The top 30 most frequently Important questions Electrical and Electronic Circuit
1. State and explain Thevenin’s theorem.
2. Explain V-I characteristics of a P-N junction diode.
3. State and explain Norton’s theorem.
4. Derive the relationship between α and β of a transistor.
5. Explain the working principle of a full-wave bridge rectifier with a diagram.
6. List the characteristics of an ideal operational amplifier.
7. Compare Common Base (CB) and Common Emitter (CE) transistor configurations.
8. Explain the construction and operation of an N-channel JFET.
9. Define resonance frequency and Q-factor in a series RLC circuit.
10. Describe input/output characteristics of a Common Emitter (CE) BJT configuration.
11. Explain the advantages and disadvantages of negative feedback.
12. What is doping? Explain how P-type and N-type semiconductors are formed.
13. Describe the operation of a half-wave rectifier with a diagram.
14. Explain how a transistor acts as a switch.
15. Define DC load line and Q-point of a transistor.
16. Explain the working principle of an enhancement-type MOSFET (N-channel).
17. State and explain Kirchhoff’s Current Law (KCL) and Voltage Law (KVL).
18. Explain the operation of a zener diode as a voltage regulator.
19. How does an op-amp work as an integrator? Explain the circuit.
20. Describe the working principle of a Hartley oscillator.
21. Define RMS value and form factor of an AC signal.
22. Explain the effect of temperature on semiconductor resistance.
23. What is the maximum power transfer theorem? State and explain.
24. Explain the operation of an op-amp as a summing amplifier.
25. Compare depletion-mode and enhancement-mode MOSFETs.
26. Define CMRR and slew rate of an op-amp.
27. Explain the voltage divider rule with a diagram.
28. What is a clipper and clamper circuit? Define with examples.
29. Describe the working principle of an LED with construction.
30. Explain the operation of a Silicon Controlled Rectifier (SCR).
### Key Observations:
– **Network Theorems** (Thevenin/Norton/Superposition) and **PN Junction Diode** are the most repeated topics (90–95% Important).
– **Transistor Configurations** (CE/CB), **Rectifiers**, and **Op-Amp Applications** appear in 75–85% of exams.
– Questions marked”State and explain” or “Derive/Explain with diagrams” dominate high-frequency importance.