Activities Manual For Programmable Logic Controllers
Activities Manual For Programmable Logic Controllers
5th Edition
ISBN: 9781259682476
Author: Frank Petruzella
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 6, Problem 3RQ

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Rating control relay coils and contacts:

  • Both, control relay coils and contacts have their own unique rating.
  • The rating of control relay coils is based on the type of operating current such as AC or DC current and normal operating voltage.
  • For safe operations, the typical value of normal operating voltage for the coil is 120 VAC...

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The following table shows the timestamp and actions by two users. Choose the best option that describes the outcome of the actions. Time JohnSara 10:14 select* from hr.employees; 10:15 Update hr.employees set salary= 100  where employee_id= 206; 10:16 Commit:  Select* from hr.employees; 10:18 Commit: 10:20 Select* from hr.employees;  Commit:   John's query willreturn the same results all three times it is executed as they are run in the same session.   John's queries run at10:16 and10:20 produce the same result, which is different from the one at 10:14   John's query run at 10:16 waits until 10:18 to produce results, waiting for the commit to happen.   John's queries run at 10:14 and 10:16 produce the same result, which is different from the one at 10:20
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