This question paper evaluates a student’s theoretical and analytical understanding of basic electronic devices, circuits, number systems, operational amplifiers, modulation techniques, and digital logic design.
The paper can be answered in Hindi, English, or mixed language, making it flexible and student-friendly.
The paper is divided into three sections—A, B, and C—covering conceptual, numerical, and diagram-based questions.
SECTION A – Short Answer Questions (2 × 7 = 14 Marks)
This section contains seven brief questions, each testing essential concepts in electronics:
Avalanche Breakdown vs Zener Breakdown
Difference in mechanism, operating region, doping level, and temperature behavior.
Varactor (Varicap) Diode
Reason it is called “variable capacitance diode”.
Pinch-off Voltage
Definition of pinch-off condition in JFET.
Transistor Current Relations
Using α, IE to calculate IC and IB.
CMRR & Slew Rate of Op-Amp
Definitions of two important parameters in operational amplifiers.
Voltage Follower
Use of op-amp for unity gain buffer.
Power in AM Wave
Calculation of total power using carrier power & modulation index.
This section checks foundation-level clarity of semiconductor and analog electronics.
SECTION B – Descriptive Questions (7 × any 3 = 21 Marks)
Students must answer any three detailed questions. Topics include:
p-n Junction Diode
Working principle and V–I characteristics with graph.
Bridge Rectifier
Neat circuit diagram, waveform explanation, and calculation of average voltage & current.
Output Voltage Calculation
Numerical question using circuit analysis (based on given Fig.1).
Universal Gates
Definition and implementation of AND, OR, NOR gates using only NAND gate.
AM (Amplitude Modulation) Numerical
Calculation of:
Modulation Index
Sideband frequencies
Sideband amplitudes
Bandwidth
Total transmitted power
This section evaluates understanding of circuit diagrams, waveforms, digital logic, and communication principles.
SECTION C – Long Answer / Analytical Questions (7 × 3 = 21 Marks)
Students answer one question from each part (3, 4, 5, 6, 7). These require detailed explanations, diagrams, and derivations.
PART 3
(a) Voltage Tripler circuit diagram & Zener diode as voltage regulator
or
(b) Working principles of LED and Photodiode with diagrams.
PART 4
(a) NPN Transistor in Common-Base configuration
Circuit diagram, working, input-output characteristics
or
(b) Depletion-Type MOSFET (n-channel)
Construction, working, and detailed characteristics.
PART 5
(a) Block diagram of Operational Amplifier & Ideal Characteristics
or
(b) Op-Amp as Integrator & derivation of output equation.
PART 6
(a) Boolean Function Minimization using K-Map
Implement simplified logic using gates
or
(b) Number System Conversions
Binary, decimal, octal, base conversion, 1’s and 2’s complement arithmetic.
PART 7
(a) AM Modulator & Block Diagram of Communication System
or
(b) Block Diagrams & Working of Satellite System and Radar System.
