1.

Assertion: In common base configuration, the current gain of the transistor is less than unity. Reason: The collector terminal is reverse biased for amplification.

Answer»

If both the assertion and reason are true and reason is a true explantion of the assertion.
If both the assertion and reason are true but thereason is not true the correct explantion of the assertion.
If the assertion is true but reason false
If both the assertion and reason are false.

Solution :In COMMON base configuration input is applied between emitter and base and output is taken between collector and base. In this connection the base of the transistor is made common to both input and output terminals. For amplification, emitter terminals is forward biased and collector terminal is reverse biased. In this configuration, the CURRENT gain is ratio of change in collector current to the change in emitter current at constant collector base VOLTAGE `(V_(CB))`.
`:. alpha=((DeltaI_(C))/(DeltaI_(E)))`
Current gain `(alpha)` is less than unity because collector current `I_(C)` is always less than emitter current `(I_(E))`. Hence, option (B) is true.


Discussion

No Comment Found

Related InterviewSolutions