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Electrical Engineering Interview Questions

what does mean of RCT and STR in diffrential CT?

3283

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

11900

what is the meaning of insulation level?

4628

what is the function of RMU?

14054

What's the part of OTCC in transformer?

Bhel, RRB,

18414

why ac can not be stored?

5795

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

1122

what is the working principle of tube light?

3341

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

41400

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

1141

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

4505

why we cannot apply ohms law to transformer?

4423

working of bulb?

2667

what is per unit impedance?

9815

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

TATA,

7430

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.

1009

model question paper for supervisor trainee

1084

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

1001

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... king.arish@gmail.com would be waiting for a logical answer.

1428

What are the basic properties of signal flow graph?

198

what is the illumination level required for child play area?

1165

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

1041

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

160

how to define tell me about self

1034

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

966

How to set the relay,,??

1170

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

1052

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?

886

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

2705

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

2191