Electrical Engineering Interview Questions

how to design coil turns ?

L&T,

1493

how to calculate magnetic force genrated by a coil ?

L&T,

1676

what is method of dc current measurement

7872

How much energy save vfd if motor run on 50 Hz (full speed)

4314

How to Decide(calculate) Bush bar size for copper and aluminiam ?

1654

why knee point voltage should be high in Ct for differential protection

NTPC,

4855

what are the difference between protection class CT and Class PS CT

29660

WHAT IS DC COMPONENT IN CIRCUIT BREAKER?

21547

How to calculate HT XLPE CABLE for 11 kv / 433 v , 1500 kva oil type transformer system? plz provide step by step calculation

123992

Hi friends. m 3 years drop. now d company asks in d interview d reason 4 my drop.what shud b d probable answers 4 that which may not put a negative impression.

3843

why we use star connection on the primary side of a transformer?

DRDO, TCE,

15885

what is meant by a slip?

12231

why transformer is conneted to dc for polarity test.it doesnt work in dc?

ABB, KVPY,

6411

What differance between Circuit brekar and Isolater?

TATA,

18918

WHY HUMMING SOUND OCCURED IN HT TRANSMMISSION LINES?

9567

Un-Answered Questions { Electrical Engineering }

Is there chopping current in resistive circuit

1504

What is effect of over voltage and under voltage on ACB

1369

Why is the frequency not changed during transformation of electrical energy in a transformer?

794

Explain difference between stand by earth fault and residual earth fault protection?

1497

We have 750KVA DG set, we want to introduce REF relay with 1250/1A,CL PS,Current transformers.The lead distance of 2.5mm copper flexible cable from CT to relay is around 5mtrs.We would like to know the knee point votage(VK) & IM calculion for CT's

1406

how ct burden,magnetising current,ratio and knee point voltage are related & derived

1716

what is method for testing CT

1575

In between UPS out going changer over switch and ups raising main input, both side cable gland producing heat but the cable doesn't get heat,Why?

1681

A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram

2327

WHY BLADE & JOW OF ISOLETOR IN SUBSTATION?

3772

can anyone send me some sample question regarding power grid corp

1760

hi friends if you have any 400KV Substation Erection and installations Drgs please send to me.My email id:kandi.suresh441@gmail.com

2340

How to discuss the phase shift of transformer considering open delta?

940

what will happens if one phase is missing for 33/11kv power transfomer and why?

2140

can i use the six sigma method which is used in management area, in state estimation of power systems?

1340