Answer / sheikh

This is not possible that vcb power contacts make and supply would not reach on out put. although vcb can make the contact without supply either input or out put.
vcb is a mechanically operated switch.

Answer / sheikh

VCB is a mechanically operated switch hence it may be operated without any supply either input or output.

Why different values of B’s (magnetic flux density) are chosen for DC machines and Induction Motors?

1 Answers  

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when will cause the negative sequence falut in electrical system?

2 Answers   Schneider,

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In pakistan appliances work on 220v at 50hz and in us appliances work on 110v at 60hz what is basic theory to explain it

1 Answers   SNGPL,

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please explain me about traction application?

2 Answers  

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what is the Transformer Impedence?How can calculate?

0 Answers  

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we all know that in transformer, voltage and current are inversely related i.e. Vp/Vs= Is/Ip....so in standard CT..we have a ratio of 200/5...that means our voltage should increase by ratio of 40..althoug that is not the case...because that requires high insulation level.and pratically not feasible......can anybody clarify my ques.......thanx

2 Answers  

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If a rotary UPS is in line through grid power; What would be the impact on Power Factor if the load through rotary ups is 25% , 50% , 75% & 100%. Will the power factor reduce with less load?

0 Answers  

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A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.

0 Answers  

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why i can not use thimble on capacitor duty contactor

0 Answers  

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Differentiate between ideal and non-ideal voltage sources?

0 Answers  

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What is the relay function?

2 Answers  

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can induction motor becomes as a generator. if yes how it is possible. if there is a squirrel cage rotor.

6 Answers  

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