ĐỀ CƯƠNG ÔN TẬP

I. Choose the correct answer A, B, C, or D to complete the sentences

1. Course 2 is similar ……Course 1 in that it deals with electronics.

A. to     .with    .for    . in

2. Resistors are coded with coloured …….to ease the problem of marking such small components.

    B. bands   

3. The numbers corresponding to the …..colours used and the values per position are shown above.

C. ten   

4. If the maker tried to ……and sell every value of resistance that exists, there would be chaos and the costs would be greatly increased.

    D. produce

5. The values may seem illogical at first sight, …..this is not so.

A. but   

6. A resistor is a component …..is used to add resistance to a circuit.

    B. which   

7. Zinc-carbon cell has a zinc ………… electrode, a manganese dioxide ………….. electrode.

A. negative/positive   

8. Recharging must be by a constant current power supply ………………… the very low internal resistance.. since    D. as

9. The remote control unit ………...keys and electronic components similar to those of a calculator.

    D. contains

10. The pressure of someone stepping on them causes two thin metal plates inside to come ………………., setting off the alarm.

    B. in contact   

11. What helps the alarm to continue to work in a power cut, or if an intruder disconnects the mains supply?

A. Battery backup   

12. A resistor is a component which is used to …..resistance to a circuit.

    C. add   

13. This consists of layers of air molecules stretching …………. about 80 km above the earth to 500 km.

    B. from   

14.……….are used for satellite communications.

A. Space waves   

15 It is known ……a NiCad cell.

    C. as   

16. The remote control unit contains keys and electronic components ……..to those of a calculator.

D. similar

17. ……a key completes an electrical circuit

A. Pressing   

18. A code spelt out by the ……and spacing of these pulses switches on the LED.

    D. length

19. A code spelt ……by the length and spacing of these pulses switches on the LED.

    B. out   

20. The LED …….on and off to send an infrared beam to the receiving “eye” on the television set.

    B. flashes   

21. Radio waves from a transmitting aerial can travel in one or more of ……. different ways.

    B. three   

22. Surface or ground wave travels ……… the ground.

    D. along

23. …………..travels along the ground, following the curvature of the earth’s surface.

    D. Surface wave

24. ……………… travels skywards.

    C. Sky wave   

25. If sky wave is below a certain critical frequency (typically 30 MHz), it is ……..to earth by the ionosphere.

    A. returned     

26. On striking the earth, the sky wave bounces back to the…….

B. ionosphere    C. space    D. sky

27. The critical frequency …….with the time of day and the seasons. 

    D. varies

28. …….can be used to measure a number of different electrical quantities.

    A. Multimeter     

29. ………. is used for measuring voltage levels and pulses in digital logic circuits.

B. Logic probe    C. Oscilloscope    D. Funtion generator

30. ………… shows how a signal varies with time or relative to another signal.

    C. Oscilloscope   

31. Cathode ray tube has ……. main sections.

    C. three   

32. The aim of HDTV is to provide the viewer with the more realistic images than are …….by today’s TV sets.

    D. offered

33. For fault-finding you must have at least a multimeter, either ……or digital.

    A. analogue       

34. Computers can be defined as devices which accept information in the form of instructions called a program and characters called…...

    A. data     

35. The document passes over a ..............which bounces light off the paper, reflecting the image onto a lens.

a fluorescent tube                  

36. The lens passes the light onto a....................which breaks the image down to a series of horizontal lines

c. microprocessor               

37. This establishes the different in potential ...............makes current flow possible.

d. which

38. Another microprocessor ...........each line to series of black and white dots.......are then coded usually as "0" for black and '1" for white.

d. converts- which.

39. A third microprocessor converts this information into .............. called analogue tone which can be sent down telephones lines.

a. signals

40. At the receiving machine the analogue tones are converted back into.................

b. binary signals             

41. With mobile phone system, all communication ………….through a central control base station

c, takes place                           

42…….a call is made from a cellphone, the cell phone scans the available frequencies.

a. When                    

43. To prevent the phone being turned on or off accidentally, you need to …..the PWR key to operate it.

c. hold on                       

44. Engineers ……..optical fibre cables in the 1980s.

d. developed

II. Rewrite the sentences using given words.

1. A resistor is a component. A resistor is used to add resistance to a circuit. (which)

A resistor is a component which is used to add resistance to a circuit

2. The ends of the graphite are sprayed with metal. This forms contacts. (to)

The ends of the graphite are sprayed with metal to forms contacts

3. End caps are forced on the metal-sprayed ends. The caps have connecting wires attached. (which)

End caps which have connecting wires attached are forced on the metal-sprayed ends

4. The ceramic is marked with colour bands.  The bands indicate the value and tolerance. (to)

The ceramic is marked with colour bands to indicate the value and tolerance

5. The glass is broken. The foil breaks too. (If)

If the glass is broken, the foil breaks too.

6. The alarm stops after a set time. You're not there to reset the system. (If)

The alarm stops after a set time if you're not there to reset the system

7. A magnetic field is set up in the speaker coil. The coil vibrates. (causing)

A magnetic field is set up in the speaker coil causing the coil  to vibrate.

