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Electrical Engineering Interview Questions

When measuring the Insulation resistance of a motor winding (winding to earth) using a megger meter, Applied voltage(1000V) was automatically reduced to 500V. and the measured insulation resistance values are also very low (in Kohm range) Can anyone give me a reason???

4918

How to Calculate Contracted Maximum demand using motor Hp or Current

12208

typical per KM resistance values of ACSR DOG conductor for 33KV & 11KV OH system? typical per KM resistance values of XLPE 300Sq mm cable for 33KV system? typical per KM resistance values of XLPE 185Sq mm cable for 11KV system?

17548

for 11KV OH system what will be typical per KM "R" "L" "C" parameter. for 33KV OH system what will be typical per KM "R" "L" "C" parameter. for 33KV UG system what will be typical per KM "R" "L" "C" parameter.

1407

If genrator not build up voltage , How u can Manually Excite ?

3131

how to caculate no load loss, load losses & impedance percentage in power or distribution transformers

3650

anyone please send transformer parameter design formulas & details of tap changer ? plz i have interview this week its more helpful for me ?

1049

I have a relay contact rated at 220v dc which is supplied with a 24vdc from the panel,for it to trip the dampers(24vdc).What if the application of the relay changes so that it should work at its rated 220vdc then will it work at 24vdc supply given or any other consideration needs to be taken .....

1248

2693

2672

how to determine Sq.mm size of finolex power cables.

1149

A resistance, inductance & capacitance are connected in series between points A & B.The voltage drops across the resistance,inductance&capacitance are found to be 40V,70V&100V respectively. What is the total voltage between between points A&B (Vab)? a)210V b)70V c)50V d)230V

4929

1- What is the Polarization Index number be good for 15KV 3c#500MCM electrical cable? 2- Can I use the IEEE Std 43-2000 to perfom the PI test? Thanks

2449

what is the working principle of UPS?

4333

how to calculate the cable size depending on the amps?

2300

Un-Answered Questions { Electrical Engineering }

block diagram of 2 ups system connected in parallel mode?

1195

Why line VTG = √3 phase VTG in star? How?

752

What is phase cross over frequency?

248

define the non synchoronism of synchoronous machine in general g or m??

1120

Why the cores of large transformers build up of circular cross section?

1171

What is difference between YNyn0 and YNyn ??

1284

Draw a SLD of HT distribution EB grid up to users Transformer?

5153

Why does the Solid state Rectifiers for 3-ph brake motors sometimes have 2 & sometimes 3 output terminals?

1113

what are inductive and capacitive voltage transformers.what are their applications

1108

how invertor convert the dc into ac give brif detail

1147

Please give me a erda placement paper

868

what is difference between isolation and ultra isolation transformer?, what is the method of testing ?

3377

Can an inverter be used as a converter? How?

1096

Difference between Earthing Truck & Earthing trolly for HT panel

3272

design of IGBT firing circuit for 11KV

1685