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The use of by-pass capacitor in CE amplifier is _________

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The use of by-pass capacitor in CE amplifier is _________

(a) to increase voltage gain

(b) to increase negative feedback

(c) for decreasing the frequency

(d) to block dc

I had been asked this question in an interview for internship.

This interesting question is from CE Amplifier with an Emitter Resistance topic in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Right answer is (a) to increase voltage gain

For explanation I would say: When an emitter resistance is added in a CE amplifier, its voltage gain is reduced, but the input impedance increases. Whenever bypass capacitor is linked in parallel with an emitter resistance, the voltage gain of CE amplifier increases.

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