- •29 Word study Verbs and related nouns
- •34 Language study Describing a process
- •3 6 Writing Describing a process
- •Tuning-in
- •66 Writing 2 Ordering components
- •74 Tuning-in
- •81 Listening
- •82 Language study Would
- •In the future, electronics are likely to become even more common in the home as multimedia entertainment systems and computer-controlled robots are developed.
- •Rf carrier
- •Introduction to Electronic Systems
- •16 Weeks X 2 VI hours
- •When is the lunch break?
- •10 These tolerances may seem to reflect poor manufacture but in most circuits they are, in fact, quite satisfactory. Relaxing the tolerance enables the makerto sell them more cheaply.
- •X varactor diode
- •Identify each of the following diodes:
- •10 The first stage consists of a transformer which steps down the voltage of the ac mains (see Fig. 2).
- •Smoothed dc input
- •15 Common is reverb (reverberation) which can make the music sound as if it was recorded in a very large building or a very small room.
- •Making a recording Places People Equipment
- •4 How is mixing down like developing and printing a photograph?
- •In this text which are additional to those given on the tape.
- •3 You must always keep an eye on the recording level.
- •1 A photodiode picks up rays from the remote control.
- •Ir diode
- •2 How many detection devices does it show? Name them.
- •4 If a burglar walks in front of a motion sensor,
- •7 A magnet on the moving part trips a switch if
- •Sensing device Used to detect
- •9V battery
- •In a frequency-modulated (fm) wave, the audio signal is combined with the rf carrier wave to vary the frequency of the carrier (see Fig. 2).
- •Af power amplifier
- •Via di Pietra Papa 00146 Roma
- •25 Die away naturally. As it dies, the current in the object reactivates the search coil. This voltage is then amplified to indicate with a sound or a flashing light that an object has been found.
- •4 The magnetic field a voltage in the search coil.
- •5 Noise is also by the low-frequency mains supply.
- •In left
- •In right о г
- •Interviewer: a test engineer. What would that involve?
- •I Is there any other kind of work you! enjoy?
- •15 Instead of recording the sound waves continuously, a drum з
- •4 These are converted to electrical signals by (use) a microphone.
- •15 Vinyl records are eliminated such as 'crackle' caused by dust and static, and 'jumping', due to scratches on the recording surface.
- •8 What might be the effect of so many people having cd players?
- •1 Unlike lPs, cDs use a digital recording system.
- •7 The electron gun in a crt a stream of electrons.
- •20 With an oscilloscope so that a visual display of the waveform can be seen.
- •45 Electrons.
- •Video cassette recorder
- •Italics from the text below. One has been done for you.
- •Vhs video-recorder mechanism
- •15 The number of iCs used in a computer, I.E. The chip count, can be reduced by connecting nand gates together to form other types of gates (see Fig. 3).
- •Integration as shown in Table 1. The 1с shown in Fig. 2 is an ssi 20 device but microprocessors used in computers are vlsi or slsi devices.
- •Input impedance low high
- •Instead of using the complicated springs, cogs, and wheels of a mechanical watch, the digital watch uses a vibrating crystal to keep time. It is accurate to one second in 10 years.
- •Vibrating crystal
- •15 Each one-second pulse triggers the microchip to send signals to the digital display to advance the numerals by one second.
- •Xdiaphragm
- •65 System.
- •1 Engineers developed optical fibre cables in the 1980s.
- •2 What is the purpose of the dielectric material in coaxial cable?
- •Insulator (e.G. Polyethylene) sheath
- •Insulator (e.G. Polyethylene) covering wire
- •25 Microwaves can be guided along rectangular copper ducts by a series of reflections from the inner walls (see Fig. 4).
- •If you make a mistake when keying in a number and you want to delete the last digit:
- •If you hold down clr,the whole numberwill be deleted and the p3 will go back to standby.
- •3 What is the difference between a mobile phone and a cellphone?
- •20 Telephone calls at the same time. To achieve this, each
- •30 Compromise between the number of frequency channels available in each cell and the interference between communications in different cells.
- •40 Calls from other cellphones and fixed telephones throughout the whole telephone system (see Fig. 2).
- •50 Call, the 8kHz signal is discontinued and the speech channel is enabled.
- •8 The signal indicates a suitable frequency channel for the call.
- •5 Converts the binary data into digital information (lines 21-22)
- •International international
- •40 As ordering goods and controlling bank accounts.
- •1 Avionics
- •2 Computing
- •3 Defence
- •1991-Present
- •1990-1991 Summer 1989
- •1 A technician with experience in servicing hospital equipment.
- •4900 University Avenue
- •If you would like to hear about outstanding opportunities in Europe to work in the expanding area of personal communication systems, write to:
- •If you can fill one of these vacancies, contact us at once.
- •I'm interested. I have the following training/ experience:
- •If a target is hit. .
- •Input signal
- •1 Manufacturing
- •2 Planning
- •3 Installation
- •4 Commissioning
- •If a target is hit. .
