Sunday, November 13, 2011

Power Electronics(PE) Lab Viva Question-Answers

Q1. What are the difference between transistor and SCR?

Q2. Explain latching current and holding current of the thyristor?

Q3. What are the advantages of MOSFET’s over BJT’s?

Q4. Why pulsed gate drive is used for SCR?

Q5. Define the delay angle of phase-controlled rectifier.

Q6. Why is power factor of semiconverter better than full converter?

Q7. What are the differences between freewheeling diode and feedback diode?

Q8. What is inverting operation of the converter?

Q9. What are control strategies of chopper?

Q10. Explain the use of step-up chopper.

Q11. What is four quadrant chopper?

Q12. What is the main difference between voltage source inverter and current source inverter?

Q13. What are PWM inverters?

Q14. What is cycloconverter?

Q15. What are the advantages and disadvantages of AC voltage controller?

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