SATHEE: Semiconductor Electronics Materials Devices and Simple Circuits

Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 73

75. A transistor is operated in common emitter configuration at constant collector voltage $V_{c} =$ $1.5 V$ such that a change in the base current from $100 μ A$ to $150 μ A$ produces a change in the collector current from $5 m A$ to $10 m A$ . The current gain $(β)$ is

[2006]

(a) 75

(b) 100

(c) 50

(d) 67

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Answer:

Correct Answer: 75. (b)

Solution:

$\begin{aligned} (b) Δ I_{b} = + 50 μ A, Δ I_{c} = 5 \times 10^{- 3} A \\ β = \frac{Δ I_{c}}{Δ I_{b}} = \frac{5 \times 10^{- 3}}{50 \times 10^{- 6}} = \frac{5 \times 1000}{50} = 100 \end{aligned}$

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Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 73

75. A transistor is operated in common emitter configuration at constant collector voltage Vc= 1.5V such that a change in the base current from 100μA to 150μA produces a change in the collector current from 5mA to 10mA. The current gain (β) is

Answer:

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75. A transistor is operated in common emitter configuration at constant collector voltage $V_{c} =$ $1.5 V$ such that a change in the base current from $100 μ A$ to $150 μ A$ produces a change in the collector current from $5 m A$ to $10 m A$ . The current gain $(β)$ is