Question

A common-emitter transistor amplifier has a current gain of 50. The collector resistance is  and the input resistance is , calculate the output voltage if input voltage is 0.01 V. 

Solution

Correct option is

2.5 V

In common-emitter amplifier, the voltage gain is given by 

             

where Rout is the output resistance (here Rout = collector resistance) andRin is the input resistance of the circuit.     

                 = 250. 

  

                            .

SIMILAR QUESTIONS

Q1

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  

                                                                        

Q2

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 :

                                

Q3

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

Q4

A junction diode can be used for :

Q5

p-n junction diode cannot be used :

Q6

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.

Q7

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.

Q8

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

Q9

In a silicon transistor, a change of 7.98 mA in the emitter-current produces a change of 7.8 mA in the collector-current. Find the required change in the base current to produce an equivalent change in the collector current. 

Q10

The internal resistance of a triode value is  and the amplification factor is 15. What is the potential (at constant-potential) is required to increase the plate current from 6 mA to 9 mA?