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ENEE 201Bachelor in Electrical Engineering · Semester 31 Paper Available

Electric Circuit II

Past examination question papers and complete curriculum syllabus for Electric Circuit II (ENEE 201), Bachelor in Electrical Engineering Semester 3 under Institute of Engineering (IOE), Tribhuvan University.

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Note: This question paper file (2nd sem) was archived from an IOE exam session for the common Electric Circuit II curriculum.

2nd-sem_Electric Circuit II.pdf

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Most Frequently Asked Questions

Top recurring IOE board exam questions for Electric Circuit II with verified mark schemes, formula notation, and recurrence frequency.

Showing 30 of 30 top repeated questions

First-Order Circuits and Transient Response

6 Questions
#1Repeated 4 Times[8 Marks]First-Order Circuits and Transient Response
Derive the transient current response $i(t)$ of a series R-L circuit connected to a DC voltage $V$ at $t = 0$. Define time constant ($\tau = L/R$) and determine initial condition $i(0^+)$ and final steady-state condition $i(\infty)$.
Appeared in:2083 Baishakh2081 Bhadra2079 Chaitra2076 Chaitra
#2Repeated 4 Times[8 Marks]First-Order Circuits and Transient Response
Derive the charging and discharging voltage equations $v_c(t)$ for a series R-C circuit subjected to a step DC voltage. Show that energy stored in the capacitor at steady state is half of total energy drawn from source.
Appeared in:2082 Bhadra2080 Chaitra2077 Magh2075 Bhadra
#3Repeated 3 Times[8 Marks]First-Order Circuits and Transient Response
Derive the complete differential equation for a series R-L-C circuit. Classify the transient response into overdamped, critically damped, and underdamped cases based on roots of characteristic equation ($R \gtrless 2\sqrt{L/C}$).
Appeared in:2082 Chaitra2080 Baishakh2078 Bhadra
#4Repeated 3 Times[8 Marks]First-Order Circuits and Transient Response
A series R-L-C circuit with $R = 20\,\Omega$, $L = 0.1\text{ H}$, and $C = 100\,\mu\text{F}$ is energized by a $100\text{ V}$ DC supply at $t = 0$. Assuming zero initial conditions, find the expression for current $i(t)$ and voltage across capacitor.
Appeared in:2083 Baishakh2081 Chaitra2079 Baishakh
#5Repeated 3 Times[6 Marks]First-Order Circuits and Transient Response
Explain transient response of a parallel R-L-C circuit with DC current source excitation. Formulate the state differential equations for node voltage $v(t)$.
Appeared in:2082 Bhadra2081 Baishakh2078 Chaitra
#6Repeated 3 Times[6 Marks]First-Order Circuits and Transient Response
Explain initial condition evaluations: determine $i_L(0^+)$, $v_C(0^+)$, $\frac{di_L}{dt}(0^+)$, and $\frac{dv_C}{dt}(0^+)$ in switched circuits containing inductors and capacitors.
Appeared in:2082 Chaitra2080 Chaitra2076 Chaitra

Second-Order Circuits and Natural/Forced Response

5 Questions
#1Repeated 3 Times[6 Marks]Second-Order Circuits and Natural/Forced Response
Explain Fortescue's symmetrical components theorem. Define the symmetrical component operator $a = e^{j120^\circ} = -0.5 + j0.866$. Express phase quantities in terms of positive, negative, and zero sequence components.
Appeared in:2081 Chaitra2079 Chaitra2075 Bhadra
#2Repeated 3 Times[8 Marks]Second-Order Circuits and Natural/Forced Response
A 3-phase unbalanced system has line currents $I_a = 10\angle 0^\circ\text{ A}$, $I_b = 10\angle -90^\circ\text{ A}$, and $I_c = 10\angle 120^\circ\text{ A}$. Calculate the positive, negative, and zero sequence components of the currents.
Appeared in:2082 Bhadra2080 Baishakh2078 Chaitra
#3Repeated 3 Times[8 Marks]Second-Order Circuits and Natural/Forced Response
Derive the sequence impedance networks (positive, negative, and zero sequence) for: (a) balanced transmission lines, (b) synchronous generators with neutral grounding impedance $Z_n$.
Appeared in:2083 Baishakh2082 Chaitra2080 Chaitra
#4Repeated 3 Times[8 Marks]Second-Order Circuits and Natural/Forced Response
Explain zero sequence networks for three-phase transformers with different winding connections (star-star, star-delta, delta-delta, and grounded vs ungrounded neutral).
Appeared in:2081 Bhadra2079 Baishakh2077 Magh
#5Repeated 3 Times[6 Marks]Second-Order Circuits and Natural/Forced Response
Explain power invariance in symmetrical components transformation. Prove that total 3-phase complex power is given by $\mathbf{S}_{3\phi} = 3[V_{a0} I_{a0}^* + V_{a1} I_{a1}^* + V_{a2} I_{a2}^*]$.
Appeared in:2082 Chaitra2080 Baishakh2076 Bhadra

