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1. Electromechanical devices are devices which are activated by a _____ produced by an electrical ____ in a conductor.
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2. ____ convert electrical energy directly into linear mechanical motion
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Motor Control ch 4

Magnetic Control Relays

QuestionAnswer
1. Electromechanical devices are devices which are activated by a _____ produced by an electrical ____ in a conductor. magnetic field, current flow
2. ____ convert electrical energy directly into linear mechanical motion solenoid
3. List the three parts of an AC solenoid frame, armature, coil, p13
4. A relay is an electromagnetically controlled ____ switch
5. Draw the following NEMA and IEC symbols used with relays p 13
5. Draw NEMA symbol for both a normally open and a normally closed relay contact p 14
6. Describe the difference between a single-break and a double-break contact on a relay. a single break acts as a hinge with open and close. A double break lifts up and down to open and close.
7. The term___ relay is rused to describe a relay which enables the energy in a high-powered circuit to be switched by the low-power circuit in a control system. interposing
8. ___(NEMA/IEC) relays typically operate twice as long as (NEMA/IEC) relays. NEMA, IEC
9. Machine tool relays have ___ contacts, but may have as many as ____ contacts. 2,8
10. Contacts on relays which can be configured as either normally open contacts or normally closed contactsare called ___ contacts. convertible No to Nc
11. A ___ relay is designed to accept additional sets of contacts called add-on contacts or adder decks configurable
12. Explain the function of a shading coil on a relay keeps it closed at 0 degrees p62
13. NEMA machine control relays may be rated up to __ amps, while IEC machine control relays have a maximum rating of ____ amps. 20, 15
14. Name two types of failures associated with control relays. operator failure, contact failure
15. IEC relay coils are identified as ___ and ___. IEC contacts are identified by two numbers, the ___ number and the contact ___. A1, A2 , contact, type
Created by: JoshHampton
 

 



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