Electrical Engineering Interview Questions
Questions Answers Views Company eMail

for distribution line ratio of x/r 1.<0.1 2.>10 3.>1 4.<0.01

HAL, HPPSC,

3 15003

why any inductive load need free wheeling diode?

Essar,

4 5200

how to decide choke rating for drive?

Reliance,

1065




DIFFERENCE BETWEEN NORMAL TRAFO AND THRISTER TRAFO?

MahaGenco, Essar,

1062

IN bateery size of positive is biger than negative .why?

Power Grid,

8 6588

what happen when ac motor is connected with dc current

4 4630

what is the difference between inrush curent and jurk load.

2 5278

what is the pi test for current transformer?

1 6100




wat is the difference between real power and reactive power..which is useful..?and how it s useful..wat is the effect of these on a power system...

ABB,

10 16651

why AC signals are represented by sinusoidal waveform?WHY other waveforms not used for representation

4 5040

What is ONAN/ONAF1/ONAF2 for transformer cooling

5 48322

In tranformer winding Connection Like Dyn1 ,so LV lags Hv by 30 deg and Dyn11 LV lead HV by 30,so how do this lagging and leading afffect the transformer??

Siemens,

2 3823

what is the use of Antipumping in HT breakers.

9 17718

like the transformer another electrical static device which operate on same priencipal?

Power Grid, Vishal Transformers,

13 10464

Differance between ELCB and RCCB?

8 8076


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Un-Answered Questions { Electrical Engineering }

what is tri state logic gate

782


how u measure/calculate renge of capacitor,capacitor has no any rating tag.what is the theory of measure of capacitons.

756


33kv Rated output avilable in market (any where in india)

893


why we use Test Terminal Block in 11 KV and 33 KV electrical panels.

244


if the number of poles generated in stator and rotor side of an induction motor are different then what will happen and why?

602






What is Harmonics how it is produced and what is the method to control the same

1032


What is power distribution criteria for converting single phase unbalanced residential load to 3 phase star connected balance system. Does total KW converted to 3 Phase. Means Divided by root 3.

876


I want to know all basics of electrical engineering

584


What is meant by time harmonics and space harmonics?

1415


how to operate and maintenance of 1500 kva diesel generator set

389


why use phase displacement in transformer.and effect of phase displacement on transformer

1557


What is the Good Earth resistance value of G.I & Cu. Chemical Earthing & Normal Pipe Earthing?

1001


how to calculate the loss tangent of electrical cables

810


Can I use star delta connected induction motor for dual supply voltage?

777


Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1.  H1-H2 = H2-H3 H3-H1 2.  H2-H3 = H3-H1 H1-H2 3.  H3-H1 = H1-H2 H2-H3 For the LV side also: 4.  X1-X0 = X2-X0 X3-X0 5.  X2-X0 = X3-X0 X1-X0 6.  X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0  H2-H0  H3-H0    X0-X1  X0-X2  X0-X3 128.0  119.9  7.2      29.2   13.3   15.8 70.7   128.4  59.2     23.4   22.0   3.6 7.2    120.1  128.1    13.4   29.3   15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?

586