Answer / sukhvinder

excitation means energiseing of rotor field by external dc
supply.

in lab almost both dc and ac are used.

Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient?

3 Answers  

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Why does The speed of motor used in elevator remain constant irrespective of load??

1 Answers  

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why is that a 4*4mm cable,is always powdered internally

3 Answers   Construction, L&T,

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2 Answers   Areva,

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In supply RYB are mentioned. But in transformers, why they are mentioning XYZ?

3 Answers  

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140 is load amps for a equipments and what ratio of CT requied for installimg ammeter to amps montering purpose?

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how to use single phase supply for a three phase equipement.

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1 Answers   S V Sugar,

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wow to calculate the transformer rating(KVA)

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Alternating voltage and current is which type of quantities?

1 Answers  

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In iduction motors the current is higher than normal for both the cases when the voltage appllied is more than the rated as well as less than the rated, why?

2 Answers  

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