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The gate voltage at which a junction field effect transistor's channel closes is the ______ voltage.

  • A.saturation
  • B.pinch-off
  • C.threshold
  • D.breakdown

Answer: B

This is the pinch-off voltage. Threshold is the enhancement MOSFET's equivalent with the opposite sense, breakdown is a destructive limit, and saturation describes the region beyond pinch-off rather than a voltage. Four terms for turning points in a characteristic, and attaching each to its own device and mechanism is what keeps them from being interchanged.

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