Exam questions

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igor2008

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I failed the exam recently. :mad: There are some questions confused me. Who can give the right answer? I will greatly appreciate any help here.
Thanks a lot.

Q1:
A single phase circuit with PT:600/120, CT:50/1,voltmeter reading is 112.5V, and ammeter reading is 3A, PF=90%,what is the wattmeter reading?
Q2:
A high pressure sodium lamp has long delay to restart, how to repair?
Q3:
What do you use to ground a PLC?
Q4:
What is the tool to check a DCS?
Q5:
After moving a DC Welder from one place to the other, it does not work, why?
 
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