Question

When a television set (scientifically known as a television receiver) is opened, many components like semiconductor diodes, transistors, capacitors, resistors etc. can be observed on its motherboard. There are different types of diodes like photo diode, Zener diode, LED etc. found in the T.V. set. With the help of these components, a television receives audio as well as video signals.

1. A semiconductor diode has two types of semiconducting materials: ‘P’ type and ‘N’ type. What is the difference between them?    [2]
2. Draw a labelled diagram of a full wave rectifier. Show graphically how its output voltage varies with time.    [2]
3. What type of diode can be used as a voltage regulator?    [1]

Answer 1

1. N-type semiconductors are produced by incorporating a pentavalent impurity, while P-type semiconductors are created by introducing a trivalent impurity into a pure intrinsic semiconductor.
   N-type semiconductors have elevated electron conductivity, while P-type semiconductors demonstrate enhanced hole conductivity.
2. 
   
3. A Zener diode can be used as a voltage regulator.