Question

The relation between α and β is given by _________

(a) 1/(1-α)=1- β

(b) 1/(1+α)=1+ β

(c) 1/(1-α)=1+ β

(d) 1/(1+α)=1- β

I have been asked this question by my college professor while I was bunking the class.

Question is from The Common Collector Configuration in chapter Transistor Characteristics of Electronic Devices & Circuits

Answer 1

Right option is (c) 1/(1-α)=1+ β

For explanation I would say: The current amplification factor (β) is given by IC//IB. When no signal is applied, then the ratio of collector current to the base current is called current amplification factor of a transistor. β is an ac base amplification factor. α is called as current amplification factor. The relation of IC and IB change as IC= βIB+ (1+ β) ICBO.