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Transistors and Applications

Q1: The formula used to calculate the approximate ac resistance of the base-emitter diode (re) is

A mca17_1005a1.gif

B re almostequal.jpg 25 mV × IC

C mca17_1005c1.gif

D mca17_1005d1.gif

ANS:A - mca17_1005a1.gif

The AC emitter resistance determines the voltage gain. Therefore AC emitter resistance equals 25mv divided by DC emitter current.



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