ENEX 151Bachelor in Electronics, Communication and Information Engineering · Semester 21 Paper Available

Electronic Device and Circuits

Past examination question papers and complete curriculum syllabus for Electronic Device and Circuits (ENEX 151), Bachelor in Electronics, Communication and Information Engineering Semester 2 under Institute of Engineering (IOE), Tribhuvan University.

Sem 2 Subjects (6)View Full Semester Overview →

ENSH 151Engineering Mathematics II ENCT 151Object Oriented Programming ENEX 151Electronic Device and Circuits ENEX 152Digital Logic ENEE 154Electrical Circuits and Machines ENSH 153Engineering Chemistry

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Past Question Papers (PDF)

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2nd-sem_Electronic Device and Circuits.pdf

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Most Frequently Asked Questions

Top recurring IOE board exam questions for Electronic Device and Circuits with verified mark schemes, formula notation, and recurrence frequency.

Showing 40 of 40 top repeated questions

5 Chapters · Click any chapter to expand

Year-wise & Session-wise Exam Papers

Complete questions from each exam session (Regular & Back exams from 2082 to 2069) for Electronic Device and Circuits. Click any session paper to expand.

Showing 300 questions across 21 exam session papers

Institute of Engineering • 2083 Baishakh Board Examination

Q1[2 Marks]The Bipolar Junction Transistor (BJT)

Draw the small signal model of voltage divider bias for emitter bypassed capacitor CE amplifier circuit and find its input impedance, output impedance and voltage gain.

Q2[2 Marks]The Bipolar Junction Transistor (BJT)

Draw the ac equivalent circuit for a CE amplifier (emitter resistor unbypassed) and derive the expressions for voltage gain, input impedance.

Q3[6 Marks]Operational Amplifier Circuits and Oscillator

Draw Wien Bridge oscillator circuit and derive the expression for frequency of oscillation and gain of amplifier circuit.

Q4[7 Marks]Output Stages and Power Amplifiers📐 Diagram in Paper

Draw the circuit diagram of class A series fed amplifier and its corresponding characteristic graph. And, find its general efficiency.

Q5[2 Marks]Output Stages and Power Amplifiers📐 Diagram in Paper

Draw the circuit diagram of class A series fed amplifier and its corresponding characteristic graph. And, find its general efficiency.

Q6[4 Marks]Power Supplies, Breakdown Diodes, and Voltage Reference

Derive the expression for stability factor of a discrete-transistor series regulator.

Q7[4 Marks]Power Supplies, Breakdown Diodes, and Voltage Reference

Design a DC voltage regulator for

6 V

15 V

output using LM317.

Q8[1 Marks]Field-Effect Transistor

Design

β

independent type dc biased common collector amplifier, and find its current gain and input resistance. Given parameters:

V_{C C} = 20 VDC

I_{C} = 2 mA

and

β = 100

and use firm biasing method.

Q9[6 Marks]Field-Effect Transistor

Describe the construction and working principle of n channel enhancement-type MOSFET with the help of necessary diagrams and its drain characteristic curve.

Q10[1 Marks]The Bipolar Junction Transistor (BJT)📐 Diagram in Paper

What is the main difference between RC and LC oscillator circuits in terms of application? Explain the operation of Wien Bridge Oscillator circuit with the help of circuit diagram and necessary mathematical expressions.

Q11[5 Marks]Field-Effect Transistor

Explain how a base current compensation circuit reduces the difference between

I_{0}

and

I_{R E F}

in a simple current mirror circuit.

Q12[6 Marks]The Bipolar Junction Transistor (BJT)

For a class B amplifier providing a

20 V

peak signal to a

16 Ω

load (speaker) and a power supply of

V_{C C} = 30 V, d e t er min e

the input power, output power, and circuit efficiency.

Q13[4 Marks]Power Supplies, Breakdown Diodes, and Voltage Reference

Design a 5V to 20V variable dc voltage regulator using LM317.

Q14[6 Marks]The Bipolar Junction Transistor (BJT)

Explain different large signal models of pn junction diodes.

Q15[6 Marks]Operational Amplifier Circuits and Oscillator

Design DC voltage regulator for

6 V

output. Given data are

V_{z} = 6 V

I_{z} = 20 mA

I_{z k} = 2 mA

P_{z ma x} = 500 mw

and

r_{z} = 10Ω

. The nominal input voltage is

15 V \pm 30%

DC. Find maximum current it can delivers to the load.

Q16[8 Marks]The Bipolar Junction Transistor (BJT)

Design a common base amplifier circuit using

β

independent method. Given parameters are

V_{C C} = 22 V, I_{E} = 1.5 mA, β = 110

and input and output impedances are comparatively large. Use appropriate guidelines to support your design.

Q17[4 Marks]The Bipolar Junction Transistor (BJT)

Explain the operation of BJT as a switch.

