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 t_df, initial fall time t_f1, and final fall time t_f2

t_off = t_df + t_f1 + t_f2

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2. What is meant by line commutated inverter?

Answer:

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

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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.

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