Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what will happen if any motor runs long time with star connection in400vA.C. system

5 9343

What will be the effect of in HT XLPE 220 KV cable when one side of the Armour/cable ends are not grounded. Will there is difference between 3-phase voltages? like: if A. Both End of Cable grounded Phase Voltages:- V1=219 KV, v2=220 Kv, v3=220 KV. B. One End is grounded other is not: than Impact on Phase Voltages:- V1= KV, v2= Kv, v3= KV. Remain same or unchanged??

Jamshoro,

3 4502

What is meant by cold loop test in instrument

Transnet,

2093

what is the diffference between 3 point and 4 point starter ?

3 5122

Baud rate is used to descrice...?

2 3380

why write 500v on line tester (Test pen)

3 4456

why in the three pin plug all 3 pins are cutted ?

1501

For some transformers we are using solid neutral earthing while some others we are using resistance earthing why ?

1441

If you touch at the end welding machine, will you have shock ?

1 2986

What is the purpose of stand by earth fault protection for transformer ?

1526

what is the need to express current and voltage in rms value? rms value is also called as effective value,what is effective value?

Bhel,

1457

what is power factor ? why is it so important?

Telco,

2 5856

what is reactive power?

Vestas,

2 3863

Is 2000kva stabilizer suitable for 1h.p split air conditional

2 3241

what is the usage of microcontroller in the panel board?

1520


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Un-Answered Questions { Electrical Engineering }

What will be the size of copper cable (each for 3 phase and 1 neutral) from Service connection Kit-Kat to Panel Board (i.e. to main switch) for a 6 pole 3-phase AC induction motor of 200 H.P. capacity? Amp-255 A, Frequency:- 1450 rpm.

1478


In control room of our one plant there is a continuously the incoming power goes to PC is vary,means in stabilizer it continuously indicate from high input to low and low input to high. what is the reason and its solution.

1473


how to calculate distance between busbar supporters for LT panel, what are the factors influencing in this design

4675


what are your career plans upon completion of the programme and the relevance of recity generation to your professional development?

1732


Thumb rule of cable size(rm>30 rm)X multiplying factor=ampere

1157






How to convert a two phase power into a three phase power in induction machine?

1330


What are the three major categories of error?

629


i applied for the ap transco please forward the freqventley asked QA

1520


what does vector group Dyn11 tell us? also tell me how will u differentiate between phase lead and phase lag thru this vector group

1589


What is instrumental error?

664


How much costly in percentage wise is sandwich busduct costly than air insulated busduct of any rating?

1329


how can i change the rotation of the AC single phase induction motor and show me by diagram

1283


How calculated single phase induction motor req. Capacitor?

1098


1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?

1740


Which type of questions well asked. ?

1271