Question

What happens if collector current increases in a collector emitter feedback circuit?

(a) Emitter voltage increases therefore base voltage increases

(b) Emitter voltage decreases therefore base voltage decreases

(c) Emitter voltage increases therefore base voltage decreases

(d) Emitter voltage decreases therefore base voltage increases

I have been asked this question in an international level competition.

Question is taken from Collector-Emitter Feedback Bias in portion Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

Answer 1

Right answer is (a) Emitter voltage increases therefore base voltage increases

To explain I would say: If the collector current VC is increased, the corresponding emitter current also increases. Which in turn causes the voltage across RE to increase. This in turn causes a proportional rise in the base voltage since VB = VE + VBE.