GATE EE 2015 Set 2 — Question 25

MCQ+1 / -0.33EasyBJT & FET BiasingAmplifiers & FeedbackAnalog & Digital Electronics

Analog & Digital Electronics → Amplifiers & Feedback → BJT & FET Biasing

Last updated 5 September 2026

Question

When a bipolar junction transistor is operating in the saturation mode, which one of the following statements is TRUE about the state of its collector-base (CB) and the base-emitter (BE) junctions?

Correct answer (C) Both the CB and BE junctions are forward biased. Solution In a Bipolar Junction Transistor (BJT), the operating modes are defined by the biasing of the base-emitter (BE) and collector-base (CB) junctions: 1. Cut-off Mode : Both BE and CB junctions are reverse biased. 2. Active Mode : The BE junction is forward biased and the CB junction is reverse biased. 3. Saturation Mode : Both the BE and CB junctions are forward biased. 4. Reverse Active Mode : The BE junction is reverse biased and the CB junction is forward biased. Therefore, in saturation mode, both junctions are forward biased. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (C) Both the CB and BE junctions are forward biased. Solution In a Bipolar Junction Transistor (BJT), the operating modes are defined by the biasing of the base-emitter (BE) and collector-base (CB) junctions: 1. Cut-off Mode : Both BE and CB junctions are reverse biased. 2. Active Mode : The BE junction is forward biased and the CB junction is reverse biased. 3. Saturation Mode : Both the BE and CB junctions are forward biased. 4. Reverse Active Mode : The BE junction is reverse biased and the CB junction is forward biased. Therefore, in saturation mode, both junctions are forward biased.

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