The a-c current Gain  of A Transistor Is 150. What Will Be The Change In The Collector-current For A Change Of  in Its Base-current? What Will Be The Change In The Emitter-current? 

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The a-c current gain  of a transistor is 150. What will be the change in the collector-current for a change of  in its base-current? What will be the change in the emitter-current? 


Correct option is

15 mA, 15.1 mA


By definition, the alternating-current gain  is given by 




             = 15 mA

The emitter-current is  




             = 0.1 mA + 15 mA

             = 15.1 mA.



An n-type and a p-type silicon can be obtained by doping pure silicon with : 


An n-type semiconductor is :


The drift current in a p-n junction is :


The diffusion current in a p-n junction is 


In a p-n-p transistor with normal bias:


The base-current of a transistor is  and the collector-current is 2.05 mA. A change of  in the base-current produces a change of 0.65 mA in the collector current. Find .  


The current-gain of a transistor in a common-base arrangement is 0.98. Find the change in collector-current corresponding to a change of 5.0 mA in emitter-current. What would be the change in the base-current?


In a common-base amplifier the load-resistance of the output circuit is  and the resistance of the input circuit is . If current-gain be 0.95, calculate the voltage-gain and the power gain.


In input and output resistances in a common-base amplifier circuit are  respectively. If the current-gain  is 0.98, then find the voltage gain. If the emitter-current is 2 mA, then find the collector-current and the base-current. 


Find the voltage gain and power gain in a transistor amplifier in common-emitter configuration when  and the input and the output ersistance are .