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Electrical interview questions – page 5

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  1. What is protection class current transformer.

  2. How to calculate overall heat transfer coefficient in insulated pipeline? Please give a answer with formula

  3. What happen if we give 220 volts dc supply to d bulb r tube light?

  4. Give single line diagram of D.O.L and star -Delta starter ?

  5. In a power transformer usuall which winding is closer to the core? (A) Primary winding (B) Secondary winding (C) Low Voltage winding (D) High Voltage winding

  6. What is the different between surgearrester and lighting arrester

  7. What is the difference in MCB, MCCB, RCCB, ELCB, & MPCB (motor protection circuit bracker)

  8. Whay we transmit power in 3phase no in 4 or 2 or 5......etc?

  9. What is PIR (pre inserting resistance) in 400kv EHV SF6 BREAKER? Why it use?

  10. What is the synchronous timer ? and it applications.

  11. CALCULATE THE TOTAL VOLTAGE DROP AND SELECT THE CABLE SIZE IN MM-SQARE FOR A PANEL-262KW AT 110 METER FROM THE SOURCE SUPPLY , SUPPLY VOLTAGE 240/415

  12. If the capacitor bank is installed in switchyard say132/22kv then on LT side say 22kv/0.433kv is it necessary toinstall capacitor bank for maintaining power factor. if pfis maintained on HT side then will that be maintained on LTside as well.if not then how&why??????/ pleaseexplain...........

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  14. How instantanious short circuit current is calculated ? its formula.

  15. What is fuction static switch in ups and tell me use parts name and fucion

  16. What is an SCR?

  17. In brushless excitation system how generator field current is measure even if the slip rings are absent?

  18. How much KVAr bank reqired for 630 KVA transformer on full load for maintain power factor upto.99

  19. In which base we defined the conductor is Dog type, Squirrel type, rabbit type, wolf type etc used in transmission line?

  20. Shunt reactor is used in EHV Transmission line for..............?

  21. Why current leads the voltage in case of capacitor load?Why voltage leads the current in case of inductive load?Why both are with in phase in case of restive load?

  22. What is the working difference b/w softstarter and Variable frequency drive ?

  23. What is relation between vector group of transformer and its load hormonics?

  24. Whu does the power factor of diesel generator always be 0.8.please explain

  25. IS RTCC AND OLTC REQUIRED FOR 500 KVA 11KV/433V TRANSFORMER FOR AN INDUSTRY?

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  27. What is triac?

  28. What is servo motar?

  29. What is Antenna gain.

  30. What is the formulae for calculating the cable size for agiven voltage and current.

  31. Why capacitor bank always connected in delta,why not in star to a system?

  32. How much kn lightning arrestor is used in 11kv line

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