Q18[7 Marks]The Bipolar Junction Transistor (BJT)

Describe the construction and working principal of DMOSFET with the help of drain characteristics curve, transfer characteristics curve and mathematical expression.

Q19[6 Marks]Output Stages and Power Amplifiers📐 Diagram in Paper

Draw the circuit diagram of Class A tuned amplifier and determine the range of frequency in which it gives maximum gain within

3 dB

range.

Q20[8 Marks]Operational Amplifier Circuits and Oscillator📐 Diagram in Paper

Define the term multivibrator. Explain the operation of op-amp based astable multivibrator for square wave with the help of circuit diagram and waveforms and also determine its frequency of oscillation.

Q21[6 Marks]Power Supplies, Breakdown Diodes, and Voltage Reference

Draw the series dc voltage regulator with current limiting element and explain how it works.

Curriculum Syllabus & Course Topics

Sourced from TU curriculum portal

Full Syllabus (PDF)

Chapter-wise Units & Micro-Syllabus Topics (5 Units)

1. The Bipolar Junction Transistor (BJT)
- 1.1Review of operation of the npn transistor in the active mode
- 1.2Review of graphical representation of transistor characteristics
- 1.3Analysis of transistor circuits at DC
- 1.4Graphical DC load line analysis
- 1.5Transistor as an amplifier ( r , r g )  e, m
- 1.6Biasing BJT for discrete-circuit design
- 1.7Small signal equivalent circuit models ( and T)
- 1.8Basic single-stage BJT amplifier configuration (C-B, C-E, C-C)
- 1.9Small signal analysis of amplifier
- 1.10Transistor as a switch – cutoff and saturation
- 1.11A general large-signal model of the BJT: The Ebers-Moll model
2. Field-Effect Transistor
- 2.1Structure and physical operation of the junction field-effect transistor
- 2.2Structure and physical operation of enhancement-type MOSFET
- 2.3Current-voltage characteristic of enhancement-type MOSFET
- 2.4The depletion-type MOSFET
- 2.5Biasing in MOS amplifier circuits
- 2.6MOSFET circuits at DC
- 2.7MOSFET as an amplifier (Common source)
- 2.8MOSFET and CMOS as logic circuits
3. Operational Amplifier Circuits and Oscillator
- 3.1Review of basic principles of sinusoidal oscillator
- 3.2Review of Op-Amp square and triangular, RC oscillator circuits
- 3.3LC and crystal oscillators
- 3.4Integrated circuit timers
- 3.5Precision rectifier circuits
- 3.6Bias circuits suitable for IC design
- 3.7The Widlar current source
- 3.8The differential amplifier
- 3.9Active loads
- 3.10Output stages
4. Output Stages and Power Amplifiers
- 4.1Classification of output stages
- 4.2Class A output stage
- 4.3Class B output stage
- 4.4Class AB output stage
- 4.5Biasing of class AB output stage
- 4.6Power BJT’s
- 4.7Transformer-coupled push-pull stage
- 4.8Tuned amplifiers
5. Power Supplies, Breakdown Diodes, and Voltage Reference
- 5.1Unregulated power supply
- 5.2Zener regulated power supply
- 5.3Zener diodes, bandgap voltage reference, constant current diodes
- 5.4Transistor shunt/series voltage regulator
- 5.5Improving voltage regulator performance with feedback
- 5.6IC voltage regulator

Examination Scheme & Marks Distribution

Evaluation Structure

Final Board Theory Exam: 60 Marks (Pass mark: 24)
Internal Assessment: 40 Marks (Pass mark: 16)
Practical / Lab Exam: 25 or 50 Marks (Continuous lab evaluation + viva, where applicable)

* This is the general current IOE 60/40 scheme; verify course-specific details in the syllabus above.

Exam Preparation Guidelines

Review the available past examination paper to understand question styling, typical derivation topics, and marks allocation.
Practice drawing labeled circuit schematics, deriving transfer functions, and showing systematic mathematical steps.
Structure answers with labeled diagrams, concise bullet points, and highlight final answers in numerical solutions.

Authentic IOE Past Papers

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Curriculum Syllabus & Marking Scheme

Past Question Papers (PDF)

2nd-sem_Electronic Device and Circuits.pdf

Most Frequently Asked Questions

The Bipolar Junction Transistor (BJT)

Field-Effect Transistor

Operational Amplifier Circuits and Oscillator

Output Stages and Power Amplifiers

Power Supplies, Breakdown Diodes, and Voltage Reference

Year-wise & Session-wise Exam Papers

Curriculum Syllabus & Course Topics

1. The Bipolar Junction Transistor (BJT)

2. Field-Effect Transistor

3. Operational Amplifier Circuits and Oscillator

4. Output Stages and Power Amplifiers

5. Power Supplies, Breakdown Diodes, and Voltage Reference

Examination Scheme & Marks Distribution

Evaluation Structure

Exam Preparation Guidelines