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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. Which of the following motors CANNOT be run without a load?
4.0 ohms.
Current that flows in one direction only.
Series-wound.
In series.

2. Which current flows in only one direction?
400 ampere-hours.
A wire wound resistor.
Direct current.
Decrease.

3. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
The movement of electrons in a circuit.
Current
A bi-directional device that can pass current in either direction.
In series.

4. The specific gravity of the electrolyte of a fully charged battery should be...
In series.
48 ohms.
1.260 to 1.280.
8 ohms.

5. What is the flow of electrons in a conductor?
200 volts
Current.
E=IR.
The movement of electrons in a circuit.

6. What is the unit of electromotive force or electric pressure?
Resistance.
Less than the resistance of either resistor.
Compound-wound and shunt-wound.
Voltage.

7. What is the total voltage of eight 12-volt batteries connected in series?
No.4 AWG.
Series-wound.
96 volts.
Amperes.

8. Define direct current...
Current that flows in one direction only.
1.260 to 1.280.
4.8 ohms
Ventilation.

9. Which of the following stays the same in all parts of a series circuit?
Better speed control on motors.
In parallel.
Current
96 volts.

10. Storage battery charging stations must be provided with what kind of current protection?
Direct current.
Wattmeter.
Reverse.
Voltage.

11. How must two 12-volt batteries be connected in order to increase the current capacity?
In parallel.
36 volts.
Burns will appear only at the point where contact is made to the energized circuit.
Ventilation.

12. The longer the conductor - the greater the...
Distance.
Watts.
Resistance.
Hydrogen.

13. A triac is?
A bi-directional device that can pass current in either direction.
96 volts.
Power.
Flush thoroughly with water.

14. Current is measured with a (an)...
Ammeter.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
1.260 to 1.280.
Less than the resistance of either resistor.

15. What is the total resistance of three 16-ohm resistors connected in series?
Heat
48 ohms.
400 ampere-hours.
1.260 to 1.280.

16. The unit of measurement of current is...
Amperes.
Distance.
Stays the same.
96 volts.

17. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
Hydrogen.
After charging
Resistance.
No.4 AWG.

18. What must be provided at underground battery charging stations?
60 ohms.
Watts.
Ventilation.
Less than the resistance of either resistor.

19. Which of the following motors are considered to be constant or nearly constant speed?
Flush the burn the clean water.
Higher current with voltage remaining the same.
Voltmeter.
Compound-wound and shunt-wound.

20. Voltage in a parallel circuit...
Stays the same.
60 ohms.
Ohms.
96 volts.

21. The unit of measurement of power is...
Watts.
8 ohms.
Reverse.
A counter-EMF.

22. The core of an electro-magnet should be made of...
Better speed control on motors.
Soft iron.
Voltage.
48 volts

23. What is the equivalent resistance of two 16-ohm resistors connected in parallel?
Until the victim receives medical attention.
8 ohms.
It must prevent ignition of surrounding methane atmosphere.
The movement of electrons in a circuit.

24. What is the total resistance of four 25-ohm resistors connected in series?
100 ohms
Wattmeter.
Higher current with voltage remaining the same.
4.0 ohms.

25. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
4.8 ohms
Wattmeter.
Repel each other.
Stays the same.

26. Voltage is measured with a...
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
6 volts.
Voltmeter.
It must prevent ignition of surrounding methane atmosphere.

27. Chemical burns caused by battery acid should be washed with clean water for at least...
Ventilation.
15 minutes.
A bi-directional device that can pass current in either direction.
4.0 ohms.

28. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
A. Total resistance is less than the smallest resistor.
Repel each other.
In series.
Wattmeter.

29. How many kilowatts are used to develop 50 horsepower?
Power.
No.4 AWG.
37.3 kilowatts
Hydrometer.

30. What is the rate that work is done or heat is dissipated?
Power.
The movement of electrons in a circuit.
It must prevent ignition of surrounding methane atmosphere.
4.0 ohms.

31. The armature of a direct current motor - when running - generates...
Reverse.
A counter-EMF.
Watts.
746 watts.

32. 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.
Stays the same.
A wire wound resistor.
60 ohms.

33. How long should treatment for shock be continued?
Until the victim receives medical attention.
48 volts
It must prevent internal explosions.
Watts.

34. The unit of measurement of resistance is?
Stays the same.
Until the victim receives medical attention.
No.4 AWG.
Ohms.

35. How many watts are in one horsepower?
Ohms.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
746 watts.
Resistance.

36. Not a requirement of an explosion-proof enclosure?
6 volts.
There is a hazard of blowing the contents back into your face - 'explosive reaction'.
It must prevent internal explosions.
746 watts.

37. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
A counter-EMF.
Current that flows in one direction only.
No.4 AWG.
60 ohms.

38. When should water be added to a battery?
No.4 AWG.
Watts.
After charging
Voltmeter.

39. Which of the following is a requirement of an explosion-proof enclosure?
Until the victim receives medical attention.
Flush thoroughly with water.
Compound-wound and shunt-wound.
It must prevent ignition of surrounding methane atmosphere.

40. What is the total resistance of four 15-ohm resistors connected in series?
Ohmmeter.
4.8 ohms
60 ohms.
Power.

41. What is the total voltage of four 9-volt batteries connected in a series?
Ohmmeter.
Distance.
Treat for physical shock.
36 volts.

42. The advantage of DC over AC is that DC offers...
Better speed control on motors.
Ohmmeter.
500 volts.
Resistance.

43. What voltage is required to force 5 amps through a 15-ohm resistor?
Voltmeter.
75 volts.
After charging
Distance.

44. Resistance is measured with a...
Ohmmeter.
In parallel.
After charging
6 volts.

45. Current in a series circuit...
Resistance.
1.260 to 1.280.
Stays the same.
Flush the burn the clean water.

46. If the cross-sectional area of a conductor is increased - its resistance will...
Clean water.
Until the victim receives medical attention.
Decrease.
Flush thoroughly with water.

47. The instrument used to check the electrolyte of a battery is a...
Wattmeter.
Hydrometer.
Voltage.
4.8 ohms

48. The explosive gas that is generated when a battery is charging is...
Ammeter.
Current.
Hydrogen.
Watts.

49. What is the total voltage of two 6-volt batteries connected in parallel?
Watts.
It must prevent internal explosions.
6 volts.
Current

50. Define current...
746 watts.
A bi-directional device that can pass current in either direction.
The movement of electrons in a circuit.
It must prevent ignition of surrounding methane atmosphere.

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DC Theory

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