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DC Theory

Instructions:

Answer 50 questions in 30 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. Voltage is measured with a...
In parallel.
Voltmeter.
Power.
A wire wound resistor.

2. The specific gravity of the electrolyte of a fully charged battery should be...
1.260 to 1.280.
Hydrogen.
Until the victim receives medical attention.
Hydrometer.

3. What is the total resistance of four 25-ohm resistors connected in series?
Better speed control on motors.
E=IR.
100 ohms
Hydrometer.

4. If the cross-sectional area of a conductor is increased - its resistance will...
Decrease.
Soft iron.
Hydrogen.
Burns will appear only at the point where contact is made to the energized circuit.

5. What is the total voltage of two 6-volt batteries connected in parallel?
6 volts.
It must prevent internal explosions.
500 volts.
Resistance.

6. The explosive gas that is generated when a battery is charging is...
Watts.
Watts.
Hydrogen.
Hydrometer.

7. What is the equivalent resistance of two 8-ohm resistors connected in parallel?
A bi-directional device that can pass current in either direction.
500 volts.
The opposition to flow of electrons in a circuit.
4.0 ohms.

8. Not a requirement of an explosion-proof enclosure?
500 volts.
In series.
In parallel.
It must prevent internal explosions.

9. A battery capable of producing 20 amperes steadily for 20 hours at 80 degrees Fahrenheit would have an ampere-hour rating of...
E=IR.
The opposition to flow of electrons in a circuit.
400 ampere-hours.
No.4 AWG.

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

11. What is the flow of electrons in a conductor?
The opposition to flow of electrons in a circuit.
36 volts.
Current.
Power.

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

13. What should be used in treating an eye injury caused by battery acid?
Clean water.
48 volts
Current
Heat

14. You have three 12-volt batteries. How should you connect them in order to supply 36 volts?
In series.
Treat for physical shock.
Hydrogen.
Watts.

15. Which of the following motors are considered to be constant or nearly constant speed?
Resistance.
Compound-wound and shunt-wound.
15 minutes.
Higher current with voltage remaining the same.

16. The combined resistance of two resistors in parallel is...
Less than the resistance of either resistor.
Wattmeter.
200 volts
Flush thoroughly with water.

17. The dangerously explosive gas emitted by charging a lead-acid storage battery is...
Ohmmeter.
Hydrogen.
Wattmeter.
Amperes.

18. The unit of measurement of power is...
Current that flows in only one direction.
Compound-wound and shunt-wound.
Flush the burn the clean water.
Watts.

19. What is Ohm's Law?
Resistance.
Watts.
746 watts.
E=IR.

20. The unit of measurement of resistance is?
Ohms.
Hydrogen.
Repel each other.
Voltage.

21. What is the total voltage of four 12-volt batteries connected in series?
Direct current.
48 volts
Reverse.
1.260 to 1.280.

22. What voltage is required to force 5 amps through a 15-ohm resistor?
A. Total resistance is less than the smallest resistor.
75 volts.
A bi-directional device that can pass current in either direction.
Attract each other.

23. Which of the following motors CANNOT be run without a load?
Series-wound.
Power.
Current
A. Total resistance is less than the smallest resistor.

24. What is the equivalent resistance of an 8-ohm and a 12-ohm resistor connected in parallel?
Direct current.
15 minutes.
4.8 ohms
Attract each other.

25. Storage battery charging stations must be provided with what kind of current protection?
In series.
Resistance.
Reverse.
It must prevent ignition of surrounding methane atmosphere.

26. You have three 9-volt batteries. How should you connect them in order to supply 27 volts?
4.0 ohms.
96 volts.
Distance.
In series.

27. What voltage would be required to force 10 amps through a 50-ohm resistor?
500 volts.
Hydrogen.
Current.
Stays the same.

28. Resistors are rated in ohms and...
Series-wound.
Watts.
4.8 ohms
Less than the resistance of either resistor.

29. Which current flows in only one direction?
Amperes.
Voltage.
Direct current.
Resistance.

30. The most common reason that solid state devices fail is...
In series.
6 volts.
Heat
Ohmmeter.

31. The unit of measurement of current is...
Resistance.
Distance.
Amperes.
15 minutes.

32. What is the total voltage of four 9-volt batteries connected in a series?
Clean water.
8 ohms.
A counter-EMF.
36 volts.

33. The instrument used to check the electrolyte of a battery is a...
500 volts.
Hydrometer.
100 ohms
A bi-directional device that can pass current in either direction.

34. Chemical burns caused by battery acid should be washed with clean water for at least...
15 minutes.
The movement of electrons in a circuit.
Hydrogen.
Current that flows in only one direction.

35. How many kilowatts are used to develop 50 horsepower?
Wattmeter.
37.3 kilowatts
Higher current with voltage remaining the same.
Stays the same.

36. What is the rate that work is done or heat is dissipated?
Power.
Less than the resistance of either resistor.
Clean water.
Wattmeter.

37. Which of the following is a requirement of an explosion-proof enclosure?
Direct current.
Resistance.
It must prevent ignition of surrounding methane atmosphere.
In parallel.

38. The longer the conductor - the greater the...
Resistance.
Heat
746 watts.
No.4 AWG.

39. Trailing cable on DC-powered mobile haulage equipment must be at least...
Voltage.
Resistance.
4.0 ohms.
No.4 AWG.

40. What is the unit of electromotive force or electric pressure?
Voltage.
Current that flows in only one direction.
37.3 kilowatts
A counter-EMF.

41. Define current...
The movement of electrons in a circuit.
E=IR.
500 volts.
A. Total resistance is less than the smallest resistor.

42. Current in a series circuit...
Less than the resistance of either resistor.
Stays the same.
Hydrometer.
Distance.

43. Define direct current...
Reverse.
Current that flows in only one direction.
Current that flows in one direction only.
Wattmeter.

44. The minimum allowable size of trailing cable on DC-powered mobile haulage equipment is...
No.4 AWG.
After charging
Current that flows in only one direction.
Amperes.

45. What is the total resistance of four 15-ohm resistors connected in series?
48 ohms.
Current.
The movement of electrons in a circuit.
60 ohms.

46. When should water be added to a battery?
After charging
Ohmmeter.
Resistance.
Direct current.

47. What is the first step in treating a chemical burn of the eye?
Power.
Flush the burn the clean water.
Less than the resistance of either resistor.
Clean water.

48. What must be provided at underground battery charging stations?
Ventilation.
Until the victim receives medical attention.
75 volts.
Current that flows in only one direction.

49. A triac is?
Higher current with voltage remaining the same.
Clean water.
A bi-directional device that can pass current in either direction.
Current that flows in one direction only.

50. Power is measured with a...
Compound-wound and shunt-wound.
Wattmeter.
Amperes.
75 volts.

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Test your basic knowledge |

DC Theory

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3d Computer Modeling

Actionscript

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Adobe Illustrator Shortcuts

Adobe Indesign Publishing

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Adobe Photoshop CS 5 Keyboard Shortcuts

Adobe Photoshop Graphic Design

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Adobe Premiere Keyboard Shortcuts

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After Effects Keyboard Shortcuts

Agile Development

Agile Scrum Methodology

Ajax

Android Programming

Animation

Asp.net Programming