Q1[6 Marks]Transient Analysis R-L-C Circuit by Classical Method
Derive the expression of current in series RC circuit excited by exponential voltage source by using classical method.
ENEE 154Bachelor in Computer Engineering · Semester 21 Paper Available
Electrical Circuits and Machines
Past examination question papers and complete curriculum syllabus for Electrical Circuits and Machines (ENEE 154), Bachelor in Computer Engineering Semester 2 under Institute of Engineering (IOE), Tribhuvan University.
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Institute of Engineering • 2083 Baishakh Board Examination
Q2[5 Marks]DC Machine
A shunt generator supplies 96 A at a terminal voltage of 200 V. The armature and shunt field resistance are 0.1 ohm and 50 ohm. The iron and frictional losses are 2500 W. Find a) emf generated, b) commercial efficiency.
Q3[5 Marks]AC Motor
A three-phase induction motor is wound for 4 poles and supplied from 50 Hz supply system. Calculate; (a) the speed of motor when the slip is 5% (b) the rotor emf frequency when the motor runs at 600 rpm.
Q4[8 Marks]Transformers
Briefly explain (Any Three) [3x3]
(a) Series and parallel magnetic circuit
(b) Universal motor
(c) DC motor starter
(d) Voltage regulation of transformer
Q5[5 Marks]Magnetic Circuit and Induction
List out features of ideal transformer. Show that main magnetic flux in the transformer core is independent of load current.
Curriculum Syllabus & Course Topics
Sourced from TU curriculum portalChapter-wise Units & Micro-Syllabus Topics (9 Units)
1. Transients in Electric Circuit
- 1.1Characteristics of various network elements
- 1.2Nodal analysis with dependent and independent sources
- 1.3Mesh analysis with dependent and independent sources
- 1.4Application of matrix method in network analysis
- 1.5Procedure of evaluating initial conditions
- 1.6Initial values of derivatives
- 1.7Initial condition in the case of R-L-C network
2. Transient Analysis R-L-C Circuit by Classical Method
- 2.1Introduction
- 2.2First order differential equation with constant coefficient
- 2.3Higher order homogenous and non-homogenous differential equation with constant coefficient
- 2.4Particular integral by method of undetermined coefficient
- 2.5Response of R-L and R-C circuits with DC excitation
- 2.5.1DC excitation
- 2.5.2Exponential excitation
- 2.5.3Sinusoidal excitation
- 2.6Response of Series R-L-C circuits with
- 2.6.1DC excitation
- 2.6.2Exponential excitation
- 2.6.3Sinusoidal excitation
- 2.7Response of Parallel R-L-C circuits with
- 2.7.1DC excitation
- 2.7.2Exponential excitation
3. Transient Analysis Using Laplace Transform
- 3.1Introduction
- 3.2Response of R-L and R-C circuits with
- 3.2.1DC excitation
- 3.2.2Exponential excitation
- 3.2.3Sinusoidal excitation
- 3.3Response of series R-L-C circuits with
- 3.3.1DC excitation
- 3.3.2Exponential excitation
- 3.3.3Sinusoidal excitation
- 3.4Response of parallel R-L-C circuits with
- 3.4.1DC excitation
- 3.4.2Exponential excitation
4. Network Transfer Function and Frequency Response
- 4.1Concept of complex frequency
- 4.2Transfer functions of two port networks
- 4.3Poles and zeros of networks
- 4.4Magnitude and phase response
- 4.5Bode diagrams
- 4.6Band width, high-q and low-q circuits
- 4.7Basic concept of filters: High-pass, low-pass, band-stop and band-pass filters
5. Two-Port Parameters of Network
- 5.1Definitions of two-port networks
- 5.2Parameters of two-port networks
- 5.2.1Open circuit impedance parameters
- 5.2.2Short circuit admittance parameters
- 5.2.3Transmission line parameters
- 5.2.4Inverse transmission line parameters
- 5.2.5Hybrid parameters
- 5.2.6Inverse hybrid parameters
- 5.3Relationship and transformation between sets of parameters
- 5.4Interconnection of two port networks
- 5.5Condition for reciprocity and symmetry
6. Magnetic Circuit and Induction
- 6.1Magnetic circuit and its types
- 6.2B-H relationship and hysteresis with DC excitation
- 6.3Hysteresis with AC excitation
- 6.4Hysteresis loss and Eddy current loss
- 6.5Faraday’s law of electromagnetic induction, statically and dynamically induced EMF
- 6.6Force on current carrying conductor
7. Transformers
- 7.1Construction, operating principle and EMF equation of single-phase transformer
- 7.2No load and load operation of transformer
- 7.3Equivalent circuit diagram of transformer
- 7.4Transformer testing (Open circuit and short circuit)
- 7.5Voltage regulation, losses, efficiency and condition for maximum efficiency
- 7.6Auto transformer, Isolation transformer
8. DC Machine
- 8.1Constructional details of DC machine
- 8.2Operating principle and EMF equation of DC generator
- 8.3Operating principle and torque equation of DC motor
- 8.4Types of DC machine
- 8.5Back EMF and its role in DC motor
- 8.6Performance characteristics of DC motor
- 8.7Starting of DC motor using 3-point starter
- 8.8Speed control of DC motor (Armature control, field control)
- 8.9Losses and efficiency
9. AC Motor
- 9.1Construction, production of rotating magnetic field and operating principle of three-phase induction motor
- 9.2Torque equation of three-phase induction motor at standstill and running condition
- 9.3Torque slip characteristics, condition for maximum torque and effect of rotor resistance on torque slip characteristics
- 9.4Single-phase induction motor
- 9.5Double field revolving theory
- 9.6Starting of single-phase induction motor (Capacitor start and run, shaded pole)
- 9.7Introduction to permanent magnet brushless DC motor, hysteresis motor, stepper motor, servo motor, universal motor
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.
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Curriculum Syllabus & Marking Scheme