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Electrical interview questions – page 27

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  1. What the purpose of transient fault recoredr in substation

  2. Why Line voltage =1.732XPhase voltagewhat mean by 1.732

  3. What is hormonics. how it is generated & what are the problem faced by that.

  4. What are the advantages of star-delta starter with induction motor?

  5. What will happen ac motor give to dc supply

  6. What is the purpose of SF6 in HT breaker and what is the pressure should be maintain in the breaker?

  7. Why -48V dc power supply using in telecom field?

  8. Power transformer :- (in generating station)Alternator terminals side - DeltaHT transmission line side - StarWhy?

  9. What is the minimun earth resistance value of an industial bit and grid bit ? and Why?

  10. What is load shedding

  11. What are the parameters of EHT sub-station?

  12. What happen when dc shunt motor field is sudden open in runing condition

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  14. If transmission voltage expressed as the multipple of formfactor(1.11)........11,33,66,220 etc......then whymadakkathara substation(kerala) voltage is 400kv..not 440.....?

  15. What is called inrush current??

  16. By just seeing a transmission tower, how can we knew thevoltage it carries..?[110kv, 220kv, 400kv...]???

  17. What are the procedures followed for underground cablelaying.....???

  18. What is Bucholtz Relay test???? Explain??

  19. We have 110Vac ,10A ac supply which is converted into 110VDC & How much DC current? which factor is reqired for dc current calulation?

  20. What different in delta & star connection in motor?explain

  21. Which motor is suitable for traction? why?

  22. Why all selected supply voltages are multiple of 11.i.e440,11 kv,33 kv,66 kv,110 kv etc

  23. What is meant by auto transformer?

  24. How we select HRC FUSE ?

  25. What is the Difference Between resistance and resistivity?

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  27. What is a difference b/w earthing & neutral?

  28. What is the power ratio between power in Star and Delta circuit?

  29. Why we use star and delta connection?why we donot give the supply directly?

  30. What is difference between short ckt and overload?

  31. What is AB switch???

  32. Why we are using the ac supply in domestic purpose why don't use dc supply

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