The Open University of Sri Lanka
Department of Electrical and Computer Engineering
Diploma in Technology
ECX3232 Electrical Power
CAT 2- Open Book Test 2011/2012
Duration : One hour and fifteen minutes.
Date: 07th November 2011
Time: 1545-1700 hrs
21/07/14 TO 01/08/14
W. N. AMARANATH.
Analog TV network
Digital TV network
DIGITAL TV SIGNAL
VIDEO AND AUDIO DATA SIGNAL
of video and
The word television has its origin in two
Greek words tele and vision.
Tele means at distance and vision means
TV CAMERA TUBE
A TV camera, the heart of which is a camera tube,
is used to convert the optical n
Sync separation and processing
Scanning Currents in the yoke
DC power supplies
Y Signal channel
Television Signal Transmission & Propagation
Picture Signal transmission
Positive and negative modulation
Vestigial sideband transmission
Standard channel BW
TV Signal propagation
Interference suffered by TV chann
Introduction to Video Signals
Geometric form and aspect ratio
No. of scanning lines
1) Serial In - Serial Out Shift Right Shift Registers
2) Serial In - Parallel Out Shift Right Shift Registers
3) Parallel In - Serial Out Shift Right Shift Registers
4) Parallel In - Parallel Out Shift Right Shift Registers
(GLOBAL SYSTEM FOR
What is GSM ?
System Architecture Mobile Station (MS)
Basic Features Provided by GSM
Advanced Features Pr
Reg No :
What is HSDPA?
HSDPA stands for High Speed Downlink Packet Access.
HSDPA is associated with the various Universal Mobile
What is LTE?
LTE Systems overview
Evolution of Radio Access Technologies
LTE (3.9G) :
3GPP release 8~9
3GPP release 10+
Telecommunications Systems background notes for the academic year 2014-2015
BASIC TRAFFIC THEORY
To understand and explain why telecom systems have to deal with randomness
To know the basic definitions: calling rate, busy hour, Erlang
Name : H.D.S.Jayashani
Reg no : 412265348
Major LTE technologies
Block diagram of LTE architecture
LTE architecture key concepts
Features of LTE
Advantages of LTE
INTRODUCTION OF LTE
standards for Lon
Introduction to Advanced
audio recording for Radio &
Voice and Speech
Sound generated by the vocal cord is then
communicated to the air.
The speech contain frequencies which lie
within the frequency band 100 10000Hz
Speech Transmission for ente
Type of Transformers
Transformers are electrical devices that are designed to transfer energy from one circuit to another by
electromagnetic induction. They are used typically to increase or decrease voltage as it passes from one side of the
Model Answer CAT-2 ECX3232
Academic year 2012/2013
40 x 103 Watts 8= P, 60Hz
Friction and windage loss= 3500 Watts
2 * Stator loss = Rotor loss
3/4th of Full load delivers at a speed of 960 r.p.m.
The synchronous speed Ns is given by the equation
Model Answer Cat-1; ECX-3232, Electrical power
Total active power P 50 10 25 85kW
Total reactive power Q 37.5 0 18.75 18.75k var
Total power of the composite load = 85 j18.75kVA
p.f. of the composite load = Cos tan
Advanced Technician Diploma
in Electronics Engineering
with Li-ion Backup.
The way to success
Drew the required circuit diagram using
an IC, including solar cell and li-ion cell
Academic year 2005/2006
Model Answer for ECX-3232 Assignment-1 (Electrical Power)
Load A = 900 kVA p.f. 0.6 lagging.
Load B = 400 kVA p.f. 0.8 leading.
Load A = 540-j720
Load B = 320+j240
Total kW = 860
Total kvar = - 480 or 480 kvar lagging.
Electrical Low Distribution Earthing
CRN EL 003
LOW VOLTAGE DISTRIBUTION
EARTHING & DISTRIBUTION
Issued January 2012
Owner: Principal Signal Engineer
Approved by: David Sweeney
Authorised by: Glenn Dewb
3rd Class / AC Machines
Dr. Inaam Ibrahim
10. Starting Method for Induction Motors
A 3-phase induction motor is theoretically self starting.
The stator of an induction motor consists of 3-phase windings,
which when connected to a 3-phase supply creates a
How Do Microphones Work?
How Do Microphones Work?
Microphones just convert a real sound
wave into an electrical audio signal. In
order to do so, they have a small, light
material in them called the diaphragm.
When the sound vibratio
Introduction to Advance
Audio Recording for TV &
A Recording-Studio such as TV &
Radio Studios has a facility for
A control room which houses the
equipment for recording
Some type of studio recordings are
What we are going to learn ?
Block Diagram & operation of color TV
receiver (PAL D type)
Explain block diagram of
Comparisons between NTSC, PAL
March 9th, 2005
Types of Data Transmission
Types of Serial Data Communication
Asynchronous Data Transmission
Data Transmission Rates
Examples of Data Transmissio
Serial and Parallel
Explain serial communication
Standards, ports, resources etc.
Show a few examples of serial
communication connections used in
Describe the features of parallel
What is the NGN (Next Generation Network) ?
NGN is packet base network able to provide service
including telecommunication servic