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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. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...
Higher current with voltage remaining the same.
400 ampere-hours.
Less than the resistance of either resistor.
Soft iron.

2. What is the total resistance of three 16-ohm resistors connected in series?
48 ohms.
Hydrogen.
No.4 AWG.
Ohmmeter.

3. What voltage would be required to force 10 amps through a 20-ohm resistor?
200 volts
500 volts.
Wattmeter.
60 ohms.

4. The unit of measurement of current is...
Heat
Current
Amperes.
4.8 ohms

5. A triac is?
Current
A bi-directional device that can pass current in either direction.
Watts.
Soft iron.

6. Unlike poles of a magnet will...
Clean water.
Attract each other.
In series.
Higher current with voltage remaining the same.

7. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
Better speed control on motors.
Resistance.
8 ohms.
Current that flows in only one direction.

8. Current is measured with a (an)...
Stays the same.
Higher current with voltage remaining the same.
Ammeter.
Voltmeter.

9. The longer the conductor - the greater the...
Ammeter.
A. Total resistance is less than the smallest resistor.
Current that flows in one direction only.
Resistance.

10. Voltage in a parallel circuit...
Stays the same.
Flush the burn the clean water.
Hydrogen.
Hydrogen.

11. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
500 volts.
Stays the same.
4.8 ohms
8 ohms.

12. What is the total resistance of four 25-ohm resistors connected in series?
Until the victim receives medical attention.
100 ohms
No.4 AWG.
Series-wound.

13. In a parallel circuit...
The movement of electrons in a circuit.
A. Total resistance is less than the smallest resistor.
Burns will appear only at the point where contact is made to the energized circuit.
36 volts.

14. Which of the following motors CANNOT be run without a load?
Series-wound.
Current that flows in only one direction.
60 ohms.
746 watts.

15. Which of the following motors are considered to be constant or nearly constant speed?
Compound-wound and shunt-wound.
Reverse.
Less than the resistance of either resistor.
Stays the same.

16. What is the total voltage of four 9-volt batteries connected in a series?
36 volts.
Decrease.
400 ampere-hours.
Resistance.

17. Not true about electrical shocks?
Flush thoroughly with water.
The movement of electrons in a circuit.
Repel each other.
Burns will appear only at the point where contact is made to the energized circuit.

18. What is the opposition to flow of electric current?
Resistance.
75 volts.
After charging
Hydrometer.

19. How long should treatment for shock be continued?
36 volts.
A counter-EMF.
Until the victim receives medical attention.
E=IR.

20. If the cross-sectional area of a conductor is increased - its resistance will...
Current.
Repel each other.
Ventilation.
Decrease.

21. What is the total voltage of eight 12-volt batteries connected in series?
The movement of electrons in a circuit.
Amperes.
Current
96 volts.

22. What must be provided at underground battery charging stations?
It must prevent internal explosions.
Reverse.
Ventilation.
Current that flows in one direction only.

23. Storage battery charging stations must be provided with what kind of current protection?
Flush thoroughly with water.
Reverse.
Watts.
Stays the same.

24. Define current...
48 volts
4.8 ohms
Voltmeter.
The movement of electrons in a circuit.

25. The combined resistance of two resistors in parallel is...
Until the victim receives medical attention.
8 ohms.
Less than the resistance of either resistor.
It must prevent ignition of surrounding methane atmosphere.

26. Power is measured with a...
Wattmeter.
Voltage.
48 volts
Amperes.

27. The unit of measurement of resistance is?
Voltage.
Repel each other.
Ohms.
Stays the same.

28. Define direct current...
Current that flows in one direction only.
In parallel.
Amperes.
200 volts

29. What is the first step in treating a chemical burn of the eye?
Flush the burn the clean water.
Ohmmeter.
It must prevent internal explosions.
Clean water.

30. Which of the following is a requirement of an explosion-proof enclosure?
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
A. Total resistance is less than the smallest resistor.
It must prevent ignition of surrounding methane atmosphere.
8 ohms.

31. Define direct current...
60 ohms.
Heat
Current that flows in only one direction.
Voltage.

32. How many watts are in one horsepower?
400 ampere-hours.
No.4 AWG.
Stays the same.
746 watts.

33. Which of the following stays the same in all parts of a series circuit?
In series.
Repel each other.
36 volts.
Current

34. The explosive gas that is generated when a battery is charging is...
Higher current with voltage remaining the same.
Hydrogen.
Less than the resistance of either resistor.
In series.

35. The most common reason that solid state devices fail is...
Direct current.
Heat
1.260 to 1.280.
In parallel.

36. What is the rate that work is done or heat is dissipated?
Power.
48 volts
A wire wound resistor.
Stays the same.

37. What is the total voltage of two 6-volt batteries connected in parallel?
In series.
6 volts.
Watts.
Attract each other.

38. Resistance is measured with a...
After charging
Ohmmeter.
Better speed control on motors.
37.3 kilowatts

39. The specific gravity of the electrolyte of a fully charged battery should be...
Attract each other.
200 volts
1.260 to 1.280.
Stays the same.

40. When should water be added to a battery?
After charging
Burns will appear only at the point where contact is made to the energized circuit.
36 volts.
In series.

41. 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.
36 volts.
200 volts

42. What is the flow of electrons in a conductor?
Soft iron.
Power.
Current.
Better speed control on motors.

43. Batteries connected in parallel provide...
37.3 kilowatts
Distance.
Higher current with voltage remaining the same.
Watts.

44. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
Resistance.
Hydrogen.
37.3 kilowatts
Burns will appear only at the point where contact is made to the energized circuit.

45. How many kilowatts are used to develop 50 horsepower?
Repel each other.
37.3 kilowatts
Better speed control on motors.
Heat

46. The unit of measurement of power is...
75 volts.
No.4 AWG.
Attract each other.
Watts.

47. Which current flows in only one direction?
1.260 to 1.280.
Direct current.
60 ohms.
Ohms.

48. Resistors are rated in ohms and...
Watts.
Current.
No.4 AWG.
15 minutes.

49. Like poles of a magnet will...
Repel each other.
96 volts.
Current.
Current that flows in one direction only.

50. The best insulator against the lines of magnetic force is...
96 volts.
Flush the burn the clean water.
Distance.
Ventilation.

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DC Theory

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