Answer Posted / thowsif_emerson_csm team

For Motors:-
http://www.pacontrol.com/download/Tutorial-
Motor-Basics-Lecture.pdf

For Transformers:-

http://www.federalpacific.com/university/transbasics/transba
sics.html

For Generators:-
http://www.federalpacific.com/university/transbasics/transba
sics.html

What do you mean by passive circuit elements and why these are called passive?

756

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generally in LT and MV motors we are using 3.5Coresx16,25,35,50 etc cable for supply.although motors is earthed at two point and having all protection.then why we are using that 1/2 core for earthing the motors.while in HT cable we are using only 3core cable for motor supply.generally lt and mv motors are delta connected and ht motors having star connection.whethere it is having any relation with winding connection( star or delta).all motors i am talking about are dol only.can anybody solve my confusion.thanks...

1629

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What is the formulae of Megger value for a A.C.Motor

2390

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how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?

1487

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High voltage test procedure of in swgr board. why should measure millivolt drop on testing time?

1720

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What is difference between unity power factor wattmeter and upper power factor wattmeter? In short circuit test of transformer the wattmeter used is unity power factor type or upper power factor type wattmeter?

2394

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hi friends ,iam working as genset AVR service engineer in electrical field from past 2 yrs throughout india . i plan to shift in some other job without travelling in same field because i con't travel,i dont know what i do for that so please guide me what job is suited for me,how i can serch the job please anybody helpme iam totally confused

1650

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Advantage of LT panel vs HT panel

2440

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How is efficiency of DG set calculated? At many places I found the efficiency to be mentioned in percentage. But at some other places I found kWH/ litres. I want to know how dimensionless percentage value is arrived at?

1518

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sourse is 66 KV / 350 MVA, transfarmer is 1000 KVA 6.6 / 0.415 kv, iF fault is 28.75 MVA on 0.415 KV Bus then calculat the Transfarmer Impidance

1762

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why ht motors are star connected?

1516

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What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works?

1605

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what happen if field of dc shunt motor opens? what is function of putting res. in parallel to one phase of 3 phase IM? the power supplied by 5A source in circuit is given by------Watt.

1637

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how will calculate the safe starting current of 3-phase squirrel cage induction motor?

1540

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I am going to appear for the RRB Chennai Section Engineer online exam. Please send me the question papers from 2001 to date to my mail id:upendrakrishna20@gmail.com,plz send me ,or send any other rrb papers plzzzzzzzzzzzzzzzzzz

1715

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