Question:
When an n-p-n junction transistor is used as an amplifier in common emitter mode,
When an n-p-n junction transistor is used as an amplifier in common emitter mode,
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In CE mode, the input is small (Base), output is big (Collector), and the signal is "flipped" ($180^\circ$ shift).
Updated On: May 14, 2026
- the base emitter junction is reverse biased.
- the input impedance is high and the output impedance is low.
- input signal is applied between the base and emitter and the output is obtained between collector and emitter.
- the input voltage and the output voltage are in phase.
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The Correct Option is C
Solution and Explanation
Step 1: Concept
For a transistor to function as an amplifier in CE (Common Emitter) mode, the emitter-base junction must be forward biased and the collector-base junction must be reverse biased.
Step 2: Meaning
"Common Emitter" means the emitter terminal is common to both the input and output circuits.
Step 3: Analysis
- (A) Incorrect: E-B junction must be forward biased.
- (B) Incorrect: Input impedance is low (forward bias) and output is high (reverse bias).
- (C) Correct: The base-emitter is the input port and collector-emitter is the output port.
- (D) Incorrect: There is a $180^\circ$ phase shift in CE amplifiers.
Step 4: Conclusion
Statement (C) correctly describes the terminal connections. Final Answer: (C)
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