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Electrical interview questions – page 3

1,095 questions. Tap “Show answer” to check yourself.

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  1. Why can't we use 5-20mA standard or some other instead of 4-20mA?

  2. What do you mean by isolators and circuit breakers?

  3. What is the difference between Earthing,Grounding and neutral?

  4. What is the equation of insulating resistance of motor???

  5. In case of 3Phase Supply, Voltage R-Earth/Neutral - 220 Y-Earth/Neutral - 220 Z-Earth/Neutral - 220 Total is -> 660VoltsThen Why it is said that 3Phase supply is 440

  6. Difference between servo motor and synchronous motor

  7. What is the resultant phase shift in a 3 phase power systemincluding neutral if on or more phases gets grounded orshort circuited.kindly explain in detail for the reasons...

  8. What's is the difference between IVT and CVT?

  9. How can we measure and monitor critical performance parameters of Diesel Generator Sets, both electrical and engine ?

  10. Can you explain the concept of zones inBus bar protection and how can we differentiate the mainzone and check zone in Bus bar protection

  11. How to zero trim the level transmitter by using foundation fieldbus communicator.

  12. In a plug point why the hole size at the top is large?

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  14. In case of three phase induction motor,when it is connected to three phase supply,why the magnetic field is rotets around the armeture?

  15. Generally on the roadside v hav 11kv line which is beingstep down to 440v line to line....so any1 can tell me whichtype of transformer they r using whether it is star todelta,delta to star etc...???

  16. Difference between isolator and circuit breaker?????

  17. What is difference between RTD , thermo couple and thermistor in general ?? (except temperature co-efficient )

  18. How can be connected thermocouple in series?what is the need?

  19. What is the calculation of current when a clampmeter is attached to two phases of any drives.

  20. What is relation between electronics&instrumentation

  21. What is the Chemical Formula of Mineral Oil used in Transformer. It is Challenged for all Chemical Engineers.

  22. What is IDMT relay.

  23. Why a motor rating in KW?

  24. Principle of FTIR

  25. What is phase and neutral.

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  27. How to carry out Magnetizing Current Test on Distributiontransformer and what purpose we are doing this test.

  28. How do u calculate CT rating for 10 mva transformer

  29. A 6-pole, 50 Hz, 3-phase synchronous motor and on 8-pole, 50 Hz, 3-phase slip-ring induction motor are mechanically coupled and operate on the same 3-phase, 50 Hz supply. If they are left open-circuited, then the frequency of the voltage produced across any two slip rings would be

  30. How many methods for starting an induction motor?

  31. Can anybody have aptransco model papers Please share ??

  32. How to measure ducting in HVAC.

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