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14. Semicondutor electronics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics14. Semicondutor electronics1 Mark
MCQ
Assertion : A transistor amplifier in common emitter configuration has a low input impedence.
Reason : The base to emitter region is forward biased
  • ✓
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
Input impedance of common emitter configuration.

$=\left|\frac{\Delta V_{B E}}{\Delta i_{B}}\right|_{V_{C E}=\text { constant }}$

where $\Delta V_{B E}=$ voltage across base and emitter (base emitter region is forward biased)

$\Delta i_{B}=$ base current which is order of few microampere.

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