Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Uses of induction motor

NTPC,

6 29009

I want Primary side delta and Sec side Star connection transformer . but i have received Star - Star transformer ,shall i use the same transformer by giving the only 3 ph on Primary side without Neutral connection on the Starpoint.

5 9400

Why current flows in nutral? As per theory there should be no current in 3 ph explain.

Bhel,

11 16925

What is the difference between phase current & line current, how both can be measured in star and delta system

Doshion, MIT,

9 80578

Difference between ups

Emerson, Tata Power,

32 89660

What is the formula for finding fault level of generator?

11 34916

I am mechanical engineer,I need Training in Electrical & Electronics ( i.e. three days workshop training ) Where will I get the same Please suggest?

2 3811

can you send me the placement papers of electrical engg. from companis like NTPC,DRDO,IOCL,HPCL,BPCL etc.?If,plz send as soon as possible.Thanks.

NTPC,

1655

What will be the average KVA rating of Auto Transformer for 75kw 415V , 3phase induction motor

2 5217

If the capacitor bank is installed in switchyard say 132/22kv then on LT side say 22kv/0.433kv is it necessary to install capacitor bank for maintaining power factor. if pf is maintained on HT side then will that be maintained on LT side as well.if not then how&why??????/ please explain...........

MacLellan,

3 10166

what is relation between vector group of transformer and its load hormonics?

Sanmar,

1 3584

What are all present producing cost of Per KWH of various Fuel?

Sanmar,

2090

Why the generator rating in kva

CompuCom, DLF, Genpact, HNG, SIPM,

32 98082

Please nybody say, weather the result of Bharat Oman is declared or not? Probable date of declare???????

1514

wat s the difference between diode and capacitor

TCS,

20 24824


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Un-Answered Questions { Electrical Engineering }

How to determine alternating current frequency?

665


A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.

1321


Draw a circuit diagram in which if button is open we can use socket and bulb as a series test circit and if button is close than simple we can use socket as any load purpose.

1414


Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

1500


why the difference arise between HT reading & LT reading (submeters fixed in complexes, apartments etc)if the power factos exceed from 0.9 to 1 can the ht meter reads fast?

2158






what is mean by D.O. in distribution line poles?

1036


I Want randstand placement papers

1334


I have a situation to design sub-Distribution board/Panel meant for feeding power sockets. In the incomer CAN i Take TP MCCB with Neutral Link and All the outgoing feeders with to sockets with TP MCCB and Neutral Link? P.S : My System is IT Earthing

1287


Please tell me the formulaes while designing a substation for power Calculations in designing a 33 KV Substation?????

1355


why the neutral line is not giving shock to us if we touch it ?

1308


how to caculate cable size for diff types of loads? if anyone know the calculating procedure please tell me

937


There are Two questions about Steam Turbine Generator... What is HRSG bypass of LP, HP used for in power generation? In particualar, in the event that fault of HP bypass, there would be STG TRIP in operation but none on the LP bypass fault...what's the reason ?

1785


Draw the equivalent circuit of crystal oscillator?

733


Terminal blocks is used for segregate the connections... There is any principle for terminal block..?

1655


Explain the process of commutation in a dc machine.

581