A) 9
B) 27
C) 36
D) 108
Correct Answer: B
Solution :
Voltage amplification (gain) is given by \[A=\frac{\mu }{1+\frac{{{r}_{p}}}{{{R}_{L}}}}\] where \[\mu \] is amplification factor, \[{{r}_{p}}\] is plate resistance and \[{{R}_{L}}\] is load resistance. Given, \[\mu =36,\,\,{{r}_{p}}=10000\,\Omega ,\,\,{{R}_{L}}=30000\,\Omega \] Putting in the relation, we obtain \[A=\frac{36}{1+\frac{10000}{30000}}\] \[=\frac{36}{1+\frac{1}{3}}\] \[=\frac{36\times 3}{4}\] = 27
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