Fundamentals of Electronics Engineering (BEC101) AKTU previous year questions 2022–2026
Every Fundamentals of Electronics Engineering question from 8 AKTU papers, tagged by unit, topic and marks. A few recent questions from each unit are listed below; open the page to filter by unit, topic or mark type.
Unit 1: Semiconductor Diode and Applications – AKTU PYQs
- 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)
Unit 2: Transistors — BJT and FET – AKTU PYQs
- 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 3: Operational Amplifiers – AKTU PYQs
- Define CMRR, Slew Rate, and PSRR of Operational Amplifier. (2 marks, 2026, Op-Amp Fundamentals)
- Describe the structure of an operational amplifier using a block diagram and explain each stage in detail? Draw the circuit diagram of differential amplifier using op-amp and find out the expression for output voltage. (7 marks, 2026, Op-Amp Fundamentals)
- (i) Write the comparison between Inverting and Non-inverting Op-Amp. (ii) Describe the Differentiator and Integrator operation of amplifier and also formulate its overall output voltage. (7 marks, 2026, Integrator and Differentiator)
- Determine the output voltage of the given following networks. (for figure-1 V1=0.2v and V2=0.5v) (for figure-2 V1=10v and V2=15v) (7 marks, 2026, Linear Op-Amp Circuits)
- Why is a differential amplifier configuration preferred as the input stage of an op-amp? (2 marks, 2025, Op-Amp Fundamentals)
Unit 4: Digital Electronics – AKTU PYQs
- What are the basic laws and theorems of Boolean algebra? (2 marks, 2026, Boolean Algebra Simplification)
- Determine base of the following: (i) (211)X = (152)8 (ii) (193)X = (623)8. (2 marks, 2026, Number Systems and Arithmetic)
- Simplify the function F= ∑m(0,3,5,7,8,9,10,12,13) + ∑d(1,6,11,14) using K-map and also implement the simplified expression using Basic gates only. (7 marks, 2026, K-Map Minimization)
- Perform following operation as indicated:- (i) Convert (472.254)8 to its decimal value (ii) Subtract using 1's complement: (10111)2 - (110011)2. (iii) Calculate the 1's and 2's complement of binary number 1010101. (iv) Subtract using 2's complement: (1010)2 – (0101)2. (v) Convert (5678)10 into BCD. (7 marks, 2026, Number Systems and Arithmetic)
- (i) Define universal logic Gates. Realize XOR, XNOR gates using NAND and NOR gate only. (ii) Prove the following Boolean functions: AB+ABC+AB̄=A and AB̄+ĀB+AB+ĀB̄=1 (7 marks, 2026, Basic and Universal Gates)
Unit 5: Fundamentals of Communication Engineering – AKTU PYQs
- Define modulation index for AM wave. State the concept of over, under modulation. (2 marks, 2026, Amplitude Modulation)
- A 320W carrier is simultaneously modulated by two audio waves with percentage modulation of 45 and 60 respectively. What is the sideband power radiated? (2 marks, 2026, Amplitude Modulation)
- (i) Define Modulation and also Listed the need of modulation in communication. (ii) When an AM broadcast transmitter is 60% modulated then its antenna current is 10A.what will be the antenna current when the modulation depth is Increased by 70%. (7 marks, 2026, Amplitude Modulation)
- Derive an expression for Amplitude Modulated wave. An audio frequency signal 20sin (2π ×500t) is used to amplitude modulated a carrier of 40sin (2π ×105t). Calculate (i) Modulation index (ii) Amplitude and frequency of each side band (iii) Bandwidth. (7 marks, 2026, Amplitude Modulation)
- What is Wireless Communication? Explain the basic principles of Satellite Communication system with the help of block diagram. Also state the advantages and disadvantages of Wireless Communication. (7 marks, 2026, Wireless Communication Overview)