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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. What is the total voltage of four 12-volt batteries connected in series?
Stays the same.
15 minutes.
48 volts
Power.

2. How long should treatment for shock be continued?
Until the victim receives medical attention.
48 volts
Better speed control on motors.
4.8 ohms

3. What should be used in treating an eye injury caused by battery acid?
75 volts.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Ohms.
Clean water.

4. The most common reason that solid state devices fail is...
Hydrogen.
746 watts.
Heat
Repel each other.

5. What voltage would be required to force 10 amps through a 50-ohm resistor?
Amperes.
Resistance.
In series.
500 volts.

6. Define direct current...
A. Total resistance is less than the smallest resistor.
Current that flows in one direction only.
37.3 kilowatts
Current.

7. What is the total resistance of three 16-ohm resistors connected in series?
60 ohms.
746 watts.
Compound-wound and shunt-wound.
48 ohms.

8. How must two 12-volt batteries be connected in order to increase the current capacity?
In parallel.
Wattmeter.
Clean water.
Watts.

9. Trailing cable on DC-powered mobile haulage equipment must be at least...
Compound-wound and shunt-wound.
Until the victim receives medical attention.
No.4 AWG.
It must prevent internal explosions.

10. The longer the conductor - the greater the...
Stays the same.
Hydrogen.
Resistance.
746 watts.

11. Define resistance...
Stays the same.
Ammeter.
A bi-directional device that can pass current in either direction.
The opposition to flow of electrons in a circuit.

12. The combined resistance of two resistors in parallel is...
Less than the resistance of either resistor.
Power.
4.8 ohms
Current

13. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
It must prevent internal explosions.
96 volts.
4.8 ohms
Series-wound.

14. Resistance is measured with a...
Voltage.
A counter-EMF.
Watts.
Ohmmeter.

15. Power is measured with a...
Compound-wound and shunt-wound.
Wattmeter.
Treat for physical shock.
Distance.

16. How many watts are in one horsepower?
746 watts.
4.0 ohms.
60 ohms.
A bi-directional device that can pass current in either direction.

17. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
Treat for physical shock.
8 ohms.
In series.
400 ampere-hours.

18. Storage battery charging stations must be provided with what kind of current protection?
A. Total resistance is less than the smallest resistor.
Reverse.
No.4 AWG.
E=IR.

19. Define direct current...
Amperes.
Resistance.
75 volts.
Current that flows in only one direction.

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

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21. Current is measured with a (an)...
Ammeter.
1.260 to 1.280.
Direct current.
Until the victim receives medical attention.

22. What must be provided at underground battery charging stations?
4.8 ohms
Until the victim receives medical attention.
Ammeter.
Ventilation.

23. Not true about electrical shocks?
Burns will appear only at the point where contact is made to the energized circuit.
Current that flows in one direction only.
E=IR.
Less than the resistance of either resistor.

24. Define current...
The movement of electrons in a circuit.
Attract each other.
Soft iron.
Ohms.

25. Unlike poles of a magnet will...
Attract each other.
500 volts.
Soft iron.
Flush the burn the clean water.

26. In a parallel circuit...
Voltage.
Better speed control on motors.
A. Total resistance is less than the smallest resistor.
Current that flows in one direction only.

27. The explosive gas that is generated when a battery is charging is...
Repel each other.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Hydrogen.
Stays the same.

28. What is the total resistance of four 15-ohm resistors connected in series?
Current.
Soft iron.
Ventilation.
60 ohms.

29. The armature of a direct current motor - when running - generates...
A counter-EMF.
It must prevent internal explosions.
Ammeter.
75 volts.

30. Batteries connected in parallel provide...
48 ohms.
Wattmeter.
Higher current with voltage remaining the same.
Treat for physical shock.

31. Which of the following is a requirement of an explosion-proof enclosure?
It must prevent ignition of surrounding methane atmosphere.
Direct current.
Hydrometer.
Higher current with voltage remaining the same.

32. Which current flows in only one direction?
Voltage.
Direct current.
Attract each other.
E=IR.

33. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
200 volts
Wattmeter.
A counter-EMF.
8 ohms.

34. Chemical burns caused by battery acid should be washed with clean water for at least...
Current.
15 minutes.
Resistance.
37.3 kilowatts

35. How many kilowatts are used to develop 50 horsepower?
Reverse.
Distance.
Resistance.
37.3 kilowatts

36. The advantage of DC over AC is that DC offers...
Reverse.
Burns will appear only at the point where contact is made to the energized circuit.
Current.
Better speed control on motors.

37. Voltage is measured with a...
4.8 ohms
Resistance.
Voltmeter.
Watts.

38. Which of the following stays the same in all parts of a series circuit?
1.260 to 1.280.
Current
A wire wound resistor.
Decrease.

39. What is the rate that work is done or heat is dissipated?
Current.
A bi-directional device that can pass current in either direction.
A wire wound resistor.
Power.

40. What is the total voltage of two 6-volt batteries connected in parallel?
In series.
Reverse.
6 volts.
No.4 AWG.

41. The unit of measurement of resistance is?
Current.
A. Total resistance is less than the smallest resistor.
Ohms.
A bi-directional device that can pass current in either direction.

42. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
Wattmeter.
37.3 kilowatts
Better speed control on motors.
No.4 AWG.

43. What is the total voltage of eight 12-volt batteries connected in series?
60 ohms.
96 volts.
400 ampere-hours.
After charging

44. The core of an electro-magnet should be made of...
In series.
Voltage.
1.260 to 1.280.
Soft iron.

45. The specific gravity of the electrolyte of a fully charged battery should be...
It must prevent ignition of surrounding methane atmosphere.
1.260 to 1.280.
100 ohms
No.4 AWG.

46. Not a requirement of an explosion-proof enclosure?
Watts.
It must prevent internal explosions.
Better speed control on motors.
Distance.

47. What is Ohm's Law?
6 volts.
Current.
Burns will appear only at the point where contact is made to the energized circuit.
E=IR.

48. What is the unit of electromotive force or electric pressure?
Voltage.
Stays the same.
4.0 ohms.
15 minutes.

49. The best insulator against the lines of magnetic force is...
Flush thoroughly with water.
Current that flows in one direction only.
37.3 kilowatts
Distance.

50. The unit of measurement of power is...
Resistance.
4.8 ohms
Watts.
Wattmeter.

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DC Theory

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