COPYRIGHT©WWW.ET-HUI.COM ĐỀ CƯƠNG ƠN THI ANH VĂN CHUN NGHÀNH ĐIỆN TỬ ( ^_^ Created by whitestone04 from www.et-hui.com ^_^ ) Unit 1: ELECTRONICS IN THE HOME Electronics began the start of twentieth century with the invention of the vacuum tube A at@ B in C on D with It was not until 1958 that microelectronics began with the development of on silicon chips A CDs B hi-fi C ICs @ D vacuum tube Electronics timers in digital alarm clocks, water heaters, electric cookers and microwave ovens A is found B are found @ C is founded D have been founding In a simple radio, the function of the tuner is: A to select the required signal @ B to separate off the audio part of the signal C to amplify the signal D to drive the loudspeaker In a simple radio, the function of the detector is: A to select the required signal B to amplify the signal C to separate off the audio part of the signal @ D to drive the loudspeaker In a simple radio, the function of the AF amplifier is : A to select the required signal B to amplify the signal @ C to separate off the audio part of the signal D to drive the loudspeaker The radio a tuner, a detector, and an AF amplifier A consists of B is composed of C consist of D A & B is correct@ A tuner, a detector, and an AF amplifier _ the radio A comprise ( bao gồm)@ B combine C consist D compose In a simple radio, the tuner to the detector A is connected B is linked to C is connecting D A & B is correct@ 10 The volume control consists of a ten-microfarad electrolytic capacitor connected _ with a five-kilohm potentiometer (POT) A in series @ B in serial C parallel D directly 11 What is used to convert sounds into audio frequency signal? A loudspeaker B mixer C microphone@ D detector COPYRIGHT©WWW.ET-HUI.COM 12 What is used to amplify the power of the modulated carrier wave? A RF power amplifier@ B amplifier C aerial C modulator 13 the function of the aerial is: A to amplify the power of the modulated carrier wave B to transmit the modulated carrier wave over long distances C to receive the RF weak signal D B & C is correct @ 14 CD is the abbreviation of _ A Composed disc B compact driver C compact disc @ D compacted disc 15 hi-fi is the abbreviation of _ A high-finger B high-fidelity @ C hide-fidelity D hide-finger UNIT 2: COMPONENT VALUES 16 Resistors with colored band to ease the problem of marking such small components A code B coded C are coded @ D is coded 17 In a coded resistor, the forth band indicate _ A the tolerance@ B first digit C forth digit D number of zero following 18 If the forth band of a coded resistor is red, it means that A the tolerance is 2% @ B the tolerance is 5% C the tolerance is 10% D the tolerance is 20% 19 Relaxing the tolerance of the resistor enables the manufacture to sell them more _ A cheaper B cheaply @ C cheaplier D expensive 20 The preferred value may seem _ at first sight but this not so A illogic B logical C illogical @ D illogically 21 Why manufacturers make resistors in the preferred values rather than in equally stepped values? A Because they will sell resistors more cheaply @ B Because they will sell resistor more cheaper C Because they will sell resistors more expensively D Because they can not so 22 The fist band of a colored-banding coded capacitor indicate _ A fist digit @ B number of zeros following C tolerance D voltage 23 The forth band of a colored-banding coded capacitor indicate _ A fist digit B number of zeros following C tolerance @ D voltage COPYRIGHT©WWW.ET-HUI.COM 24 The fifth band of a colored-banding coded capacitor indicate _ A fist digit B number of zeros following C tolerance D voltage @ 25 Carbon resistors are _compressed graphite which is formed into small tubes A made of @ B made in C made from D made to UNIT 3: RADIO 26 Based on the way of travel, how many kinds of radio waves ? A One kind: surface or ground wave A Two kinds: surface wave and sky wave C Three kinds: surface or ground wave, sky wave and space wave @ D Four kinds: surface wave, ground wave, sky wave and space wave 27 Surface or ground wave travels along the ground, following the of the earth’s surface A curvature @ B culture C line D picture 28 Which material (vật