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AP EAMCET Engineering 2013 Solved Paper
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© examsnet.com
Question : 39
Total: 160
The base current in a transistor circuit changes from 45 µA to 140 µA. Accordingly, the collector current changes from 0.2 mA to 0.400 mA. The gain in current is
9.5
1
40
20
Validate
Solution:
Current gain
β
=
Δ
i
C
Δ
i
b
Δ
i
c
=
(
4
−
0.2
)
m
A
=
3.8
×
10
−
3
A
Δ
b
=
(
140
−
45
)
µ
A
=
95
×
10
−
6
A
∴
β
=
3.8
×
10
−
3
95
×
10
−
5
=
40
© examsnet.com
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