what is data block in plc ? How the values of data block are written and read by hmi ? what is the difference between function and function block ?

0 Answers  

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define bilateral network and unilateral network? give an example.

3 Answers   ABB,

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I have tow 200 KVA UPS, both are in parallel mode.My question is that, both are running on battery when power fail, if one of them fail (Eg rectifire fails or some other reason), at thet time reverse power will come to faild ups if it comes then it will harm to failed ups or not? if not then how it protects to faied ups????????????????

1 Answers  

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What is routh hurwitz stability criterion?

0 Answers  

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how can we change the supply voltage?

4 Answers   Areva,

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How can you calculate in detail the VA burden of current transformer used for Restricted earth fault protection? Please understand that the CT required here is Class PX or X. Also please show the calculations for knee point vtg, stabilizing resistor, magnetising current.

3 Answers  

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if the 10 hp motor name plate indicates rated current as 13.6 amp the what will be the thermal relay setting? Why? And in how much time relay will trip at the set value?

2 Answers  

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Starting times for soft starter & power factor is thier any standard or datas available in manufactures list. Kindly suggest.

0 Answers  

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explain the Trip supervision circuit

0 Answers   NCC,

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what is softstarter?

2 Answers  

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1.Why hydrogen used for cooling in generators 2.Why electrical equipment protected by ground 3.Why earthing for transmission line 4.What is rms value of half wave rectified square wave. If Rms value of actual wave 2amps.

1 Answers   Power Grid,

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Draw a SLD of DG distribution up to main LT panel?

0 Answers   HSL, TATA,

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