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Electrical Engineering Interview Questions
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When VFD is connected to a 3 phase main supply there is load current difference between incomer to VFD and outgoing from VFD.

Shasun Chemicals,

1 4787

What is the implications when 600 hp motor is started when the unit is running with Transformer of capacity 1500 KVA and DG set of 1000kva

Shasun Chemicals,

1732

two way ckt diagram can be drawn by how many ways? give diagram

 1333

AVR is used for the Voltage regulation of the Generator using the feedback signal by exciting the field winding of the generator.But how the field winding will be excited & using what?

Alstom,

2 4912

i need of the bhel question papers along with answers and also give some website names for the downloading question (electrical and electronics engg question)please help me....

 1492

neutral,ground & earth different b/w

 2 4440

can we use 400w coke instead of 250w choke in 250w fittings

 2 4241

If a fan get trip and run in reverse direction due to system flow. Now in this condition during starting how can a VFD bring this negative speed to zero and later run in forward direction?

Aditya Birla, Siemens,

2 5060

I have a transformer whose primary operates at 230V, 50Hz for which the secondary voltage will be 12V, 50Hz. What will be the secondary voltage if the primary is fed with 400V, 8KHZ Signal?

ABB,

6 8297

what are the maximum available current, voltage ratings and switching speeds of the power electronic devices thyristor, power mosfet, igbt, and mct?

 1665

in india ac frequency is 50hz, but in foreign countries it is 60hz,whwt is the reason

SVIT,

9 14781

why neutral should connect to earth in delta-star type transformer

 4 7947

Why TAP changer provided in primary side of HT transformer ? and why not in secondary?

ABB, Reliance,

9 46376

why solinoid coil used in tripping rely?and why not other type coil?

 1 2270

How to use a insulation resistance tester on a three phase electric motor?

2 5528

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Un-Answered Questions { Electrical Engineering }

I want to replace the 3 KW DC motor with AC motor so what should be the rating of AC motor? Details Of DC motor to be changed with AC are - Kw - 3, Vf - 310, If - 0.15, Va - 400, Ia - 13, RPM - 2400

1404

Alternator rotor earth fault relay circuit

1547

What is the de rating factor of cable? What is the importance of the de rating factor in cable selection?

1617

What do you mean by dependent and independent voltage sources?

596

please give me solution to rectify the emi(electromagnetic interference)

1434




How to calculate cable size by using load.?? Any formula...

895

What are the advantage of free wheeling diode in a full wave rectifier?

638

why does connected a indutor with mnsformeretering core of current transformer ?

1633

What is effect of over voltage and under voltage on ACB

1392

how to calculate micom relay earth falt time and current sertting

1819

WHAT HAPPENED DC SERIES MOTOR FIELD WINDING OPEN. CAN POSSIBLE.

3195

hello if any one have papers vof hpcl or sail, plz send me

1419

Usage of flywheel diode in relays

1460

State Maximum Power Transfer theorem.

720

I completed my BE EEE degree 2006 .... which license should i apply .... ?????

1167

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