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Electrical interview questions – page 21

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  1. Why metallic housing is provided of solenoid valve.

  2. Can we connect 2.2kw star motor in delta passion?

  3. What do you mean by linear and bilateral network?

  4. Define stator,rotor,excitor,rotating rectifier in generator?

  5. Why the transformer ratings in kva

  6. Transformer TTR test procedure

  7. Battery banks are in connected in series or parallel and why?

  8. What are advantages of dc over ac supply?

  9. What will happen if u run induction motor beyond its rated speed

  10. X is a uniformly distributed random variable that takesvalues betweeen 0 and 1.The value of E {X3}(x cube) will be.

  11. Keeping in view of parallel operation which of the 3 phase transformer connection are possible?a)delta-delta to delta-star b) delta-delta to star-delta c)star-star to delta-delta d) delta-star to star-delta

  12. How can we calculate the power factor of an electrical appliance ?Is there any formula ? Is there any meter around to calculate it ? And how to use that meter ? thanks

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  14. What is neutral voltage

  15. Stranded resistance values of motors?

  16. What will be the output of the temparature transmitter if temp is 120 degre celcius.

  17. Why the airgap of an induction motor is less compared tothat of a synchronous machine?

  18. How to calculate the current carrying capacity of a conductor. How it is related to diameter of cable or conductor

  19. Which type of harmonics minimum produce in 12 pulserectiformer transformer?a)3rd b)5th c)7th d)11th

  20. 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?

  21. Control modes

  22. What are the protection used for alternator,transformers.

  23. How can we decide the fualt levels of sub-stations?

  24. Which lamp will fuse first(1)20(2)40(3)200 three lamps will fuse together

  25. If power factor comes in leading & showing -0.95. Is thereany effect on electrical system? if yes, then please tell mewhat would be the effects. & how long we keep power factorin leading.Keeping power factor in leading shows more KW & less KVA isit correct or not.

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  27. Moving Iron instruments are applicable witha) DC only b) AC only c) DC & AC

  28. How out of step protection relay works?

  29. What is used root two in single phase line?

  30. At what condition differential relay will act in transformer and ht motor?

  31. If the ceiling fan is on slow speed, does it consume lesselectricity?

  32. What is the diffrence betwen primary pumps and secondary pumps in aircoditioning field

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