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The triodes P and Q havethe same aplification factr 40. Their plate resistances are 4kohms  and 8kohms , respectively. If an amplifier curcuit is designed using anyone of them and a load resistance is of 8kohms , the ratio of voltage gain obtained from them will be ?

Asked by Varshil 24th April 2019, 7:43 AM
Answered by Expert
Answer:
F o r space t r i o d e space v o l t a g e space a m p l i f i c a t i o n space f a c t o r space i s space g i v e n space b y
A space equals space fraction numerator mu over denominator 1 plus begin display style r subscript p over R subscript L end style end fraction
w h e r e space mu space i s space a m p l i f i c a t i o n space f a c t o r
r subscript p space end subscript i s space t h e space p l a t e space r e s i s tan v e
R subscript L space end subscript i s space t h e space l o a d space r e s i s tan c e
F o r T r i o d e space A
V o l t a g e space g a i n space equals space fraction numerator 40 over denominator 1 plus begin display style 4000 over 8000 end style end fraction space equals space fraction numerator 40 over denominator 1.5 end fraction space equals 26.67
F o r space t r i o d e space B
b o l t a g e space g a i n space equals space fraction numerator 40 over denominator 1 plus begin display style 8000 over 8000 end style end fraction equals space 40 over 2 space equals space 20
Answered by Expert 24th April 2019, 11:18 AM
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