Motor Control ch 4 Word Scramble

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Question	Answer
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