FREE AND STUDY GAMES ABOUT MOTOR CONTROL CH 4

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FREE AND STUDY GAMES ABOUT MOTOR CONTROL CH 4

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -16 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: 1. Electromechanical devices are devices which are activated by a _____ produced by an electrical ____ in a conductor.

Answer:

magnetic field, current flow

Question 2: 4. A relay is an electromagnetically controlled ____

Answer:

switch Question 3: 10. Contacts on relays which can be configured as either normally open contacts or normally closed contactsare called ___ contacts.

Answer:

convertible No to Nc Question 4: 2. ____ convert electrical energy directly into linear mechanical motion

Answer:

solenoid

Question 5: 9. Machine tool relays have ___ contacts, but may have as many as ____ contacts.

Answer:

2,8 Question 6: 15. IEC relay coils are identified as ___ and ___. IEC contacts are identified by two numbers, the ___ number and the contact ___.

Answer:

A1, A2 , contact, type Question 7: 13. NEMA machine control relays may be rated up to __ amps, while IEC machine control relays have a maximum rating of ____ amps.

Answer:

20, 15

Question 8: 6. Describe the difference between a single-break and a double-break contact on a relay.

Answer:

a single break acts as a hinge with open and close. A double break lifts up and down to open and close.

Question 9: 14. Name two types of failures associated with control relays.

Answer:

operator failure, contact failure Question 10: 8. ___(NEMA/IEC) relays typically operate twice as long as (NEMA/IEC) relays.

Answer:

NEMA, IEC

Question 11: 12. Explain the function of a shading coil on a relay

Answer:

keeps it closed at 0 degrees p62 Question 12: 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.

Answer:

interposing

Question 13: 5. Draw the following NEMA and IEC symbols used with relays

Answer:

p 13 Question 14: 5. Draw NEMA symbol for both a normally open and a normally closed relay contact

Answer:

p 14 Question 15: 11. A ___ relay is designed to accept additional sets of contacts called add-on contacts or adder decks

Answer:

configurable

Question 16: 3. List the three parts of an AC solenoid

Answer:

frame, armature, coil, p13