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Electrical Engineering Interview Questions

While converting delta into star or star into delta ,the three values of resistances remains unchanged .Find out the value?Let In star R1=x;r2=x;R3=x On converting into delta,R12=x;R23=x;R31=x Find the value of x

1072

if 11 lead acid batteries each 200 amph are connected in series so that combinly they can produce 110 volts dc. question is how much backup it can provide ? 2) how can we calculate that how much amprere and voltage is required to charge them . thanks in advance !

2236

toughest decision you ever had to make

2508

why neutral and earth should not be connected on 3 phase 440v/50c/s supply at consumer side. where as on 25kv/ac/50c/s railway traction substation neutral and earth will be connected and track at substation. and track will act as neutral and earth. Reasons for this is needed urgently

6268

What is effect of harmonic current (Draw by VFD) on power system/ electrical Equipments ?

1178

What is application/Function of Electro chlorinator in Offshore Oil & gas Platform ?

2285

Who many reason of ignition fail ?

1063

Why Nutral CT rating for Earth Fault Protection of Transformer neutral shall be 20% of Full load Current of Transformer

3188

what is the difference between 'Control Transformer & Potential/Voltage Transformer'?

9792

1020

Ehat is shunt motor?

4046

why do we prefer -48 volt instead of -24volt or -12 volt etc. ??

2238

suppose a fan is running with phase and neutral. if its neural is touched to body. then fan get stopped. if this fan is connected to phase and ground supply..then why it runs?

2766

In more then 1 phase bulb will glow are not?if yes then how it will glow?

2824

why characteristics of overcurrent relay is time-->psm instead of time-->current?

ABB,

1215

Un-Answered Questions { Electrical Engineering }

how to test and calculat the head and discharge in borewell compressor

1348

what happens if earth of 33kv cable is not connected to earthing pits? please send this query's answer to ngrm.sudha249@gmail.com

1179

How PSV sizing being done

1337

what is cogging and crawling

1610

What is the working principle of MIG welding? and its out put Voltage?

2326

how can i find ct ratio of meter by seeing name plate of meter and how it should be used in MF calculation if it shows only-/1???

885

what is 30-phase of transformer

1149

how to convert lv line to hv line and viseversa, any losses will occur during this process

1119

What is the principal of motor?

249

What is capacitance?

241

i need to give section engineer (electrical engineer) for RRB. Please suggest some book

1044

What are the application of filter?

259

High voltage test procedure of in swgr board. why should measure millivolt drop on testing time?

1215

What is the distance between body earthing and neutral earthing.?

2977

How to detect voltage vector shifting in interconnection protection.

1068