Laplace Transform in Circuit Analysis (s-Domain)

4 Questions
#1Repeated 3 Times[6 Marks]Laplace Transform in Circuit Analysis (s-Domain)
Define Laplace transform and state its key properties: Linearity, Time shifting, Frequency shifting, Differentiation in time, Integration in time, Initial Value Theorem, and Final Value Theorem.
Appeared in:2083 Baishakh2081 Bhadra2077 Chaitra
#2Repeated 3 Times[6 Marks]Laplace Transform in Circuit Analysis (s-Domain)
Derive the s-domain equivalent representations for inductor ($sL$ with initial current source $i(0^-)/s$ or series voltage source $L i(0^-)$) and capacitor ($1/(sC)$ with initial voltage source).
Appeared in:2081 Chaitra2079 Chaitra2075 Bhadra
#3Repeated 3 Times[8 Marks]Laplace Transform in Circuit Analysis (s-Domain)
Using Laplace transform, solve for the loop current $i(t)$ in a series R-L circuit excited by a sinusoidal voltage $v(t) = V_m \sin(\omega t + \theta)$ switched on at $t = 0$.
Appeared in:2082 Bhadra2080 Baishakh2078 Chaitra
#4Repeated 3 Times[8 Marks]Laplace Transform in Circuit Analysis (s-Domain)
Find the unit step response and unit impulse response of an underdamped second-order R-L-C circuit using partial fraction expansion and inverse Laplace transform.
Appeared in:2083 Baishakh2082 Chaitra2080 Chaitra

Fourier Series and Transform in AC Circuits

4 Questions
#1Repeated 3 Times[6 Marks]Fourier Series and Transform in AC Circuits
Explain trigonometric and exponential Fourier series representations for periodic non-sinusoidal waveforms. Define Dirichlet's conditions for convergence of Fourier series.
Appeared in:2082 Bhadra2080 Baishakh2077 Chaitra
#2Repeated 3 Times[8 Marks]Fourier Series and Transform in AC Circuits
Determine the trigonometric Fourier series for a square wave of amplitude $V_m$ and period $T$. Show that it contains only odd harmonics and calculate total harmonic distortion (THD).
Appeared in:2081 Chaitra2079 Chaitra2076 Chaitra
#3Repeated 3 Times[6 Marks]Fourier Series and Transform in AC Circuits
Explain waveform symmetries: Even symmetry, Odd symmetry, Half-wave symmetry, and Quarter-wave symmetry. How do these symmetries simplify the calculation of Fourier coefficients $a_0, a_n, b_n$?
Appeared in:2083 Baishakh2082 Chaitra2080 Chaitra
#4Repeated 3 Times[8 Marks]Fourier Series and Transform in AC Circuits
A non-sinusoidal voltage $v(t) = 100 + 50\sin(\omega t) + 20\sin(3\omega t + 30^\circ)\text{ V}$ is applied across a series circuit of $R = 10\,\Omega$ and $L = 0.05\text{ H}$ (with $\omega = 314\text{ rad/s}$). Find the RMS value of voltage, RMS current, and total active power dissipated.
Appeared in:2082 Bhadra2080 Chaitra2077 Magh

Two-Port Network Parameters (z, y, h, ABCD)

