Just Crack Interview

Electrical interview questions – page 6

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

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  1. What is the difference between single and double compression cable gland

  2. What is the difference between ONLINE UPS and OFFLINE UPS?

  3. Why 20logA is used as voltage gain and 10logA is used aspower gain

  4. When do you use a VFD motor?

  5. Can we use existing 6300V alternator for generating 6600V byincreasing excitation,what are advantages & disadvantages toalternator & motors of 6600V.

  6. What is the current flow from telephone when call is made?

  7. What is the equivalent circuit of a transformer and its vector diagram?

  8. Why we use 250 ohm resistor in series with HART protocol communication?

  9. if 15kv is grounded directly what will happen, why it should not be grounded like that

  10. What effect at thersold value on transmission power isincrease or decrease in telecommunication

  11. How to calculate the time setting for star connection in star delta starter? For example 10KW 3PH Induction motor.

  12. Which type starter is used for synchronous motor?

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  14. Why Capacitor & ignator used in MH lamp

  15. In a closed room, if the door of refrigerator is left openwhat will be the effect on temperature in the room. Explain

  16. Capacitor is load free component but why ampare meter shows current when capacitor bank breaker close?

  17. What is the basic difference between earthing, ground and neutral?

  18. What is rise time and half time

  19. What is the function of stater in tube light circuit?

  20. What is the d/f b/w iverter & converter.

  21. What is voltage rise and voltage drop?

  22. What is the different between rms and average value

  23. What is difference between single phase and three phase.

  24. How meney insolater need in 66kv line

  25. How the harmonics are generated in transforemer?

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  27. HT motors are generally connected in star, what will be the effect if we connect HT motor in Delta?

  28. Why single phase induction motors are not self staring ? how can we start the 1-phase Induction motor ?

  29. Whats the use of GNAC(Generator Neutral Accessory Compartment)

  30. Ac and dc motor advandtage,disadvantage,aplication

  31. What is iron loss?

  32. What is the differance of acb and mcb and mccb

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