- •5 Maintenance
- •6 Sales
- •8 Research and Development
- •30 Large companies run their own r&d departments. Exciting
- •Induced in an inductor in opposition to the
- •Video image of the internal organs of a
- •2 [13] One side (left or right) of a stereo
- •In one unit and sharing a common
- •Voltage produced by an electrical source
- •241 Solid cylinder of metal oxide insulating
- •Video picture flip-flop /'flip йар/ [24] digital electronic
- •Instrument used for detecting pulses and
- •1 Or 0, high or low) long wave /'log weiv/ [10] range of radio
- •Voltage ac electricity supply maintain /mem'tem/ [22, 29] keep in good
- •Integrated circuit on one piece of silicon microcomputer/,maikraukam'pju:ta(r)/
- •Instrument for measuring various electrical quantities including voltage, current and resistance
- •Inputs are high natural frequency /.Naetjaral 'fri:kwansi/
- •Voltage ionizes the neon gas inside network /'netw3:k/ [26] system of
- •Interconnected devices network manager /,netw3:k 'тгепк1зэ(г)/
- •Interconnected telephone lines for use by
- •In a public telephone network which
- •Voltage which causes a component to pass
- •Various signals used in the test and
- •Integration: between 104 and 10s active
- •Voltage level from varying stable /'steibl/ [24] in a balanced state stage /steid3/ [5] circuit block: section of
- •In a circuit suppress /sa'pres/ [18] prevent a signal
- •Iks,tjemd3/ [28] switching centre for
- •Video signal teletype terminal /'telitaip ,t3:minal/ [28]
- •Images over long distances television receiver Ле1шзп n,si:v9(r)/
- •Isolating an ac supply voltage transistor /traen'zistsir)/ [1]
- •28] Cable or duct for guiding signals
- •Variable capacitor or resistor for making
- •V/VI:/[4, 11] volt
- •Vacuum tube /'vaekjuim tju:b/ [1 ]
- •Vdu /VI: di: 'ju:/ [28] visual (or video)
- •Video screen vdu terminal /VI: di: 'ju: ,t3:min3l/ [28]
- •Video recorders
- •Video-conferencing
- •Voltmeter I
1 Avionics
Aircraft electronic equipment has to be maintained to a very high standard with rigorous checks at set intervals. Service engineers are required to maintain on-board equipment such as radio, radar, and automatic flight path plotting equipment. Air traffic control equipment 5 is maintained on the ground.
2 Computing
This is an area where competition between companies is considerable and technology is moving very quickly. With the increasing numbers of computers used in the office, the home, and as part of industrial and communications equipment, there is a growing need for engineers to 10 design these as well as service them. On the software side, there is always a demand for programmers to design software for business use and for leisure.
Almost every large business organization, like banks and insurance companies, runs several local area networks (LANs). These require 15 network managers and maintenance and software support.
3 Defence
The reduction in political tension in recent years has meant cuts in the defence industry. Nevertheless, many countries are still developing
sophisticated defence systems both for home use and for export. These systems require not only engineers to design them, but highly-20 skilled operators to man them and maintain them. Thus the armed services recruit and train numbers of electronics technicians and engineers.The major fields of defence electronics are:
early warning systems, e.g. radar
detection systems
25 3 ranging, using radar and computers
weapons guidance, using computers
communications
4 Industrial electronics
Industrial electronics started with transducers which allowed remote monitoring of processes, especially those which involved high 30 temperatures or dangerous substances. Further developments allowed processes in a whole range of industries - from food and drink production to garbage recycling - to be fully automated.
The development of robotics has led to widespread application in the car industry in particular. Everything from assembling to spraying the 35 completed car can now be done without human assistance. Tedious and unpleasant jobs have disappeared. Automation has led to savings forthe manufacturer but has also contributed to unemployment. Electronics engineers are required to design and service industrial circuits, including control panels.
5 Leisure products
40 Society expects a wide range of leisure electronic items. This can be gauged by sales of radio, hi-fi equipment, television sets, compact disc players, video recorders, satellite receivers, etc. Engineers and technicians are required not only to design and manufacture these, but also to maintain them.
6 Telecommunications and broadcasting
45 People today expect to be able to get in touch with each other at any time and in any place. The communication of speech, text, and other data by cable and radio is a growing field of employment. Cellphones are an area of recent expansion.
Engineers are employed to manufacture, plan, install, commission, 50 and maintain telecommunication equipment. National and local radio and television stations employ broadcasting and sound engineers.
7 Medical equipment
Recent years have seen a sharp increase in equipment for patient care This ranges from body scanners to electronic stethoscopes. While the operation of this equipment is the responsibility of the medical team, 55 engineers are required to work with medical experts in the design of such equipment, in the installation of larger equipment, and in maintenance. Job satisfaction in this area can be high.
Speaking practice
Work in pairs, A and B. Note any advantages and disadvantages for each type of employment using information from your partner and from your texts. You may add any opinions of your own.
Student A: Your texts are on page 180. Student B: Your texts are on page 187.
Type of employment Advantages Disadvantages
Manufacturing
Planning
Installation
Commissioning
Maintenance
Sales
Teaching
Research & Development
Word study Topic sets, 2
Group these technical terms into the topic sets below.
base station cell
counter
data
divider flicker
flyback
LCD
logic gate MSC
microprocessor
program
quartz
raster
scan
Topic sets:
digital watch cellphones computers television display
Writing Describing career plans
Write a brief description of your career plans, using information of your own and from this unit.
Job ads
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Reading Understanding job ads
Study the job advertisement above. Answer these questions:
What is the name of the company?
What are its activities?
Where is the company based?
How many posts are vacant?
Which posts are available to those without experience?
How do you apply for a post?
Who is Mr Clark?
What salaries are offered?
Charles Dunkin decides to apply for one of the Trainee Service Engineer posts. Look at his CV below and his letter of application on the following page.
Imagine you are Mr Clark of Communicate (UK) Limited. List Charles' strong points and his weak points.
Applicant Charles Dunkin
Strong points
Weak points
CURRICULUM VITAE
Personal details
Name: Charles Dunkin Date of birth: 30 May 1974
Address: 44 Maxton Street, Bath, BL14 6FH Marital status: Single
Education