This question paper is designed for a B.Tech (Semester Exam) and focuses on evaluating students' understanding of Basic Electronics, including semiconductor theory, diode applications, BJT/JFET/MOSFET behavior, operational amplifier circuits, measurement systems, and CRO/DMM fundamentals.
The paper is divided into three sections, each testing different levels of knowledge:
SECTION A – Short Answer Questions (20 Marks)
This section contains 10 short questions, each carrying 2 marks.
It tests conceptual understanding of:
Semiconductor basics (doping, diode capacitance, dark current)
Special diode operations (Zener, Tunnel diode)
JFET operation
BJT switching mode
Operational amplifier parameters (CMRR, voltage follower)
Digital vs. analog meters
CRO fundamentals (Lissajous patterns)
Students must answer all questions briefly and correctly.
SECTION B – Descriptive / Analytical Questions (30 Marks)
Students must attempt any three out of five questions (each 10 marks).
This section checks the ability to:
Draw and interpret V–I characteristics of diodes
Explain full-wave rectifier with center-tapped transformer (with efficiency)
Analyze CE transistor characteristics and justify preference
Derive Op-amp based integrator, differentiator, subtractor circuits
Explain construction & working of Digital Multimeters with block diagrams
Answers should include neat circuit diagrams, characteristics, equations, and proper explanation.
SECTION C – Long Answer / Problem-Solving (50 Marks)
This section contains five questions, each with two choices, and each question carries 10 marks.
It evaluates deeper understanding of:
LED-based output calculation / Voltage doubler circuits
Tunnel diode & varactor diode working
Q-point calculation of BJT / MOSFET characteristics
Op-amp adder design & output calculation
Ramp-type digital voltmeter / CRO applications
Students must answer one part from each question, demonstrating analytical clarity and proper circuit interpretation.
