Fundamentals of Electronics Engineering Unit 1 – Semiconductor Diode and Applications: AKTU previous year questions
42 AKTU questions from Unit 1 (Semiconductor Diode and Applications) asked in 2022–2026, tagged by marks, year and topic. In short: about 26 marks of every paper come from this unit; the most asked topic is Special Purpose Diodes (15 times); 37 questions came back in a later year. The latest ones are listed below; on the page you can filter them by 2-mark or long questions, topic and repeats.
Unit 1 previous year questions
- What do you mean by Doping? Compare between Clipper and Clamper Circuit. (2 marks, 2026, Clippers and Clampers)
- (i) Explain the working of p-n junction diode and draw its V-I Characteristics. (ii) Sketch the output voltage waveform for the given circuit. Assume ideal diode used. (7 marks, 2026, Semiconductor Diode Fundamentals)
- Write difference between half wave and Full wave (Centre tap) rectifiers. Draw a neat circuit diagram of bridge rectifier and explain its operation with output waveforms. Drive the average value of current. (7 marks, 2026, Rectifier Circuits)
- (i) What is voltage multiplier circuit? Draw the circuit diagram of voltage tripler circuit. (ii) Explain the working and V-I characteristics of LED with the help of suitable diagram. (7 marks, 2026, Special Purpose Diodes)
- Compare Avalanche and Zener breakdown. (2 marks, 2025, Special Purpose Diodes)
- Why does the depletion region width decrease after putting diode in forward bias? (2 marks, 2025, Semiconductor Diode Fundamentals)
- What is negative resistance on tunnel diode? (2 marks, 2025, Special Purpose Diodes)
- Explain the formation of a PN junction and derive the expression for the width of the depletion region. Discuss how biasing affects the junction width. (7 marks, 2025, Semiconductor Diode Fundamentals)
- For the circuit shown in Fig. find the maximum and minimum values of zener diode current. (Circuit: 80–120V supply, R=5kΩ, Vz=50V, RL=10kΩ) (7 marks, 2025, Special Purpose Diodes)
- Compare and analyze the operation and waveforms of half-wave and full-wave rectifiers. Include derivations for average and RMS current. (7 marks, 2025, Rectifier Circuits)
- An a.c. supply of 230 V is applied to a half-wave rectifier circuit through a transformer of turn ratio 10 : 1. Find (i) the output d.c. voltage and (ii) the peak inverse voltage. Assume the diode to be ideal. (7 marks, 2025, Rectifier Circuits)
- A full-wave bridge rectifier is supplied with 220V AC, 50Hz. It uses a transformer with turns ratio 10:1 and a filter capacitor of 470 μF. Calculate: • Peak output voltage • Average DC output voltage • Ripple voltage for a load of 1 kΩ (7 marks, 2025, Rectifier Circuits)
Most asked Unit 1 topics
- Special Purpose Diodes – asked 15 times
- Clippers and Clampers – asked 10 times
- Semiconductor Diode Fundamentals – asked 9 times
Unit 1 question pattern
- 2-mark questions: 14 asked in 2022–2026
- 7-mark questions: 22 asked in 2022–2026
- 10-mark questions: 6 asked in 2022–2026
- About 26 marks from Unit 1 in every paper
- 37 questions were asked again in a later year
Unit 1 questions year by year
- 2026: 4 Unit 1 questions asked (23 marks across that year's papers)
- 2025: 9 Unit 1 questions asked (48 marks across that year's papers)
- 2024: 9 Unit 1 questions asked (48 marks across that year's papers)
- 2023: 10 Unit 1 questions asked (55 marks across that year's papers)
- 2022: 10 Unit 1 questions asked (68 marks across that year's papers)