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Electrical interview questions – page 9

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

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  1. What is the significance of transistor number (exam.BC557,CIL188 etc) ?

  2. What is state space method ? Why its used ?Can it applicable on linear, non-linear, 1st order, higherorder, homogeneous, non-homogeneous, open-loop , closedloops , stable & unstable systems ?

  3. HOW WE ARE DECIDING WHILE PROGRAMMING IN PID CONTROLLER THAT WE ARE USING HEATING OR COOLING???????

  4. What happens if generator is running leading power facotor?

  5. What is the SKIN effect in a condactor and how can bedecrease??????

  6. Why should we use the igniter in the sodium vapour lamp.

  7. Why should an electronics and communication engg. student should join TCS?

  8. 1.After synchronising the alternator to the grid,how we rdelivering power to the grid?if the i/p increases does thespeed hence frequency increases?2.y the power factor is changing when exitation changes?whatis the relation with p.f and flux?

  9. Why HT motor is connected in Star?

  10. What is the meaning of EDO in DG panels?

  11. Why 24VDC power Supply is used as standard for all looppowered transmitters?

  12. What is the difference between voltage transformer and potential transformer?

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  14. What is the difference between thyristors and capacitors

  15. Why two nos. un-tensioned wires are placed inside the PSC poles used by powergrid in RGGVY works.

  16. Three phase 180kva diesel generator can take how much load in amp and what is formula to get this?

  17. How vector surge relay works ?

  18. What is Difference Between Induction Motor & Servo Motor

  19. WHAT IS VFD,FUNCTION, PURPOSE,

  20. What is use of capacitor in pcb circuits which work on dc but capacitor blocks dc..?

  21. What is droop?

  22. What is distortion of power amplifier? The amplifier whosedistortion is 0.02% and the one whose distortion is 0.01%,Which one is better?

  23. Why CT?s shall not be kept open?

  24. Why HT motors are connected in star.

  25. Procedure for conduting vector group test on power transformers.why it is conducted?

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  27. How many types of transformer.

  28. How do we calculate contactor and fuse rating for a motor if its full load current is known,i want exact calculation for 1.5 kw motor????

  29. HOW TO DETERMINE THE RUNNING CURRENT IN AMPERES OR THE ENERGY CONSUMED IN WATTS?

  30. Is it possible that Generator trip but Turbine not trip.Giveexplanation.

  31. We have one ups its neutral is not earthed.its one distribution MCB has a earth fault.but we can not put off any MCB.so how to find out that in which circuit is earthed without isolating the breaker.

  32. In 50 mw generator if field is open in full load running condition what happen and for protection which relay used?

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