What is the deffrence between Siemens S7-300 & S7-400 PLC?

4 Answers   ADC,

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What is the difference between earthed and unearthed power cable.

1 Answers  

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how external lighting design? please give examples?

0 Answers  

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What is LCI drive & how does it work & why it is used?

1 Answers   EIS, ONGC,

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can we measure +,-.zero sequence current ....? if so how can ???

2 Answers   NLC,

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Factory acceptance test. FAT. For 132 kv transmisstion towers what is that meaning and what are the tests commonly companies perform now days.

0 Answers   PKR,

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can any one list the class-a, class-b & class-c trips of power generator?

3 Answers  

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How to increase the specific gravity of DG batteries?

5 Answers   SCS,

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In transformer which temp should be less oil temp are winding temp?

7 Answers   TCS,

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Generation of voltage for each phase are same of a turbogenerator.Although the short circuit current flow when two phase of turbogenerator are shorted(where current can't flow without potential difference),why?

0 Answers  

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i have three phase 25kva transformer but there is two phase line how can i connect to the two phase line?

2 Answers  

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prove that inegration of { e^z / z^2 + pi^2 }dz is equal to i/pi by Cauchy Residue Theorem.

1 Answers  

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