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Power MOSFET MCQs

Practice Power MOSFET MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Power ElectronicsPower MOSFET

A power MOSFET is primarily a?

  • AVoltage-controlled device
  • BCurrent-controlled device requiring continuous base current
  • CFour-layer latching thyristor
  • DBidirectional breakover diode
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Correct Answer: A. Voltage-controlled device
Explanation: The insulated gate of a MOSFET is controlled mainly by gate-to-source voltage, with negligible steady-state gate current ideally.
Reference: Standard power electronics: power mosfet
Question 2
Power ElectronicsPower MOSFET

Compared with an SCR, a power MOSFET can normally be turned OFF by?

  • ARemoving or appropriately changing its gate-to-source drive
  • BReducing load current below holding current only
  • CApplying a DIAC pulse only
  • DWaiting for AC current zero in every application
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Correct Answer: A. Removing or appropriately changing its gate-to-source drive
Explanation: A MOSFET is a fully controlled switch: its channel can be turned on and off by controlling gate voltage.
Reference: Standard power electronics: power mosfet
Question 3
Power ElectronicsPower MOSFET

For high-frequency low-to-medium voltage switching, a power MOSFET is often preferred because of its?

  • AFast switching capability
  • BNeed for continuous gate current
  • CLatching behavior like an SCR
  • DVery slow turn-off
Report an error
Correct Answer: A. Fast switching capability
Explanation: Power MOSFETs are majority-carrier devices and can switch rapidly, making them useful at relatively high switching frequencies.
Reference: Standard power electronics: power mosfet