What is the difference between online ups and offline ups?

44 Answers   Electrical Tech, GMR, Gravity India, HCL, Indus Towers, NIT, Pyramid, Techno Electric and Engineering, UBS,

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Am using an electronic digital display to see the RPM of ABB ACS 550 drive, which is showing negative value when the motor & drive in stop mode but it is showing correct value during the run mode. can anyone help me out??

2 Answers   Bala Power Solutions,

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How to calculate the motor winding resistance ?

21 Answers   Forbis, L&T, OEGI, VTI,

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how much capacity(rating) of generator required to operate a load of 100kv.

6 Answers   DSC,

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what is the difference between surge arrestor and lightning arrestor ?

6 Answers  

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why cant we use earth as neutral at home whereas neutral is actually grounded at transformer end?

4 Answers  

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DIFFERENCE B/W NEUTRAL AND EARTH?

2 Answers   Genesis, IBC,

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what is per unit impedance?

3 Answers  

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I want formula to calculate cable size as per load given in kw & amp.I searched many sites but didn't right answer.Plz reply me asap.

41 Answers   Armco, BEL, BGS, Biocon, BRB Cable, Crystalline Chemical Industries, DLF, Doshion, Electrical, Gold Roof, L&T, Lanco, MEIL, Oman Cables Industry SAOG, PK Services, Polycab, Sabic, SLV, System Electrical, Tata Motors, UEM, UMIC, Vega, Vertex, Voltas,

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How to improve fuel cell in a distribution system?

0 Answers  

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why indicated sypply only by 440V in 3-phase system.

2 Answers  

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hai iam arunkumar. i have applied for an section enginner in rrb. i want lat 5 years solved question papers. if u have please sedn it to arun30682@gmail.com

0 Answers   RRB,

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