ELEC1111 - Sample midterm test
1.
For the circuit shown in Figure, obtain Thevenin's equivalent circuit looking from the
terminals A-B. (Vth = 60 V, Rth = 66.67)
2.
For the circuit shown in Figure, determine the current that would flow in the 12
resistor
The University of New South Wales
School of Electrical Engineering and Telecommunications
ELEC1111
Electrical and Telecommunications Engineering
Practical Exam - Sample paper
Family name:
Student number:
Q1. Set the signal generator to give a sine wave wi
School of Electrical Engineering and
Telecommunications
Exam Guide
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
Question paper pattern
This semester the question paper will have 5
questions each assessed for 20 marks.
Ca
Family Name .
Given Name .
Student No. .
THE UNIVERSITY OF NEW SOUTH WALES
FINAL EXAMINATION,
SESSION II - 2008
ELEC1111
Electrical and Telecommunications Engineering
1.
Time allowed: 3 hours.
2.
PART A: 10 Multiple Choice Questions (Value = 30%).
3.
Ques
CheckYourUnderstanding
1. Acurrentissaidtoexistwhenever_
a.
b.
c.
d.
Awireischarged
Abatteryispresent
Electricchargesareunbalanced
Electricchargesmoveinaloop
2. Current has a direction. By convention,
current is in the direction that _
a. +chargesmove
b.
Lecture2
ElectricCircuits BasicConcepts
Dr.JayashriRavishankar
[email protected][email protected]
Introduction
Electricity the physical phenomenon arising from
the existence and interaction of electric charge.
Charge cannot be created or destro
School of Electrical Engineering and
Telecommunications
Lecture 4: BASIC CIRCUIT LAWS
Dr Ray Eaton
School of Electrical Engineering & telecommunications
CONTENTS
1. Circuit Elements
2. Circuit Variables
3. Ohms Law
4. Series and Parallel Resistors
5. Volt
School of Electrical Engineering and
Telecommunications
Lecture 5: Kirchhoffs Laws
Dr Ray Eaton
School of Electrical Engineering & telecommunications
CONTENTS
1. Introduction
2. Nodes, Branches, and Loops
3. Kirchhoffs Current Law
4. Kirchhoffs Voltage La
School of Electrical Engineering and
Telecommunications
Lecture 6: Nodal & Mesh Analysis
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
NETWORK ANALYSIS
Recall: Things we need to know in solving any resistive
circuit with cu
School of Electrical Engineering and
Telecommunications
Lecture 6: Nodal & Mesh Analysis
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
NODAL ANALYSIS EXAMPLE 3
3
What are the voltage at node 1 and 2?
2
NODAL ANALYSIS EXAMPL
School of Electrical Engineering and
Telecommunications
Lecture 7: Circuit Theorems
Dr Ray Eaton
School of Electrical Engineering & telecommunications
CONTENTS
1. Introduction
2. Superposition
3. Source Transformation
4. Thvenins Theorem
5. Nortons Theore
WRITING TASK 1: Band Descriptors (public version)
Band
Task achievement
Coherence and cohesion
9
fully satisfies all the requirements of the task
clearly presents a fully developed response
uses cohesion in such a way that it attracts no attention
ski
THE UNIVERSITY OF NEW SOUTH WALES
SAMPLE EXAMINATION
ELEC1111
Electrical and Telecommunications Engineering
SOLUTIONS
Question 1: (6 marks)
Consider the circuit shown in Figure 1.
(a)
Calculate the voltage V1. (V1 = 15 -2x2 = 11V)
(b)
Calculate the power
Name .
Student No. .
Student Signature .
THE UNIVERSITY OF NEW SOUTH WALES
SAMPLE EXAMINATION
ELEC1111
Electrical and Telecommunications Engineering
Time allowed: 3 hours.
1. CANDIDATES should attempt ALL QUESTIONS
2. Questions are of different values.
3.
ELEC1111 - Sample midterm test
1.
For the circuit shown in Figure, obtain Thevenin's equivalent circuit looking from the
terminals A-B. (Vth = 60 V, Rth = 66.67)
Solution
2.
For the circuit shown in Figure, determine the current that would flow in the 12
School of Electrical Engineering and
Telecommunications
Lecture 8: Capacitors & Inductors
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
Capacitors
Capacitor: Constructed using two parallel conducting plates
separated by an
School of Electrical Engineering and
Telecommunications
Lecture 8: Capacitors & Inductors
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
Capacitors
2
Capacitor:
Constructed
using
conducting plates separated by
material (e.g.
School of Electrical Engineering and
Telecommunications
Lecture 9: Response of RL &RC Circuits
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
First-order
circuits
Circuits with
only one
capacitor
Circuits with
only one
induc
10/3/2012
ELEC1111
Lecture9 Solution
DrJayashri Ravishankar
1
Example2
TakeR=10 andC=100F.
1
10/3/2012
t=0
v 0 v 0 10V
t=0+
i
i (0+) = -1 A
3
Transientequation
=0
= 10
= 10 x 100 x 10
v t Voc v 0 Voc e
=1
1
t
Rt C
= 0 + 10 0
=
= 100 x 10 x 10
=
Thisgives
School of Electrical Engineering and
Telecommunications
Lecture 10: AC circuit fundamentals
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
DC Vs AC
A voltage supplied by a DC
source has a certain polarity
& remains constant.
School of Electrical Engineering and
Telecommunications
Lecture 11: Operational Amplifiers Part 1
Dr Ray Eaton
School of Electrical Engineering & telecommunications
What is an Op Amp?
It is an electronic unit that behaves like a
voltage-controlled voltag
School of Electrical Engineering and
Telecommunications
Lecture 12: Operational Amplifiers Part 2
Dr Ray Eaton
School of Electrical Engineering & telecommunications
Actual circuit of Op-Amp
Ideal Op Amp characteristics
An ideal op amp has the following ch
School of Electrical Engineering and
Telecommunications
Lecture 13: Digital Circuits
Dr Ray Eaton
(Based on notes by Dr Jayashri Ravishankar)
School of Electrical Engineering & telecommunications
Analogue versus Digital
Two-level logic
Almost universal vo
School of Electrical Engineering and
Telecommunications
Week 11: Transformers Additional esamples
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
Example 4
Find I1 and I2 in the circuit below.
Turns ratio n = 2
0
0
0
Zin = 10
School of Electrical Engineering and
Telecommunications
Week 11: Transformers
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
A transformer is an AC equipment which helps to
transfer power from one circuit to another, without
School of Electrical Engineering and
Telecommunications
DC Machines
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
Types of electric machines
DC motor and generator
AC motor and generator
Induction Machine (Asynchronous M
School of Electrical Engineering and
Telecommunications
DC Machines - Examples
Dr Jayashri Ravishankar
School of Electrical Engineering & telecommunications
Example 1
A shunt generator has an induced emf of 254 V. When the
generator is loaded, the termina