LONG ANSWER QUESTIONS
UNIT-I, DIODES
1. Draw and explain the V-I Characteristics of a P-N Diode with a neat diagram?
2. Write about static and dynamic resistances
3. Explain the operation of a PN Junction Diode in Forward Bias and Reverse Bias with neat diagrams
4. How diode acts as a switch? Explain.
5. List the differences between Transition and Diffusion Capacitance of a P-N diode
6. Describe about diffusion and transition capacitances.
7. Discuss the Diode Switching Times in detail with neat diagrams.
8. Discuss an open circuited PN junction diode.
9. Derive the expression for diode current equation.
10. Write about diode switching times.
11. Discuss the VI characteristics of a PN junction diode.
UNIT-II, DIODE APPLICATIONS
1. Explain the operation of Bridge rectifier with neat diagrams and derive the expression for ripple factor and effiency.
2. Explain the operation of HWR with the help of neat diagrams and also derive the Efficiency and Ripple Factor?
3. Explain the working principle of a Full Wave Rectifier with necessary wave forms?
4. Draw the circuit diagram of different clipper circuits and sketch their input and out waveforms.
5. Write about positive and negative clipping circuits.
6. State and prove clamping circuit theorem.
7. Derive the expression for ripple factor and efficiency for half wave and full wave rectifiers.
UNIT-III, BIPOLAR JUNCTION TRANSISTOR (BJT)
1. Explain the working principle of NPN transistor.
2. How transistor act as a switch? Explain.
3. Define clipping and clamping circuits. Differentiate clipping and clamping circuits?
4. Explain about the applications of BJT transistor
5. Discuss transistor switching times.
6. Explain the construction and working of NPN and PNP transistors.
7. Explain the operation of BJT in Common Emitter Configuration with the help of Input and Output Characteristics.
8. Explain the working principle of a transistor Common Collector Configuration with neat circuit diagram. Also discuss the Input and Output characteristics of CC Configuration.
9. With necessary waveforms explain transistor switching characteristics
10. Draw the circuit and explain the input and output characteristics of CE transistor configuration.
11. Explain how transistor acts as a switch and also transistor switching times.
UNIT-IV, JUNCTION FIELD EFFECT TRANSISTOR (FET)
1. Describe briefly the construction and principle of operation of a FET.
2. Compare between BJT and JFET
3. Explain the operation of FET as a variable resistor.
4. Compare Bipolar Junction Transistor & Field Effect Transistor?
5. Explain the working of MOSFET.
6. Define rd, gm and μ. Also derive the relationship among them.
7. Explain the construction and working principle of Enhancement mode n-channel MOSFET and draw its drain and transfer characteristics with neat diagrams.
8. Explain the construction of JFET and its transfer characteristics with neat diagram.
9. Write about pinch off voltage.
10. Explain the construction and principle of operation of n-channel JFET and draw its characteristics with neat diagrams.
11. Describe the construction and working principle of UJT with its equivalent circuit and its V-I characteristics
UNIT-V, SPECIAL PURPOSE DEVICES
1. Explain the structure, equivalent circuit, and characteristics of SCR.
2. Write short notes on the following with neat symbols a) Varactor diode. b) UJT.
3. Explain the working principle and characteristics of LED with neat diagram and mention its applications.
4. Write short notes on Schottky Barrier Diode
5. With a neat sketch explain the characteristics of SCR.
6. Explain the construction and working principle of Operation of SCR.
7. Explain the working principle and characteristics of Photo Diode with neat diagram and mention its applications.
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