A) \[\beta >\alpha \]
B) \[\alpha >\beta \]
C) \[\alpha \beta =1\]
D) \[\alpha =\beta \]
Correct Answer: A
Solution :
a and P-parameters of a transistor are defined as \[\alpha =\frac{{{i}_{C}}}{{{i}_{E}}}\] 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 \[\beta \left( \frac{\alpha }{1-\alpha },by\text{ }simple\text{ }mathematics \right)\] is about 20 to 100, we conclude that \[\beta >\alpha \].
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