Electrical Engineering Interview Questions

Suppose a 3 phase, 2 pole, 440V induction motor is driving a flywheel of 600mm diameter, 150kg mass. By using v-belt and pulley, the speed is increased to 4500 RPM. What will be the effect on motor current?

199

what is the difference between changer, converter and transformer?

211

what is the difference between transformer,converter and transducer

328

what is the ATS .And how it works.

242

What is distance between electrical panel to land ?

149

highest rating of alternator used in india

272

why impudance relay used for medium transmission power system? why not others?

110

what are the functions of fuse ?

368

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

165

What is installed in PAC that is control the humidity

244

what will be the min and max voltage flow from neutral to earth?

182

Maintenance of transformer???

252

Explain UPS

339

If a high resistance fault occurs,then what are the changes will happen in the system?

214

How to calculate Grid rotor resistance(GRR) losses in slip ring induction motor?

544

Un-Answered Questions { Electrical Engineering }

What is process of anneling transformer core

626

Dear sir, By which formula u can calculate for a particular kv line there is a range of mw.

858

we can run 2phase as 3phase .what will be the differnce with respect to phase angle, power, current between the two modes

903

what is the easiest method of short circuit current calculation ? pls. derive with a mathematical example in real life application.

1239

I am abt to give IOCL intrv.Plz sir guide me for IOCL intrvw (Electrical).Which subject to be consider. questions are generally asked from which subject.Plz help me out.

812

draw vector diagram and +ve,zero sequence diagram of symmetrical three phase fault.

730

what the Microsoft .NET framework is?

712

how many types of motor can be used in washing machine

909

is it possible to say motor horsepower number without seeing name plate(when name plate damaged)

844

if i am in front of transmission line how to know that current direction without any equipment

462

What is electrical cable termination

1457

TRAFO 1. WHY BREATHER IS USED. 2. WHY OIL GOES DOWN IN CONSERVATOR TANK. 3. WHY WE ARE TAKING OIL SAMPLE TAKING FROM BOTTOM OF TRANSFORMER. 4. HOW TO CHECK IR VALUE OF TRANSFORMER. 5. WHY OLTC HAVING BUCHHOLZ TRIP ONLY; WHY NO ALARM. 6. OFF LOAD TAP CHANGER OPERATION PROCEDURE. 7. TR. SHUTDOWN / ISOLATION PROCEDURE. 8. WHEN THREE TRS. IN PARALLEL, ONE TR. IS NOT SHARING THE LOAD – WHAT IS REASON AND WHAT YOU WILL DO. 9. WHY TR. HAS OLTC IN HV SIDE. 10. WHAT IS % IMPEDANCE. 11. WHY TR. RATING IN MVA. 12. WHAT IS VECTOR GROUP IN TR. 13. CONDITION FOR PARALLEL OPERATION OF TRS. 14. WHAT IS TERTIARY WINDING. WHERE IT WILL BE. 15. IF TR. TRIP ON BUCHHOLZ OR TAP CHANGER RELAY, WHAT YOU WILL DO. 16. DIFFERENCE BETWEEN OIL TEMP. AND WINDING TEMP. PROTECTION 17. HOW WINDING TEMP. IS MEASURED IN CAST RESIN TR. 18. DIFFERENT TYPES OF FAULTS IN TR. Trafo - Page-1 of 2 19. WHAT HAPPENS WHEN TR. CHARGED FROM LV. 20. WHAT WILL YOU DO IF MEGGER READING SHOWS ZERO BETWEEN LV WINDING AND EARTH. 21. CAN WE INTERCHANGE BUCHHOLZ RELAY OF MAIN TANK AND OLTC TANK. 22. IF THE LINE BETWEEN BREATHER AND CONSERVATOR TANK 23. LOCKED, WHAT WILL HAPPEN DURING LOAD CYCLE. 24. WHAT IS THE FUNCTION OF OIL SEAL IN BREATHER. 25. WHAT ARE LOCATIONS FOR BUCHHOLZ RELAY FIXED IN POWER TR. 26. WHAT ARE CHECKS IN POWER TR. DURING MAINTENANCE. 27. WHAT IS IMPORTANT WHEN WE CHECK OLTC OPERATION DURING MAINTENANCE. Trafo - Page 2 of 2

1205

why is the power generator connected as star earthed or star earthed through reactance and what its features ?

455

Terminal blocks is used for segregate the connections... There is any principle for terminal block..?

931

diff.between servo motor and ac motor

835