Unit 3 – Amplifiers

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

1. What is a power amplifier?
   Delivers large AC power to load using high collector current.
2. Define CMRR.
   CMRR = Differential gain / Common-mode gain – measures noise rejection.
3. Where are RC-coupled amplifiers used?
   Voltage amplification in radios, TV, audio stages.
4. Define cascade amplifier.
   Two or more amplifier stages in series to increase gain.
5. Define differential amplifier.
   Amplifies difference between two inputs and rejects common signal.
6. Define voltage gain.
   Av = Vout / Vin.
7. What is Darlington pair?
   Two transistors connected emitter-to-base to give very high current gain.
8. Role of coupling capacitor.
   Passes AC to next stage and blocks DC.
9. Transistor as a switch.
   Operates in cut-off (OFF) and saturation (ON) regions.
10. Two applications of Class-C amplifier.
    RF oscillators and tuned circuits for high efficiency.

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

UNIT 3 – Amplifiers

1. What is a power amplifier?
   Load ( speaker ) க்கு high power deliver செய்யும் amplifier.
2. Define CMRR.
   CMRR = Differential gain / Common mode gain ; Noise rejection measure செய்யும்.
3. Where are RC coupled amplifiers used?
   Radio, TV, Audio voltage amplification இல்.
4. Define cascade amplifier.
   Two or more amplifier stages series ஆக connect பண்ணுவது.
5. Define differential amplifier.
   Two inputs இன் difference ஐ amplify செய்து common signal reject செய்கிறது.
6. Define voltage gain.
   Av = Vout / Vin.
7. What is Darlington pair?
   Two transistors emitter-to-base connect செய்து high current gain பெறும் pair.
8. Role of coupling capacitor.
   AC signal pass பண்ணி DC block செய்யும்.
9. Transistor as a switch.
   Cut-off (OFF) மற்றும் Saturation (ON) regions இல் operate செய்யும்.
10. Applications of Class-C amplifier.
    RF tuned circuits மற்றும் Oscillator circuits இல் use செய்கிறது.