8. The coil pushes and pulls the speaker cone. Sound waves are produced. (making)

The coil pushes and pulls the speaker cone making sound waves be produced.

III.Fill in each gap in the passage with one correct answer. A, B, C, D

1.

Resistors are (1) …..with coloured bands to ease the problem of (2) …….such small components.

The (3) ……corresponding to the ten colours used and the values per position are (4) ….. above.

For example, 180,000 ohms is coded with the first digit brown, then grey and finally yellow. The fourth band indicates the tolerance (5) ….. the value has with respect to the stated value. For (6)…….., silver indicates 10% tolerance, meaning that the 180,000 ohms could (7) ……between 180,000 ± 18,000, i.e. 162,000 to 198,000.

These (8) …..may seem to reflect poor manufacture (9) ……in most circuits they are, in fact, quite satisfactory. Relaxing the tolerance enables the maker to (10) ……them more cheaply.

    B. coded

2. A. marking       

    B. numbers       

4. A. shown

D. that

6    B. example

7. A. vary

    B. tolerances

C. but   

D. sell

2.

Nowadays, we can change (1)……, adjust the sound and picture, and call up the range of services on the teletext systems (2) …..the push of a button.

The remote control unit contains keys and (3) ……components similar to (4) …..of a calculator. The (5) …..are connected by a matrix of wires (6) …..cross beneath each individual key. Pressing a key completes an (7) ….circuit, and a signal is sent to a microchip which, in turn, sends a series of electrical pulses to a light (8) …..diode (LED) at the front of the handset. A code (9) ….out by the length and spacing of these pulses switches on the LED. The LED flashes on and off to send (10)…. infrared beam to the receiving “ eye” on the television set.

1D. channel       

2.     B. with           

3.     C. electronic    D. electricity               

4.     D. those               

5. A. keys               

6.     B. which           

7.         C. electrical           

8    B. emitting               

9C. spelt                   

10    B. an               

3.

        Computers are part ………1………….. our everyday lives. They have an ………2……… on almost everything you do. When you buy groceries at a supermarket, a computer ………3………….. with laser and barcode technology to scan the price of each item and present a total. Barcode items (clothes, food, and books) ……………4………… a computer to generate the barcode, labels and maintain the inventory. Most television …………5…………… and many films use graphics produced by a computer. In ………6…... besides terminals connected to the hospital’s main computer …………7……….. doctor to type in order for blood tests and to schedule ………8………….. Banks use computers to look after their customers’ ………9………... In libraries and bookshops, computers can help you to find the book you want as ………10……….  as possible.

1    B. of           

2. A. effect       

3.    B. uses           

4. A. require   

5    C. advertisements   

6. A. hospital   

      7.    B. allow       

8.    B. operations       

9.    D. money

10.    D. quickly

IV. Read the passages and choose the correct answer for each questions

1.

The first stage is a sensing device that changes its resistance when it detects a particular form of energy. For example, a microphone may be used to detect sound, a thermistor to detect heat, or an LDR (light-dependent resistor) to detect light.

The second stage is an electronic switch. In its simplest form, this could be a single transistor. The transistor switches between cut-off and saturation as the input resistance changes.

The third stage is an output transducer which is switched off and on by the electronic switch. The output transducer could be a buzzer, a light, or a relay which operates a more powerful circuit.

1. What is changed in the first stage?

C. the resistance   

2. What is used to detect light?

D. a light-dependent resistor

3. What could an electronic switch be in the simplest form?

B. a single transistor

4. What makes an output transducer is switched off and on?

A. the electronic switch   

5. What is the last stage?

C. an output transducer   

2.

        A flash of lighting that leaps through the sky during a thunder storm is one of the most visible signs of electricity. At almost all other time, electricity is invisible but hard at work for us. Electricity is a form of energy. It consists of electrons- tiny particles: (tiểu phân tử) that come from atoms( nguyên tử). Each electron carries a tiny electric charge which is an amount of electricity. When you switch on a light, about one million electrons move through the bulb every second. Cables hidden in walls and ceilings carry electricity around houses and factories, providing energy at the flick of a switch. Electricity also provides portable power. Batteries produce electricity from chemicals and solar cells provides electricity from energy in sunlight. Lamps, motors, and dozens of other machines use electricity as their source of power. Electricity also provides signals which make telephones, radios, televisions and computers work.

1. What is the most visible sign of electricity

A. A flash of lighting that leaps through the sky during a thunder storm

for us

2. What does electricity consist of?

B. atoms

3. What does each electron carry?

D. electric charges

4. Where does solar cells produce electricity?

A. from energy in sunlight   

5. What make telephones, radios, televisions and computers work?

    B. electricity

3.

Television (HDTV) is to provide the viewer with more realistic images than are offered by today's television sets.

Existing European television pictures are made up of 625 lines, with a total of about 120 000 dots.

In comparison an HD picture consists of 1 250 lines and is composed of four times as many dots. This gives greatly increased detail and enhanced color reproduction.

