What is PLC ? What it does ? What are its components ?
When & where we use PLC & How ?
What are its Pros & Cons over other things ?
What are the main faults that occur in it ?
What are other devices that are similar to it and how we
can compare them all ?
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Why 440 volts instead of 660 volts in 3 phases of supply system?
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Define pulse width modulation?