Why a Permanent Magnet Generator has higher frequency as compared to frequency of main alternator?

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Please sent me some previous year question papers of BSNL-JTO telecom and RRB in ELectrical Engineering to varshashahi@yahoo.com

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why transmission is done in delta system

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what is zero sequence curr ent ?

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1> what r different types of fault in cables? How will u locate and test these faults? 2> why earth wire is provided on top throughout the transmission line. why not only on towers? How much area it can protect? 3> what r different types of transmission losses? How power loss can be minimized? 4> what is the % of power loss on transmission lines?

3 Answers   IOCL,

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if dc motor can operate by ac supply ? if its possible means how ?

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describe the fully control circuit diagram of ac drives

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for opening electrical shop, tips needed.

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what is solkor relay and which condition it will act?

0 Answers   Equate, TCS,

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What is the function of automatic Transfer Switch(ATS) in details

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Three set (each phase contain 2 cable of 400 mmsq CU XLPE AWA) of single core cables are connected to 11 KV motor of 14 MW & the switch gear supplay is taken from 11kv feeder & this supplay taken from 275 KV substation. Problem is one pair cable(L3- 2 cable ) getting very hot & gland melted and damaged in switch gear side. the other two cable haven't any more hot(ambient temp only & L3 haveing 95- 100 Degree C. The same problem happened in 275 KV substation switch gear side also where the supply taken for 11 kv switch gear. But here L2 phese cable had problem. Why it is happening like this?. The cable having temperature different at different location from gland side inthe case of 11KV feeder of 275 kv substation. why ?

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Which factor decide the colour of the light emitted from a Led?

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