Transistor Characteristics

1) What is transistor? what are the types of transistors?
Ans: Transistor is a three terminal semiconductor device.
 There are two types of semiconductor i.e,. n-p-n and p-n-p.

2) Define n-type and p-type semiconductors.
Ans: If an intrinsic semiconductoris doped with pentavalent impurity. Then it is called n-type semiconductors.
If it is doped with trivalent impurity then it is called p-type semiconductor.
 
3) What is doping?
Ans: Adding trivalent or pentavalent impurity to an intrinsic semiconductor is called doping.

4. What are three basic transistor connection modes? Which mode is most preferred? Why?
Ans: Common-Emitter, Common-Base & Common-Collector connections.
 CE mode is most preffered because CE modes gives Highest voltage gain.

5. Define current amplification factor of a transistor?
Ans: It is defined as ratio of change in collector current to change in base current.

7. What is the biasing rule of transistor?
Ans: Emitter base junction should be forward biased and collector base junction should be reversed biased.

8. What is semiconductor?
Ans: Semiconductor is a substancewhich has the resistivityin between that of conductor and insulator. semiconductor has negative temperature coefficient of resistance.

9) Which are the commonly used semiconductors?
Ans: Germanium & Silicon