A) \[\beta >\alpha \]
B) \[\alpha >\beta \]
C) \[\alpha \,\beta =1\]
D) \[\alpha =\beta \]
Correct Answer: A
Solution :
\[\alpha \]and \[\beta -\]parameters of a transistor are defined as \[\alpha =\frac{{{i}_{C}}}{{{i}_{\text{E}}}}\]and \[\beta =\frac{{{i}_{C}}}{{{i}_{B}}}\] where \[{{i}_{C}}=\]collector current, \[{{i}_{E}}=\]emitter current, \[{{i}_{B}}=\]base current. As \[{{i}_{B}}\]is about 1 to 5% of \[{{i}_{E}},\alpha \]is about 0.95 to 0.99 and\[\beta \](\[\frac{\alpha }{1-\alpha },\] by simple mathematics) is about 20 to 100, we conclude that \[\beta >\alpha .\]
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