Power Electronics Important Questions and Answers

Power Electronics Important Questions and Answers:

1. Define ” Turn off time” of SCR.

Answer:

Turn off time of SCR composed of three intervals delay time tdf, initial fall time tf1, and final fall time tf2

toff = tdf + tf1 + tf2


2. What is meant by line commutated inverter?

Answer:

Phase Controlled converters when operated in the inverter mode, are called line commutated inverter.


3. What are the advantages of SMPS over factors controlled rectifiers?

Answer:

  1. Small size and less weight
  2. High Efficiency
  3. Less sensitive to input voltage variations.