Unit 2 – Transistors & Biasing

English – Part B (2-mark) Short Answer Questions and Answers

1. What is transistor biasing?
   Applying proper DC voltages to fix a stable Q-point.
2. Define cutoff region.
   Both junctions reverse-biased; transistor OFF; IC ≈ 0.
3. Bias condition for active region.
   Emitter-base forward biased; collector-base reverse biased.
4. Why base region thin and lightly doped?
   Allows most carriers to reach collector → high current gain.
5. Phase difference between input and output in CE mode.
   180° out of phase.
6. Majority carriers in NPN transistor.
   Electrons.
7. What is Q-point?
   DC operating point (IC, VCE) with no AC signal.
8. Define saturation region.
   Both junctions forward biased; maximum current; transistor ON.
9. Name any two biasing methods.
   Fixed bias and voltage-divider bias.
10. Applications of CE configuration.
    Used as voltage amplifier ( high gain, phase inversion ).

Tamil- Part B (2-mark) Short Answer Questions and Answers

1. What is transistor biasing?
   Transistor க்கு proper DC voltage apply பண்ணி Q-point fix பண்ணுவது.
2. Define cutoff region.
   Emitter-base மற்றும் Collector-base junctions reverse biased; Transistor OFF ஆகும்.
3. Bias condition for active region.
   Emitter-base forward bias, Collector-base reverse bias.
4. Why base region thin and lightly doped?
   Thin base carriers collector க்கு easy ஆக போக help செய்கிறது; light doping base current reduce செய்கிறது.
5. Phase difference between input and output in CE mode.
   Output 180° out of phase ஆகும்.
6. Majority carriers in NPN transistor.
   Electrons.
7. What is Q-point?
   Transistor DC operating point ( Ic & Vce ) – signal இல்லாமல் நிலை.
8. Define saturation region.
   இரு junctions forward biased; Transistor ON ஆகி maximum current flow ஆகும்.
9. Name any two biasing methods.
   Fixed bias மற்றும் Voltage divider bias.
10. Applications of CE configuration.
    Voltage amplifier ஆக use பண்ணப்படுகிறது ( High gain & phase inversion ).