Fundamentals of Electronics Engineering Unit 2 – Transistors — BJT and FET: AKTU previous year questions
41 AKTU questions from Unit 2 (Transistors — BJT and FET) asked in 2022–2026, tagged by marks, year and topic. In short: about 25 marks of every paper come from this unit; the most asked topic is Bipolar Junction Transistor (18 times); 38 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 2 previous year questions
- Derive relation between current gain in CB and CE configuration of transistor. For a transistor IE = 10mA and α= 0.987. find value of IC. (2 marks, 2026, Bipolar Junction Transistor)
- (i) Explain the input and output characteristics of a transistor in CE configuration. (ii) A JFET has parameters of VGS (off) is equal to -20V and IDSS equal to 12 mA. Plot the transconductance curve for the device using VGS values of 0V, -5V, -10V, -15V, and -20V. (7 marks, 2026, Junction Field Effect Transistor)
- Describe the construction and working of N-Channel depletion type MOSFET along with their transfer characteristics. (7 marks, 2026, MOSFET Types and Characteristics)
- Write the only 5 differences between BJT and JFET. Draw and explain the construction and working of N-Channel JFET with suitable diagram and also draw its characteristic graphs. (7 marks, 2026, Junction Field Effect Transistor)
- What is the physical significance of the pinch-off voltage in a JFET, and how does it affect drain current? (2 marks, 2025, Junction Field Effect Transistor)
- Why are FETs known as unipolar and voltage-controlled devices? (2 marks, 2025, Junction Field Effect Transistor)
- Explain the construction and working of a BJT. Draw the input and output characteristics of Common Emitter configuration. (7 marks, 2025, Bipolar Junction Transistor)
- Why is common collector mode generally not preferred? Increase in collector emitter voltage from 5V to 8V causes increase in collector current from 5mA to 5.3mA. Determine the dynamic output resistance. (7 marks, 2025, Bipolar Junction Transistor)
- Discuss the working of JFET and also discuss input and output characteristics of JFET. (7 marks, 2025, Junction Field Effect Transistor)
- Explain, why is enhancement MOSFET preferred over depletion MOSFET for switching purposes? (7 marks, 2025, MOSFET Types and Characteristics)
- Derive the relation between α and β. Calculate Ic and IE for a transistor that has αdc = 0.98 and Ic =100μA. Determine the value of βdc for the transistor. (7 marks, 2025, Bipolar Junction Transistor)
- In CB configuration, the value of α=0.98A. A voltage drop of 4.9V is obtained across the resistor of 5KΩ when connected in collector circuit. Find the base current. (7 marks, 2025, Bipolar Junction Transistor)
Most asked Unit 2 topics
- Bipolar Junction Transistor – asked 18 times
- Junction Field Effect Transistor – asked 13 times
- MOSFET Types and Characteristics – asked 10 times
Unit 2 question pattern
- 2-mark questions: 15 asked in 2022–2026
- 7-mark questions: 20 asked in 2022–2026
- 10-mark questions: 6 asked in 2022–2026
- About 25 marks from Unit 2 in every paper
- 38 questions were asked again in a later year
Unit 2 questions year by year
- 2026: 4 Unit 2 questions asked (23 marks across that year's papers)
- 2025: 8 Unit 2 questions asked (46 marks across that year's papers)
- 2024: 9 Unit 2 questions asked (48 marks across that year's papers)
- 2023: 9 Unit 2 questions asked (43 marks across that year's papers)
- 2022: 11 Unit 2 questions asked (70 marks across that year's papers)