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| 4. Why must protective relays be coordinated with other protective devices? Name several of these protective devices. |

| 5. What is meant by pilot protection? Name three means of accomplishing it. What are its advantages and disadvantages? |

| 6. What is a ground relay and how does it function? |

| 7. What two characteristics of protective relays determine their performance? |

| 8. Name five important items that should be checked on inspections. |

| 9. What kinds of relay contacts are there? What features are to be considered and what precautions should be taken in their maintenance? |

| 10. How are protective relays tested? |

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