Question

The current gain for common-emitter amplifier is 59. If the emitter-current is 6.0 mA, find (i) base-current, and (ii) collector-current.

Solution

Correct option is

The d-c current gain in common-emitter transistor circuit is given by 

             

.  

  

Now, the sum of base-current iB and collector-current iC equals the emitter-current iE, that is,  

             

Solving eq. (i) and (ii), we get  

           .   

SIMILAR QUESTIONS

Q1

When a forward bias is applied to a p-n junction, it :

Q2

The resistance of a forward-biased p-n junction is :

Q3

When a semiconductor device is connected with a battery and a resistance in series, a current flows in the circuit. The current almost vanishes if the polarity of the battery is reversed. The device may be :

Q4

The circuit contains two diodes, each with a forward resistance of  and with infinite backward resistance. If the battery voltage is 6 V, the current through the  resistance is  

                                                                        

Q5

Two identical p-n junction may be connected in series with a battery in three ways. The potential drops across the two p-n junction are equal in :

                                

Q6

In case of p-n junction diode at high reverse-bias, the current rises sharply. The value of reverse bias is known as : 

Q7

A junction diode can be used for :

Q8

p-n junction diode cannot be used :

Q9

For a common base transistor circuit, the emitter-current and the collector-current are 1 mA and 0.96 mA respectively. Calculate the current gain and base current.

Q10

Calculate the current gain  of a transistor if the current-gain  is 0.98.