Why is it that variation allowed in supply voltage to motors is (+ or -)10 %, whereas that in frequency is (+ or - )5 %

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what is the difference between potential Transformers and capacitive voltage transfoemers and where it is used?

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How can I calculate the trnaformer effciency at different loading condition?

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2. The heaviest and lightest strings on a certain violin have linear densities of 3.0 and 0.29 g/m. What is the ratio of the diameter of the heaviest string to that of the lightest string, assuming that the strings are of the same material?

1 Answers  

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

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how does a tube light starter works?

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What is core CT & it's function?

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what is VFD and how to save the power by using VFD?

7 Answers  

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how to put cable sizing and cable glands size for respective cable & Cable Lug size in a DB sectors???

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What is meant by full pitched winding?

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how to calculate the lightning arrester conductor @ no of earth pits required

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which of the following can produce maximum induced voltage..... (a)1amp dc current (b)50amp dc current (c) 1amp 60 cycle ac current (d)1amp 490 cycle ac current.

2 Answers  

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