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In an n-p-n transistor, 1010 electrons enter the emitter in 10–6 s. 2% of the electrons are lost in the base. Calculate the current transfer ratio and the current amplification factor. Charge on electron is .


A transistor is connected in common-emitter 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.  


p-n-p transistor is used in common-emitter mode in an amplifier circuit. A change of  in the base-current brings a change of 2 mA in collector-current and of 0.04 V in base-emitter voltage. Find the input resistance  and the base-current amplification factor . If a load resistance of  is used, then find the voltage-gain of the amplifier. 


A transistor has three impurity regions. All the three regions have different doping levels. In order of increasing doping level, the regions are :


When the emitter current of a transistor is changed by 1 mA, its collector current of a transistor is changed by 0.990 mA. The common base circuit current gain for the transistor is :


In case of n-p-n transistor the collector current is always less than the emitter current because :


Transistors are :


Which one of following gates can be served as a building block for any digital circuit? 


The decreasing order of band gap energy is :


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?