1. The recommended repair for a defective relay is to Replace it. 2. What components can be changed on a contactor and a starter for rebuilding purposes? The parts that can be replaced on a contactor are the contacts, the holding coil, and the contact ho

9. What is not a typical operating voltage used for relays, contactors, and motor starters?

12 V.

5. What is the difference between a contactor and a starter?

A starter has overload protection devices, while a contactor doesn't.

8. What causes an overload protection device to function?

An overload protection device will disconnect the motor at some current draw value that is slightly more than the FLA value so that the motor can be operated at it's fill-load design capacity.

4. The two amperages that influence the choice for replacing a motor starter are

FLA and LRA.

15. A motor can be restarted immediately after it has stopped or been overloaded.

False.

6. A contactor can always be converted to a starter.

False.

10. Why is it not a good idea to file or sand the contactor contacts?

Filing or sanding exposes the base metals under the silver plating and speeds deterioration.

13. Describe the difference between inherent and external motor protection.

Inherent motor overload protection is provided by sensing devices within the motor and external overload protection is applied to the current passing device, the relay, the contactor, or the starter.

3. The two types of relays are

Light duty and Heavy duty.

1. The recommended repair for a defective relay is to

Replace it.

7. What are the contact surfaces of relays contactors, and starters made of?

Silver. (Alloys)

2. What components can be changed on a contactor and a starter for rebuilding purposes?

The parts that can be replaced on a contactor are the contacts, the holding coil, and the contact holding springs. The components of a starter that may be replaced are the contacts , the springs, the coil, and the overload protection devices.

14. What is the purpose of overload protection at the motor?

To prevent the motor from overheating and damaging itself.

12. Under what conditions are motors allowed to operate with slightly higher-than-design loads?

The motor can operate above the FLA and within the service factor without harm, for a limited time.

11. Why is it not a good idea to use circuit protection devices to protect large motors from overload conditions?

The motor may be operating at an overload condition that may not cause the conductor to be overloaded.