Engine Operation Name



Electrical Faults Questions Name ______________________________ X362

Answer the following questions using the booklet “Electrical Faults”.

1. What are 4 types of high resistance faults?

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2. What are 2 types of low resistance faults?

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3. Describe each of the following test devices.

- jumper wire

- 12 volt test lamp

- self powered test lamp

4. Why should a jumper wire not be used to bypass an item that has resistance?

5. When using a 12 volt test lamp and doing a voltage seeking test, what is one end of the tester always connected to?

6. What special precaution should you take when doing a continuity test on a circuit?

7. List the names of the three basic test meters.

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8. Which device is better – an analog meter or a digital meter, and provide 2 reasons why.

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9. What does an ammeter measure?

10. Are ammeters connected in series (along a circuit), or parallel (across a circuit)?

11. List the 3 steps of correctly connecting an ammeter.

12. Given the ammeter readings of 3 different problem circuits, provide a possible solution.

- no current flow

- less than normal current flow

- greater than normal current flow

13. List 4 checks that can be made with a voltmeter.

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14. Are voltmeters usually connected in series (along a circuit), or parallel (across a circuit)?

15. Describe how you can test the battery source voltage.

16. What can a voltage drop test tell you about a load?

17. What does an Ohmmeter measure?

18. Are Ohmmeters connected in series (along a circuit), or parallel (across a circuit)?

19 When checking the resistance of a part is the Ohmmeter measuring in series or parallel?

20. What kind of resistance problem causes a higher and lower than normal Ohmmeter reading?

- higher - lower

21. When checking a diode (a one way electrical valve) what is indicated if the Ohmmeter reads high in one direction and very low in the other direction?

22. What does an infinite resistance reading in a circuit indicate?

CHECK POINT ________ 1.0 Hr

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