liệu) has poor conductor? A water B sand @ C A&B is correct D A&B is incorrect 29 Poor conductors absorb surface or ground wave more than good conductor A weakly B easily C strongly @ D hardly 30 _ travels skywards and, if it is below a certain critical frequency (typically 300MHz), is returned to earth by the ionosphere A surface or ground wave B space wave C surface or ground wave and sky wave D sky wave @ 31 consists of layers of air molecules stretching from about 80km above the earth to 500km A atmosphere B troposphere C ionosphere @ D stratosphere 32 VHF, UHF, and microwave signals are the _ A space wave @ B sky wave C ground wave D surface wave 33 When _quickly, A cell may become hot A discharge B discharged C discharging@ D A cell dischange 34 The related noun(s) of the verb “Absorb” is/are A absorber B absorbtion C absorption D A&C are correct@ 35 The related noun of the verb “conduct” is/are A conducter B conducted C conductivity@ D conducty 36 AF is the abbreviation of _ A Audio Function B Audition Fan C Audio Frequency@ D Audible Food COPYRIGHT©WWW.ET-HUI.COM 37 RF is the abbreviation of _ A Radio Frequence B Radar Frequency C Radio Frequency@ D Road Frequency 38 AM is the abbreviation of _ A amplitude-modulated@ B amplituding - modulated C amplituding - modulated D amplitude - modulating 39 FM is the abbreviation of _ A frequency- modulating B frequency-modulated@ C frequent- modulated D frequent- modulating 40 A typical radio tuner circuit consists of an inductor and capacitor and capacitor connected in A paralel B paraleled C parallel@ D paralleling UNIT 4: MAKING A RECORD 41 Each vocalist, instrument, or group of instruments _ linked to a microphone on a mixer or mixing desk A is @ B are C were D have been 42 The mixing desk allows the _to adjust the recording level for each channel A computing engineer B telecommunicating engineer C studio engineer @ D All is correct 43 The instruments are through the mixer into a multitrack tape recorder A channel B to channel C be channelled D channelled@ 44 One of the most common effects is reverb (reverberation) which can made the music sound _it was recorded in a very large building or a very small room A as if@ B as C if D as far as 45 The sound is recorded on a two-track mastering machine to produce a master tape A editing B edited@ C edit D be edited 46 Each instrument using a microphone A records B recording C is recorded@ D are recorded 47 The remixed tape _to produce a master tape A is mastered down@ B are mastered down C is master down D masters down 48 the pits in the CDs represent the audio pattern A analogue B digital@ C electromagnetic D magnetic 49 the word “as” in the sentence “As the disc is revolved, a laser beam is used to mark audio information pattern on its surface” means A because B when@ C equal D for COPYRIGHT©WWW.ET-HUI.COM 50 After punching the centre hole,a _ is applied and the CD is packaged A label@ B a pit mark C a layer of plastic D a box UNIT 5: COMPUTER 51 The I/O (input/output) unit _ of one or more ICs A has B consist C consists@ D includes 52 is/are used to control the data going in and out of the computer A I/O units @ B ROM C RAM D address bus 53 The small ROM _ some permanent storage A gives B provides@ C give D provide 54 What is used for temporary storage? A RAM@ B ROM C CPU D register 55 The contents of the RAM are constantly A changing@ B change C changes D fixed 56 What provides some permanent storage? A RAM B ROM@ C CPU D register 57 Which part of the computer controls the rest of the system and performs all the arithmetic and logic operations on the data? A CPU@ B ROM C RAM D data bus 58 The only operates while the computer is switched on A RAM@ B ROM C CPU D gate 59 CPU is the abbreviation of A centre processor unit B control program unit C central program union D central processing unit@ 60 What are buses in the computer used for? A carrying the internal signal between each unit@ B transferring data between all the units C sending control signals from the CPU to the other unit D sending signals from the CPU which indicate the memory and I/O locations to be used 61 What is used to transfer data between all the