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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what does mean of RCT and STR in diffrential CT?


what is the resistance value of earthing pit and why they are connected?

6 11900

what is the meaning of insulation level?

2 4628

what is the function of RMU?

4 14054

What's the part of OTCC in transformer?

Bhel, RRB,

7 18414

why ac can not be stored?

5 5795

how we can calculate power factor in single phase & three phase ?thank u


what is the working principle of tube light?

2 3341

what is the working principle of ceiling fan and table fan?

ABC, Tata Steel Limited,

10 41400

why we can stote dc? why we cant store ac?


what is a tri vector meter? what are the tri vectors?

2 4505

why we cannot apply ohms law to transformer?

3 4423

working of bulb?

1 2667

what is per unit impedance?

3 9815

why overload relay is not tripped at time of starting of motor allthough staring current is too high?


5 7430

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Un-Answered Questions { Electrical Engineering }

we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.


model question paper for supervisor trainee


Can anyone tell the proper diagram of star delta starter????


What is Icu and Ics and what is difference b/w them. please tell me how to calculate a size of a copper bar for a system or a breaker... reply on... would be waiting for a logical answer.


What are the basic properties of signal flow graph?


what is the illumination level required for child play area?


When distance between two pulleys is not fixed, the tension of belt is adjusted by a) driver shaft b) driven shaft c) adjustment screw d) belt


Define what is the function of anti-pumping in circuit breaker?


how to define tell me about self


What is the difference between grid and off- grid system??


How to set the relay,,??


HOW TO DESIGN THE body EARTH cable(Copper Conductor) size for 60KVA UPS?


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?


How to calculate no of EARTH PIT? Describe the formula as per IS standard?


Explain using drawings what is reverse PID action w.r.t PID controllers.