In this tutorial we are going to learn about Best Interview Questions for Power Electronics
Question1. What is use of SCR?
Answer- SCR is current control voltage blocking device.
Question2. Which types of switch use for flood light & industrial heating?
Answer – TRIAC use as switch for flood light & industrial heating.
Question3. How to use freewheeling diode at load side?
Answer – Always parallel connected to load with freewheeling diode.
Question4. When more power loss in SCR?
Answer- At the raise time more power loss in SCR.
Question5. What is use of cyclo – converter?
Answer- It is frequency changer.
Question6. Which angle the maximum conduction period of SCR?
Answer – 180o angle is best for maximum conduction period of SCR.
Question7. Which device has combines the characteristics of BJT & MOSFET?
Answer – IGBT process high input impedance like a MOSFET & has low on state power loss as in BJT.
Question8. If latching current of SCR is 20mA, then what will be holding current?
Answer – 40mA, generally latching current is 2 or 3 times of holding current.
Question9. If a boost regulator has an input voltage of 5V and the average output voltage of 15V. then duty cycle will be ?
Answer – 2/3, Boost regulator is step up chopper
VO = VS /1-ὰ =
15 = 5/1- ὰ =
Question10. What is duty cycle of chopper?
Answer- ὰ = TON /T & ὰ = 0 to 1.
Question11. What is operated frequency of power MOSFET?
Answer- Power MOSFET has low turn off time, so it can be operated in a frequency range 1 to 10 MHZ.
Question12. How protect the SCR from thermal conditions?
Answer- By using heat sink can be dissipated.
Question13. What is use of Chopper?
Answer – It convert Fixed DC to variable DC.
Question14. What is transistor turn ON & turn OFF time depends?
Answer – Transistor turn ON & turn OFF time depend on junction capacitance.
Question15. What is Terminals name of Power Mosfet?
Answer- 1. ) Drain 2.) Source 3.) Gate
Question16. What is Terminals name of Transistor?
Answer- 1. ) Collector 2.) Emitter 3.) Base
Question17. What is Terminals name of SCR?
Answer- 1. ) Anode 2.) cathode 3.) Gate
Question18. What is Terminals name of DAIC?
Answer- 1. ) MT1 2.) MT2 3.) Gate
Question19. What is Terminals name of IGBT?
Answer- 1. ) Gate 2.) Collector 3.) Emitter
Question20. What is Terminals name of TRAIC?
Answer- 1. ) MT1 2.) MT2 3.) GATE