Question 156: Semiconductors and Logic Gates

Question

The current gain of a common emitter amplifier is 69. If the emitter current is 7.0 mA, collector current is :

Accepted Answer

Here, $$\beta $$ = 69, I
e
= 7 mA, I
c
= ?
$$\alpha $$ = $${\beta  \over {1 + \beta }}$$ = $${{69} \over {70}}$$
Also, $$\alpha $$ = $${{{I_c}} \over {{I_e}}}$$
$$ \Rightarrow $$ $${{69} \over {70}} = {{{I_c}} \over 7}$$
$$ \Rightarrow $$ I
c
= $${{69} \over {70}} 	imes 7$$ = 6.9 mA

Answer

9.6 mA

Answer

6.9 mA

Answer

0.69 mA

Answer

69 mA

Semiconductors and Logic Gates

The current gain of a common emitter amplifier is 69. If the emitter current is 7.0 mA, collector current is :

Choose the correct answer: