The GATE Grind

GATE 2024 EE – Question 27

Power Electronics · Static V-I characteristics and firing/gating circuits for Thyristor, MOSFET, IGBT · 1 mark · Multiple choice

If the following switching devices have similar power ratings, which one of them is the fastest?

  1. SCR
  2. GTO
  3. IGBT
  4. Power MOSFET

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Show answer and explanation

Correct answer: (D) Power MOSFET

Explanation

The power MOSFET is a majority-carrier device with no minority-carrier storage delay, so it has the shortest switching times (hundreds of kHz to MHz). The IGBT is slower because of tail current, and the GTO and SCR are the slowest thyristor-type devices.