Viewing and listening conditions

The optimal viewing distance for HDTV is three times the height of the screen compared with seven times the present televisions. This means your viewing range will be expanded from 10° to 30°. As a result you will have a much greater sense of reality, and may feel that you are there as the action unfolds. HDTV offers you three-dimensional sound, as it uses more speakers than today's sets.

For HDTV the width/height ratio of the screen has been changed from 4:3 (as in conventional TV) to 16:9, like the screens in cinemas. From corner to corner it measures 100-125 cm.

1. What is the purpose of HDTV?

A.    supply the viewer with more realistic images.

2. How many lines are existing European TV pictures made up of?

A.    625

3. How many dots are there in a HD TV picture?

A.    480 000

4. What are goods points about a HD TV compared to normal TV?

A.    all a.b.c

5. What is the main idea of this paragraph?

A.    HD TVs are much better than normal TVs.

V.Translation these sentences into English and Vietnamese

1. Trong thực tế, các nhà sản xuất chỉ làm các điện trở có các giá trị yêu tiên.

Atually, manufacturers made resistors which has popular values only.

2. Mỗi điện trở được đánh dấu với các màu sắc để chỉ giá trị của nó.

Each resistor is color marked to indicate the value.

3. Điện trở là một linh kiện cái mà được sử đụng để tăng điện trở của một dòng điện.

Resistor is componets which use to add the resistance to a circuit.

4. Pin kẽm cácbon là loại pin phổ biến nhất cho việc sử dụng dòng điện nhỏ.

Zinc-Carbon is the most popular bateries which use for small current

5. Điều khiển từ xa gồm các nút và các linh kiện điện tử tương tự như của  một máy tính

The romote control contains buttons and electronic components like a calculator

6. Diode phát quang ở mặt trước của máy thu phát cầm tay.

LED is in front of the handset

7.  These tolerances may seem to reflect poor manufacture but in most circuits they are, in fact, quite satisfactory.

Nhũng dung sai này có thể được sản xuất không nhiều nhưng vẫn đáp ứng hầu hết các mạch điện, trong thực tế đã phần nào thỏa mãn.

8. Ti vi có độ nét cao cung cấp cho người xem với hình ảnh chân thật hơn các ti vi hiện nay.

HDTV is to provide the viewer with more realistic images than offered by today’s TV sets.

9. Hầu hết máy tính có 3 khả năng.

Almost computer has 3 main capabilities.

10. Máy tính có các mạch mà có thể đưa ra các quyết định.

Computers has circuits which can make decisions

11. Chương trình và dữ liệu được giữ ở bên trong máy tính ở một nơi gọi là bộ nhớ.

Programs and data are kept in side of  the computer where called memory.

12. Space waves are also used for satellite communications.

Sóng khôg gain cũng được sử dụng cho liên lạc qua vệ tinh.

13. Surface or ground wave travels along the ground, following the curvature of the earth’s surface.

Sóng bề mặt hay sóng mặt đất lan truyền trên bề mặt đất, theo sự uốn cong của bề mặt trái đất.

14. This instrument is used for measuring voltage levels and pulses in digital logic circuits.

Thiết bị này được sử dụng để đo mức điện áp và xung trong mạch logic

15. Máy fax được kết nối như thế nào?

How does the connect of Fax machine?

16. Không được sử dụng giấy trên máy fax cho  mục đích khác.

Do not use paper of Fax machine for other purpose

17. Thấu kính truyền ánh sáng qua một bộ vi xử lý, bộ vi xử lý này sẽ xử lý chia nhỏ hình ảnh thành cách một loạt các thanh ngang.

The lens passes the light on to the microprocessor which breaks the image down to a series of horizontal lines.

18. Vấn đề thiếu tần số phù hợp có thể được khắc phục bằng việc sử dụng hệ thống điện thoại di động.

Lack of satisfy frequency problem can be solved by used cell phone system

19.Tài liệu được đưa vào trong máy fax úp mặt xuống.

A document is fed into fax machine, face down

20. Tại đầu máy nhận, tín hiệu tương tự được chuyển đổi thành mã nhị phân và đưa qua đầu nhiệt.

At the receiver, analogue signals are converted to binary code and fed into a thermal head.

21. Cho phép tôi được tự giới thiệu tôi tên là Lan, 20 tuổi tốt nghiệp trường ĐHSĐ năm 2014.

May I introduce about me! My name is Lan, 20 years old and will be graduated from SDU in 2014

22. Với những kinh nghiệm và trình độ của mình, tôi tin sẽ đáp ứng được yêu cầu công việc.

With my experiences and my knowledge, I will satisfe the job requirements.

23. Dots are converted into digital information.

Các điểm được biến đổi sang thông tin số

24. Microprocessor converts each line into series of binary - coded dots.

Bộ vi xử lý biến đổi từng dòng sang chuỗi các điểm mã nhị phân

25. I’d regret to inform you that your application has not been successful.

Tôi rất lấy làm tiếc khi thông tin với bạn rằng bạn đã không thành công trong ứng viên lần này

27. If you hold down CLR, the whole number will be deleted and the p3 will go back to standby.

Nếu bạn giữ xuống CLR thì số này sẽ bị xóa và p3 sẽ đi vào chế độ tiến chờ.