5 Questions
#1Repeated 3 Times[6 Marks]Two-Port Network Parameters (z, y, h, ABCD)
Define Two-Port Network parameters: Impedance ($Z$) parameters, Admittance ($Y$) parameters, Transmission ($ABCD$) parameters, and Hybrid ($h$) parameters. Write down their governing matrix equations.
Appeared in:2081 Bhadra2079 Baishakh2077 Magh
#2Repeated 3 Times[8 Marks]Two-Port Network Parameters (z, y, h, ABCD)
Derive the conditions for reciprocity and symmetry for: (a) $Z$-parameters ($Z_{12} = Z_{21}, Z_{11} = Z_{22}$), (b) $Y$-parameters ($Y_{12} = Y_{21}, Y_{11} = Y_{22}$), and (c) $ABCD$-parameters ($AD - BC = 1, A = D$).
Appeared in:2082 Bhadra2080 Baishakh2076 Bhadra
#3Repeated 3 Times[8 Marks]Two-Port Network Parameters (z, y, h, ABCD)
Find the $Z$-parameters and $Y$-parameters for a symmetrical T-network and $\pi$-network with given branch impedances $Z_1, Z_2, Z_3$.
Appeared in:2083 Baishakh2081 Chaitra2078 Bhadra
#4Repeated 3 Times[8 Marks]Two-Port Network Parameters (z, y, h, ABCD)
Explain the interconnection of two-port networks: series-series (Z-matrix addition), parallel-parallel (Y-matrix addition), and cascade connection (ABCD-matrix multiplication). State Brune's validity test.
Appeared in:2082 Chaitra2080 Chaitra2079 Chaitra
#5Repeated 3 Times[8 Marks]Two-Port Network Parameters (z, y, h, ABCD)
For a two-port network terminated with a load impedance $Z_L$, derive expressions for input impedance ($Z_{in}$), output impedance ($Z_{out}$), voltage gain ($A_v$), and current gain ($A_i$) in terms of $h$-parameters.
Appeared in:2083 Baishakh2081 Bhadra2078 Chaitra

Network Functions and Frequency Response

6 Questions
#1Repeated 3 Times[6 Marks]Network Functions and Frequency Response
Define driving point impedance, driving point admittance, and transfer functions in linear time-invariant networks. State the necessary conditions for positive real functions (PRF).
Appeared in:2081 Bhadra2079 Baishakh2076 Bhadra
#2Repeated 3 Times[6 Marks]Network Functions and Frequency Response
Explain poles and zeros of a network function. Discuss their physical significance regarding natural response stability. Plot the pole-zero constellation for $H(s) = \frac{s+3}{(s+1)(s^2 + 4s + 13)}$.
Appeared in:2082 Chaitra2080 Baishakh2078 Bhadra
#3Repeated 3 Times[8 Marks]Network Functions and Frequency Response
Construct the asymptotic magnitude Bode plot and phase plot for the transfer function $G(s) = \frac{100(s+2)}{s(s+10)(s+50)}$. Determine corner frequencies, gain margin (GM), and phase margin (PM).
Appeared in:2083 Baishakh2081 Chaitra2079 Baishakh
#4Repeated 3 Times[6 Marks]Network Functions and Frequency Response
Explain Hurwitz polynomials and Routh-Hurwitz stability criterion. Test whether the polynomial $P(s) = s^4 + 2s^3 + 3s^2 + 4s + 5$ has any roots in the right half of the s-plane.
Appeared in:2082 Bhadra2081 Baishakh2078 Chaitra
#5Repeated 3 Times[8 Marks]Network Functions and Frequency Response
Describe Foster I and Foster II form synthesis for LC driving-point immittance functions. Synthesize $Z(s) = \frac{s(s^2 + 4)}{(s^2 + 1)(s^2 + 9)}$.
Appeared in:2082 Chaitra2080 Chaitra2076 Chaitra
#6Repeated 3 Times[8 Marks]Network Functions and Frequency Response
Describe Cauer I and Cauer II ladder network synthesis for RC and RL immittance functions using continued fraction expansion.
Appeared in:2083 Baishakh2081 Bhadra2077 Chaitra

Curriculum Syllabus & Course Topics

Sourced from TU curriculum portal
Full Syllabus (PDF)
Chapter-wise Units & Micro-Syllabus Topics (7 Units)

  1. 1. First-Order Circuits and Transient Response

    6

  2. 2. Second-Order Circuits and Natural/Forced Response

    6

  3. 3. Laplace Transform in Circuit Analysis (s-Domain)

    8

  4. 4. Fourier Series and Transform in AC Circuits

    6

  5. 5. Two-Port Network Parameters (z, y, h, ABCD)

    8

  6. 6. Network Functions and Frequency Response

    6

  7. 7. Passive Filter Design and Synthesis

    5

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.

Frequently Asked Questions (Electric Circuit II)

Q: How can I download Electric Circuit II past question papers?

You can preview or download the Electric Circuit II question papers (PDF) directly using the built-in viewer on this page with zero redirects or paywalls.

Q: What is the pass mark for Electric Circuit II?

The general current scheme is a 60-mark final theory exam and a 40-mark internal assessment, with pass marks of 24 and 16. Verify the course-specific syllabus above.

Q: Where can I find the complete syllabus for this subject?

The available chapter-wise syllabus and topic breakdown is indexed in the Syllabus section above, with links to the curriculum PDF source.

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