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Electrical interview questions – page 30

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  1. Why in screw & centrifugal compressor using rolor bearing

  2. Hi can you give any body fault level calculation, generatorfault level calculation,transformer fault level calculationfor system fault level with equation? i have 3.3kvgeneration voltage three gas gen sets, one is 1.9MW,2nd is2.5MW,& 3rd is 3.8MW & i have 11 kv generation voltage onegas gen sets is 3.8MW, we are step up to 22kv by transformer

  3. How to calculate the no. of earth pits required for an electrical installation?

  4. Can you operated Transformer on frequency from that for which is design?

  5. Any meter avilable for measureing the Transformer Losses. ( like Voltmeter for voltage & ammiter for currenr )if yes plz give the make & supplier address, Email, Phone number.

  6. 6.6 KV /.415KV Step down trf. we can get 6.6 KV fromprimary by applying .415 KV secondary side by same TRF.

  7. How can we change the supply voltage?

  8. Why we use negative 24vdc to a proximeter

  9. Y neutal is required for 3 phase. neutral carrys only current or voltage. in 3 phase circuits.

  10. What happens when back feeding supply accidently collapseswith normal supply ??? How??[that is sometimes in a substation 11kv feeder if their wslong time permit work, back feeding supply will provide fromnearest substation... if accidently after the permitwork,they charged the feeder without removing back feedingwat will happen...?]

  11. WHY AREWE USING THE 3 1/2 CORE CABLES IN POWER TRANSMISSION

  12. Can we operate a DG Set in paralell with Transformer ?

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  14. WHY TEMPEARATURE RISE TEST IS CONDUCTED IN BUS BARS AND ISOLATORS?

  15. What is meant by Active and reactive power?

  16. What is the function of an Auto reclosure relay. How does itwork??

  17. What is harmonic distortion?how it minimise?

  18. How much duration I can keep open the CT if it is under loading condition(100 Amp load)?

  19. Why transformer used to mention in KVA

  20. SR flip flop is basically which type of multivibrator?

  21. What is meant by pitch of a synchronous machine.??

  22. What is the rating of your capacitor bank at your company.

  23. Why sequence generator should not directly connected to joiner transformation ?

  24. What is difference of electrical and electronics

  25. Give a brief idea about Control circuit wiring inSubstation...???

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  27. Where does core based current transformer is used? and whatis the value of lux in a work station?

  28. What is rectifier

  29. Why are we adopting 132kv,220kv for transmission rather than using 440kv at all transmission lines as it gives lower losses?

  30. What is DAR test?

  31. In our homes we place the 5Amps fuse...now in our house onlytakes 5Amps for all normal conditions ha???

  32. How maesure earth neutral value & how much maximum value value required in between earth & neutral.

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