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DC Theory

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 rate that work is done or heat is dissipated?
In series.
Power.
Stays the same.
Less than the resistance of either resistor.

2. Batteries connected in parallel provide...
Soft iron.
In series.
15 minutes.
Higher current with voltage remaining the same.

3. The instrument used to check the electrolyte of a battery is a...
Better speed control on motors.
Hydrometer.
746 watts.
Burns will appear only at the point where contact is made to the energized circuit.

4. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
Hydrogen.
Decrease.
Stays the same.
In series.

5. Like poles of a magnet will...
Series-wound.
96 volts.
Repel each other.
No.4 AWG.

6. Which current flows in only one direction?
6 volts.
Direct current.
In series.
Series-wound.

7. What is the total voltage of eight 12-volt batteries connected in series?
96 volts.
E=IR.
Attract each other.
746 watts.

8. What is the flow of electrons in a conductor?
Voltmeter.
Current.
Hydrometer.
Ammeter.

9. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
Attract each other.
6 volts.
4.8 ohms
Stays the same.

10. How must two 12-volt batteries be connected in order to increase the current capacity?
It must prevent internal explosions.
In parallel.
Amperes.
After charging

11. Not true about electrical shocks?
In series.
Distance.
Current
Burns will appear only at the point where contact is made to the energized circuit.

12. What voltage would be required to force 10 amps through a 50-ohm resistor?
Wattmeter.
Distance.
500 volts.
Direct current.

13. Chemical burns caused by battery acid should be washed with clean water for at least...
Current that flows in only one direction.
A. Total resistance is less than the smallest resistor.
15 minutes.
Voltmeter.

14. What voltage would be required to force 10 amps through a 20-ohm resistor?
200 volts
In series.
Resistance.
Repel each other.

15. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
746 watts.
Until the victim receives medical attention.
Direct current.
No.4 AWG.

16. How long should treatment for shock be continued?
The movement of electrons in a circuit.
Clean water.
4.0 ohms.
Until the victim receives medical attention.

17. The longer the conductor - the greater the...
400 ampere-hours.
Less than the resistance of either resistor.
In series.
Resistance.

18. Define direct current...
Until the victim receives medical attention.
After charging
Current that flows in only one direction.
Hydrogen.

19. Resistors are rated in ohms and...
Watts.
Hydrometer.
8 ohms.
75 volts.

20. What voltage is required to force 5 amps through a 15-ohm resistor?
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
Hydrogen.
75 volts.
Watts.

21. Current is measured with a (an)...
Ammeter.
Current
15 minutes.
Power.

22. What is the total voltage of four 12-volt batteries connected in series?
200 volts
Resistance.
Distance.
48 volts

23. What should be used in treating an eye injury caused by battery acid?
Watts.
Stays the same.
Clean water.
It must prevent internal explosions.

24. What is the unit of electromotive force or electric pressure?
Repel each other.
15 minutes.
Voltage.
Attract each other.

25. Trailing cable on DC-powered mobile haulage equipment must be at least...
Ohmmeter.
75 volts.
15 minutes.
No.4 AWG.

26. Storage battery charging stations must be provided with what kind of current protection?
Distance.
Compound-wound and shunt-wound.
Reverse.
Higher current with voltage remaining the same.

27. What is the equivalent resistance of two 8-ohm resistors connected in parallel?
4.8 ohms
4.0 ohms.
Stays the same.
Clean water.

28. Resistance is measured with a...
Ammeter.
Ohmmeter.
200 volts
Voltmeter.

29. What is the total resistance of three 16-ohm resistors connected in series?
400 ampere-hours.
Series-wound.
Until the victim receives medical attention.
48 ohms.

30. Power is measured with a...
E=IR.
Ohms.
Wattmeter.
Watts.

31. The combined resistance of two resistors in parallel is...
Repel each other.
Less than the resistance of either resistor.
Resistance.
100 ohms

32. The most common reason that solid state devices fail is...
Heat
Until the victim receives medical attention.
60 ohms.
Hydrometer.

33. Which of the following is a requirement of an explosion-proof enclosure?
Clean water.
Hydrogen.
It must prevent ignition of surrounding methane atmosphere.
15 minutes.

34. How many kilowatts are used to develop 50 horsepower?
Ventilation.
Flush the burn the clean water.
37.3 kilowatts
It must prevent ignition of surrounding methane atmosphere.

35. Voltage is measured with a...
Voltmeter.
E=IR.
It must prevent internal explosions.
It must prevent ignition of surrounding methane atmosphere.

36. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
The movement of electrons in a circuit.
Hydrogen.
Resistance.
In series.

37. The unit of measurement of resistance is?
Wattmeter.
Better speed control on motors.
Ohms.
Watts.

38. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
A counter-EMF.
Soft iron.
4.8 ohms
In series.

39. What must be provided at underground battery charging stations?
Series-wound.
Ventilation.
It must prevent internal explosions.
Watts.

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

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41. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
It must prevent internal explosions.
8 ohms.
E=IR.
In parallel.

42. Voltage in a parallel circuit...
60 ohms.
36 volts.
Stays the same.
Resistance.

43. What is the total voltage of four 9-volt batteries connected in a series?
36 volts.
Reverse.
100 ohms
Direct current.

44. 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...
Ammeter.
In series.
Amperes.
Treat for physical shock.

45. The advantage of DC over AC is that DC offers...
400 ampere-hours.
Compound-wound and shunt-wound.
In series.
Better speed control on motors.

46. What is the opposition to flow of electric current?
Ammeter.
Resistance.
8 ohms.
6 volts.

47. What is the total resistance of four 25-ohm resistors connected in series?
200 volts
Watts.
Resistance.
100 ohms

48. The unit of measurement of current is...
Amperes.
Stays the same.
Reverse.
Wattmeter.

49. The armature of a direct current motor - when running - generates...
Higher current with voltage remaining the same.
Current.
A counter-EMF.
36 volts.

50. What is Ohm's Law?
Watts.
48 ohms.
4.0 ohms.
E=IR.

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DC Theory

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