Q31 of 71 Page 418

When the base current in a transistor is changed from 30 μA to 80 μA, the collector current is changed from 1.0 mA to 3.5 mA. Find the current gain β.

Current gain, β=Rate of change of collector current with respect to base current at constant output voltage

• β=


• β=0.05×103


• β=50


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29

Draw the current voltage characteristics for the device shown in figure between the terminals A and B.



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Find the equivalent resistance of the network shown in figure between the points A and B.



 32

A load resistor of 2 kΩ is connected in the collector branch of an amplifier circuit using a transistor in common-emitter mode. The current gain β = 50. The input resistance of the transistor is 0.50 kΩ. If the input current is changed by 50 μA,

(a) by what amount does the output voltage change,


(b) by what amount does the input voltage change and


(c) what is the power gain?


 33

Let evaluate X for

(a) A = 1, B = 0 C = 1


(b) A = B = C = 1 and


(c) A = B = C = 0.