Answer Posted / pillay

You need a magnetic field to produce electrical energy.This
can be produced from electro magnetic means . What if during
a power failure when the DG set usage is most wanted and the
electrical source from a battery is also not available say
due to battery failure or discharged battery.To avoid such
situation a permanent magnet is used instead for initial
excitation.

full form of electrical?

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How to calculate energy stored in a capacitance

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How to use earthing on shipments.

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what kvrah y we need to take the readind of that

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List advantges of active filter over passive filter?

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what is meant by brushed alternator & its working principle ?

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What is the difference between DOL starter and star delta starter

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plz send me the placement interview question and answers of whizchip(technical and apttitude)..i have an interview in next.

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armature winding of dc machine produce alternating emf then it convert in to dc by using commutator.But only we consider armature resistance why don't we consider inductive reactane effect?

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how to calculate the no load current in transformer?

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when we design electrical schemes of 11/.415kv distribution..wen and were should we show the relays??what is the function of it?for example..we place EFR Relay CT between transformer neutral link and transformer earth.Like this what are the other type of relays we should use?why?where?Explain please..Thank you

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what does a string of resistors in a series will do?

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If I bring a basic electric meter from the States and hook it up in Costa Rica in a development that has only one transformer for the 50 homes, will it still be accurate regarding the usage of kilowatt hours?

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what happen when increase or decrease size of lamp,light.glass.

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