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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. In a parallel circuit...
Voltmeter.
A. Total resistance is less than the smallest resistor.
It must prevent internal explosions.
Better speed control on motors.

2. Batteries connected in parallel provide...
Watts.
Current that flows in one direction only.
Direct current.
Higher current with voltage remaining the same.

3. What is the total voltage of eight 12-volt batteries connected in series?
96 volts.
Treat for physical shock.
Higher current with voltage remaining the same.
Current.

4. What is the equivalent resistance of two 8-ohm resistors connected in parallel?
Hydrometer.
4.0 ohms.
Reverse.
Current that flows in one direction only.

5. A triac is?
A bi-directional device that can pass current in either direction.
500 volts.
Current that flows in only one direction.
Attract each other.

6. How many kilowatts are used to develop 50 horsepower?
Reverse.
After charging
A bi-directional device that can pass current in either direction.
37.3 kilowatts

7. Which of the following is a requirement of an explosion-proof enclosure?
It must prevent ignition of surrounding methane atmosphere.
E=IR.
Wattmeter.
Hydrogen.

8. Trailing cable on DC-powered mobile haulage equipment must be at least...
Burns will appear only at the point where contact is made to the energized circuit.
Stays the same.
Current that flows in only one direction.
No.4 AWG.

9. What is the first step in treating a chemical burn of the eye?
Wattmeter.
Flush the burn the clean water.
48 ohms.
Ventilation.

10. The instrument used to check the electrolyte of a battery is a...
In parallel.
Stays the same.
Hydrometer.
Amperes.

11. Which of the following motors are considered to be constant or nearly constant speed?
500 volts.
Amperes.
Until the victim receives medical attention.
Compound-wound and shunt-wound.

12. Which current flows in only one direction?
Direct current.
4.8 ohms
Amperes.
Flush the burn the clean water.

13. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
Distance.
A bi-directional device that can pass current in either direction.
Hydrogen.
Series-wound.

14. The unit of measurement of resistance is?
Ohms.
No.4 AWG.
The movement of electrons in a circuit.
Hydrogen.

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

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16. What is the total voltage of two 6-volt batteries connected in parallel?
48 ohms.
6 volts.
Voltage.
Less than the resistance of either resistor.

17. What is the total voltage of four 9-volt batteries connected in a series?
Hydrogen.
36 volts.
Heat
75 volts.

18. If the cross-sectional area of a conductor is increased - its resistance will...
Decrease.
100 ohms
Until the victim receives medical attention.
Flush the burn the clean water.

19. The unit of measurement of current is...
A bi-directional device that can pass current in either direction.
Amperes.
Treat for physical shock.
Series-wound.

20. Define current...
The movement of electrons in a circuit.
No.4 AWG.
It must prevent internal explosions.
Power.

21. What voltage would be required to force 10 amps through a 50-ohm resistor?
Ventilation.
4.0 ohms.
Until the victim receives medical attention.
500 volts.

22. What voltage would be required to force 10 amps through a 20-ohm resistor?
A bi-directional device that can pass current in either direction.
After charging
200 volts
15 minutes.

23. Power is measured with a...
Wattmeter.
400 ampere-hours.
36 volts.
4.0 ohms.

24. Not an electro-magnet?
60 ohms.
A wire wound resistor.
4.8 ohms
Ohmmeter.

25. Not true about electrical shocks?
48 ohms.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Burns will appear only at the point where contact is made to the energized circuit.
37.3 kilowatts

26. The explosive gas that is generated when a battery is charging is...
15 minutes.
Hydrogen.
Current
Stays the same.

27. The advantage of DC over AC is that DC offers...
No.4 AWG.
Better speed control on motors.
It must prevent ignition of surrounding methane atmosphere.
100 ohms

28. The core of an electro-magnet should be made of...
A counter-EMF.
Soft iron.
It must prevent internal explosions.
15 minutes.

29. How long should treatment for shock be continued?
Ventilation.
37.3 kilowatts
Until the victim receives medical attention.
Heat

30. How many watts are in one horsepower?
48 ohms.
1.260 to 1.280.
Until the victim receives medical attention.
746 watts.

31. What should be used in treating an eye injury caused by battery acid?
Clean water.
In parallel.
100 ohms
Resistance.

32. What is the rate that work is done or heat is dissipated?
It must prevent ignition of surrounding methane atmosphere.
Power.
It must prevent internal explosions.
Until the victim receives medical attention.

33. Unlike poles of a magnet will...
Watts.
Distance.
Clean water.
Attract each other.

34. Current is measured with a (an)...
75 volts.
Ammeter.
Reverse.
Watts.

35. Voltage is measured with a...
Voltmeter.
The movement of electrons in a circuit.
6 volts.
Better speed control on motors.

36. Storage battery charging stations must be provided with what kind of current protection?
Hydrometer.
Hydrogen.
Reverse.
200 volts

37. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
The movement of electrons in a circuit.
Amperes.
4.8 ohms
Current that flows in only one direction.

38. Resistors are rated in ohms and...
Stays the same.
Heat
Repel each other.
Watts.

39. The most common reason that solid state devices fail is...
Heat
Flush the burn the clean water.
No.4 AWG.
Direct current.

40. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
Series-wound.
Watts.
Direct current.
8 ohms.

41. What is the flow of electrons in a conductor?
Series-wound.
Higher current with voltage remaining the same.
Current.
6 volts.

42. What is the unit of electromotive force or electric pressure?
Ventilation.
Flush thoroughly with water.
Voltage.
36 volts.

43. What is the opposition to flow of electric current?
Wattmeter.
In parallel.
Resistance.
6 volts.

44. Current in a series circuit...
1.260 to 1.280.
200 volts
Stays the same.
Ventilation.

45. Voltage in a parallel circuit...
Treat for physical shock.
No.4 AWG.
37.3 kilowatts
Stays the same.

46. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
400 ampere-hours.
No.4 AWG.
Ventilation.

47. 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...
Stays the same.
Treat for physical shock.
Decrease.
A. Total resistance is less than the smallest resistor.

48. Which of the following stays the same in all parts of a series circuit?
Current
No.4 AWG.
It must prevent ignition of surrounding methane atmosphere.
Stays the same.

49. What must be provided at underground battery charging stations?
Direct current.
A bi-directional device that can pass current in either direction.
Higher current with voltage remaining the same.
Ventilation.

50. The unit of measurement of power is...
It must prevent ignition of surrounding methane atmosphere.
Watts.
75 volts.
No.4 AWG.