CHAPTER 13
Answer all Questions ( 4 Marks question)
1. Name the two universal gates. Give their symbols and truth tables.
2. Draw a circuit, consisting of an AND gate, a resistor and an LED to investigate
the output the AND gate. When A is logic 1 and B is logic 0, will the LED light
up?
3. What is a p-n junction diode? How can the p-n junction be obtained? Draw
the structure, symbol and I-V graph of the p-n junction diode.
4. What is a semiconductor? Give example. What is the charges carrier in
metals and semiconductors? Can semiconductor diode be used as a rectifier?
5. What is thermionic emission? Explain Edison effect.
6. Draw a half wave rectifier circuit and describe the function of the half-wave
rectifier.
7. Draw a fire alarm circuit using logic gate explain its function.
8. What are vacuum diode and triode? Draw neat diagrams of the structure of
diode and triode.
9. What is a transistor? What are they? Name three electrodes of transistors.
Draw the kinds of transistors and their respective circuit symbols.
10.Draw biasing circuit diagrams of p-n-p and n-p-n transistors.
11.Suggest how 4 NAND gates can be connected to behave as a NOR gate.
construct a stage by stage to confirm its action.
12. Explain how transistor can be used current amplifier and power amplifier.