volts.
4.8 ohms
Flush the burn the clean water.

4. Voltage in a parallel circuit...
Voltmeter.
It must prevent ignition of surrounding methane atmosphere.
Flush thoroughly with water.
Stays the same.

5. The core of an electro-magnet should be made of...
Soft iron.
Current that flows in one direction only.
Ventilation.
Series-wound.

6. Current in a series circuit...
Stays the same.
Better speed control on motors.
No.4 AWG.
Hydrogen.

7. What is the total resistance of four 25-ohm resistors connected in series?
Watts.
100 ohms
Less than the resistance of either resistor.
Repel each other.

8. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
100 ohms
200 volts
4.8 ohms
In parallel.

9. The unit of measurement of current is...
It must prevent internal explosions.
Amperes.
746 watts.
4.8 ohms

10. The longer the conductor - the greater the...
Hydrometer.
In parallel.
Clean water.
Resistance.

11. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
100 ohms
Resistance.
Burns will appear only at the point where contact is made to the energized circuit.
8 ohms.

12. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
8 ohms.
Hydrogen.
48 volts
Burns will appear only at the point where contact is made to the energized circuit.

13. Define direct current...
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
The movement of electrons in a circuit.
Current that flows in only one direction.
Current that flows in one direction only.

14. 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...
Treat for physical shock.
Distance.
Burns will appear only at the point where contact is made to the energized circuit.
Ohms.

15. How many watts are in one horsepower?
746 watts.
Current.
4.0 ohms.
200 volts

16. Resistors are rated in ohms and...
No.4 AWG.
Repel each other.
Until the victim receives medical attention.
Watts.

17. What is the total resistance of three 16-ohm resistors connected in series?
48 ohms.
500 volts.
Series-wound.
Stays the same.

18. Voltage is measured with a...
Resistance.
746 watts.
Voltmeter.
Hydrogen.

19. What is Ohm's Law?
Ventilation.
E=IR.
Series-wound.
60 ohms.

20. How must two 12-volt batteries be connected in order to increase the current capacity?
Reverse.
6 volts.
500 volts.
In parallel.

21. What voltage is required to force 5 amps through a 15-ohm resistor?
48 ohms.
500 volts.
75 volts.
In series.

22. What is the total voltage of four 9-volt batteries connected in a series?
Watts.
36 volts.
Repel each other.
In series.

23. Power is measured with a...
After charging
Wattmeter.
36 volts.
Ohms.

24. How long should treatment for shock be continued?
It must prevent internal explosions.
Direct current.
500 volts.
Until the victim receives medical attention.

25. Resistance is measured with a...
Ohms.
Ohmmeter.
Treat for physical shock.
A. Total resistance is less than the smallest resistor.

26. 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.
Current.
Watts.
Attract each other.

27. Which current flows in only one direction?
Direct current.
Watts.
In series.
Clean water.

28. Not an electro-magnet?
A wire wound resistor.
In series.
Clean water.
Stays the same.

29. What is the rate that work is done or heat is dissipated?
Heat
Power.
400 ampere-hours.
Clean water.

30. How many kilowatts are used to develop 50 horsepower?
Amperes.
48 volts
36 volts.
37.3 kilowatts

31. Chemical burns caused by battery acid should be washed with clean water for at least...
The opposition to flow of electrons in a circuit.
15 minutes.
Ventilation.
4.0 ohms.

32. The combined resistance of two resistors in parallel is...
48 ohms.
Voltmeter.
Less than the resistance of either resistor.
No.4 AWG.

33. What is the flow of electrons in a conductor?
A wire wound resistor.
48 ohms.
Less than the resistance of either resistor.
Current.

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

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35. The armature of a direct current motor - when running - generates...
A counter-EMF.
200 volts
Current that flows in one direction only.
After charging

36. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
In series.
Heat
Current that flows in only one direction.
Higher current with voltage remaining the same.

37. Which of the following is a requirement of an explosion-proof enclosure?
It must prevent ignition of surrounding methane atmosphere.
Flush the burn the clean water.
Higher current with voltage remaining the same.
The movement of electrons in a circuit.

38. The unit of measurement of resistance is?
Ohms.
In series.
4.8 ohms
36 volts.

39. Storage battery charging stations must be provided with what kind of current protection?
4.0 ohms.
500 volts.
Hydrogen.
Reverse.

40. What is the first step in treating a chemical burn of the eye?
Amperes.
Flush the burn the clean water.
E=IR.
No.4 AWG.

41. Like poles of a magnet will...
Ohms.
Watts.
No.4 AWG.
Repel each other.

42. Batteries connected in parallel provide...
Until the victim receives medical attention.
Current.
Burns will appear only at the point where contact is made to the energized circuit.
Higher current with voltage remaining the same.

43. What is the unit of electromotive force or electric pressure?
6 volts.
Current that flows in only one direction.
Voltage.
Attract each other.

44. What voltage would be required to force 10 amps through a 50-ohm resistor?
500 volts.
37.3 kilowatts
It must prevent internal explosions.
In series.

45. The instrument used to check the electrolyte of a battery is a...
Hydrometer.
The movement of electrons in a circuit.
Distance.
Hydrogen.

46. Unlike poles of a magnet will...
1.260 to 1.280.
Ohms.
Current that flows in only one direction.
Attract each other.

47. What voltage would be required to force 10 amps through a 20-ohm resistor?
The opposition to flow of electrons in a circuit.
Decrease.
Reverse.
200 volts

48. Current is measured with a (an)...
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
6 volts.
Ammeter.
Ohms.

49. Define resistance...
400 ampere-hours.
The opposition to flow of electrons in a circuit.
Repel each other.
It must prevent internal explosions.

50. Not a requirement of an explosion-proof enclosure?
Power.
It must prevent internal explosions.
Stays the same.
60 ohms.