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In a common emitter amplifier the input ...

In a common emitter amplifier the input signal is applied across

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
C
A good amplifier stage is one which has high input resistance and low output resistance. A transistor in CB configuration has a very law resistance `(cong 20 Omega)` and a very high output resistance `(cong 1 M Omega).` It is just the reverse of what is required. The CE configuration is better, its input resistance is about `1 kOmega` and output resistance about `10 kOmega`. Although input resistance of CE is not very high but it still prefers better amplifier.
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