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Question 6: What are pull-in and drop-out currents for relays? Question 7: Explain the main difference between relays and contactors? Question 8: Explain the main difference between relay-based and PLC-based controllers?solve Q6,Q7 and Q8

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7) we know both relays and contactors perform the same operation and also these works under same principle.but there is a difference occurs on application point of view.

contactors are used for high voltage switching applications and relays are used for low voltage switching applications.

8) full form of PLC is programmable logic controller.In general relays are electro mechanical switches that have coil and two types of contactors that is NO& NC.But PLC is a mini computer which can take decision based on the programme and also PLC perform many functions.

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