why we are using DC supply in megger?

3 Answers   TATA,

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In DC while we mention the voltage we are using -48V but in case of AC we mention only 230V not -230V, why we using -48V not 48V

2 Answers  

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What is the principle of residual protection?

0 Answers  

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We have two Al.busbars each of size 125mm*10 mm connected in parallel.To increase the current rating ,can we connect third busbar of size 100mm*10mm in parallel to existing two busbars?In my opinion ,if we connect busbars of different sizes in parallel,then the busbar of lowest size will take much current.So this type of paralleling should be avoided .Am I correct?

1 Answers   PDP Steel,

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is there any phase difference occurs while primary and secondary side mutual induction occurs?

0 Answers  

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Which is the oldest hydropower plant in india?

0 Answers  

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Why a dc generator gives result during two different condition,- 1)separately exited gen.- Eg=110 V, field current=0.25 A. 2) self exited gen.- Eg=30 V, field current=0.025 A.

1 Answers  

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Why current leads the voltage in case of capacitor load? Why voltage leads the current in case of inductive load? Why both are with in phase in case of restive load?

3 Answers   TATA,

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What is basic fundamental for choosing NGR or NGT for any generator neutral grounding

5 Answers   EDF,

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If increased the frequency up to 1000 then what changes shows in voltage?

0 Answers  

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a power supply to be constructed from voltage cells is required to provide Max. 20A Current with a terminal voltage of 6v.Several voltage cells are available each of which has terminal voltage of 1.5V & each of which can supply a max current of 5A .the no of cells required will be ??

5 Answers  

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what is meant by VDC ?where its applicable ?

2 Answers  

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