Question

In a silicon transistor, a change of 0.02 V in base-to-emitter voltage produces a change of  in the base-current and a change of 2 mA in the collector-current. Find the input resistance , the alternating current gain  and the trnsconductance of the resistor. If the transistor is used as an amplifier with a load resistance of , find the voltage gain and the power gain of the amplifier. 

Solution

Correct option is

The input resistance is 

       

              

              

The alternating-current gain is 

       

                       

                       

                       = 100. 

The transconductance is 

       

             

               

In common-emitter circuit, the a-c voltage gain is  

       

             

             = 500. 

The a-c power gain is 

         

       

       

       .

SIMILAR QUESTIONS

Q1

The decreasing order of band gap energy is :

Q2

In the case of constants  of a transistor :

Q3

An ac voltage of peak value of 20 V is connected in series with a silicon diode and a load resistance of . The forward resistance of the diode is  and the barrier voltage is 0.7 V. Find the peak current through diode and the peak voltage across the load. What will happen to these values if the diode is assumed to be ideal?   

Q4

A transistor is connected in common emitter (CE) configuration. The collector supply is 8 V and the voltage drop across a resistor of  in the collector circuit is 0.5 V. If the current gain factor  is 0.96, find the base current.  

Q5

The plate current Ip, in triode value is give by 

         

Where Ip is in milliampere and Vp and Vg are in volt. Calculate the value ofk and the grid cut-off voltage. Given, 

 milliampere are 

Q6

A semiconductor has an electron concentration of  and a hole concentration of . Calculate its conductivity. Given electron mobility = 0.135 m2V–1s–1; hole mobility = 0.048 m2V–1s–1.

Q7

The electric conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. Find the hand gap of the semiconductor. Given, 

  

 

Q8

Diamond, silicon and germanium each are characterised  by valence and conduction bands separated by energy band gaps respectively equal to . Which of the following statements is true?

Q9

The input resistance of a common-emitter amplifier is  and a-c current gain is 20. If the load resistor used is , calculate transconductance of the transistor used.  

Q10

In a transistor, the base-current is changed by . This result in a change of 0.01 V in base to emitter voltage, and a change of 1.0 mA in the collector-current Find the current gain