Fundamentals of Electronics Engineering Unit 2 – Transistors — BJT and FET: important questions for AKTU
Unit 2 (Transistors — BJT and FET) questions that AKTU repeats most often. This unit carries about 25 marks per paper. Start with the repeated questions, then the most asked topics.
Most repeated Unit 2 questions
- 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) – also asked in 2022, 2023, 2024, 2026
- Draw the Structure of Depletion type N-MOSFET. Explain its operation with characteristic graph. (10 marks, 2022, MOSFET Types and Characteristics) – also asked in 2023, 2024, 2025, 2026
- Describe the construction and working of P-Channel Depletion MOSFET, with characteristic graph. Also justify that it is a voltage controlled device. (10 marks, 2022, MOSFET Types and Characteristics) – also asked in 2022, 2024, 2025, 2026
Most important Unit 2 topic
- Bipolar Junction Transistor (Unit 2: Transistors — BJT and FET) – asked 18 times in 2022, 2023, 2024, 2025, 2026
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
More 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)
Unit 2 syllabus topics
- Bipolar Junction Transistor
- Junction Field Effect Transistor
- MOSFET Types and Characteristics