Semiconductor Electronics Materials Devices And Simple Circuits Ques 85
85. An $n-p-n$ transistor conducts when [2003]
(a) both collector and emitter are negative with respect to the base
(b) both collector and emitter are positive with respect to the base
(c) collector is positive and emitter is negative with respect to the base
(d) collector is positive and emitter is at same potential as the base
Show Answer
Answer:
Correct Answer: 85.(c)
Solution:
When the collector is positive and emitter is negative w.r.t. base, it causes forward biasing of the emitter-base junction and reverse biasing of the collector-base junction, which allows conduction of current.
A transistor is mostly used in the active region of operation i.e., emitter base junction is forward biased and collector base junction is reverse biased.
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