units A data bus @ B control bus C address bus D processor bus 62 What is used to send control signals from the CPU to the other unit? A data bus B control bus@ C address bus D processor bus 63 What is used to send signals from the CPU which indicates the memory and I/O locations? COPYRIGHT©WWW.ET-HUI.COM A data bus B control bus C address bus@ D processor bus 64 What is used to change AC voltages from small to large or from large to small? A transformer@ B diode C resistor D capacity 65 What is used to measure very small current? A voltmeter B miliammeter@ C.milimeter D meter 66 What is used to check the logic level in the pins of ICs? A VOM B Oscilloscope C logic probe@ D Amp meter 67 What is used as a part of a burglar alarm to detect movement? A motion sensor@ B automatic cut-off C entry and exit relay D battery backup 68 What is used for the transmission of RF signal? A detector B radio set C aerial @ D receiver 69 What is used for protecting circuits from surge in voltage? A Diode B Fuse@ C Resistor D Switch 70 What is used to master down different recordings to make a master tape? A Microphone B CD C multi-track recorder D mixer @ 71 What is used to find buried metal? A Radio B Radar C detector@ D TV 72 What is the meaning of prefix semi-? A haft@ B full C all D not thing 73 What is the meaning of prefix de-? A opposite of B reverse of the action@ C far D across 74 What is the meaning of prefix dis-? A opposite of @ B reverse of the action C far D across 75 What is the meaning of prefix tele-? A opposite of B reverse of the action C far @ D across 76 What is the meaning of prefix tras-? A opposite of B reverse of the action C far D across @ 77 What is the meaning of prefix micro-? A small @ B many C big D large 78 What is the meaning of prefix multi-? A small B many @ C big D large COPYRIGHT©WWW.ET-HUI.COM 79 _ is the digital switching circuit A logic gate @ B VOM C delay D CB 80 _ is the logic gates whose output depends on the combination of its input A Flip-Flop B combinational logic@ C IC D CMOS 81 _ is the number of ICs used in a computer A chip count@ B count chip C scale of integration D BJT 82 _ is an indication of the number of components used in an IC A chip count B count chip C scale of integration @ D BJT 83 What is another name for a NOT gate? A inventor B converter C inter D inverter@ 84 What are two common families of logic ICs? A TTL and CMOS @ B BJT and CMOS C TTL and FET D BJT and FET 85 TTL is the abbreviation of _ A Transistor – Transfer logic B Transistor – transistor Location C Transistor – Transfer Location D Transistor – transistor Logic@ 86 CMOS is the abbreviation of _ A Complementary Metal Oxide Semiconductor @ B Common Metal Oxide Semiconductor C Complementary Means Oxide Semiconductor D Complementary Metal Oxide Semiresistor 87 VLSI is the abbreviation of _ A Very Large Signal of Integration B Very Large Scale of Integration @ C Very Long Scale of Integration D Very Long Signal of Integration 88 MSI is the abbreviation of _ A Middle Scale of Integration B Medium Scale of Integration @ C Medium Signal of Integration D Middle Signal of Integration 89 What is shown in a truth table? A The output for all possible inputs@ B the arrangement of the gates and the function of each pin on the chip C Basic gates D logic symbol 90 Which logic gate whose output is only high when all its inputs are high? A OR B AND@ C NAND D NOR 91 What is shown in an IC pin-out diagram? A The output for all possible inputs B the arrangement of the gates and the function of each pin on the chip@ COPYRIGHT©WWW.ET-HUI.COM C Basic gates D logic symbol 92 _ use bipolar transistors to form each gate A TTL ICs @ B CMOS ICs C BJT ICs D FET ICs 93 _ use field effect transistors to form each gate A TTL ICs B CMOS ICs @ C BJT ICs D FET ICs 94 _ are better for battery-powered portable computers A TTL ICs B CMOS ICs @ C BJT ICs D FET ICs 95 _ are suitable for use in large, high speed computers A TTL ICs @ B CMOS ICs C BJT ICs D FET ICs 96 What is used to convert electrical signal into visible signal? A detector B generator C LDR D Oscilloscope@ UNIT 6: REMOTE CONTROL 97 The remote control unit contains keys and electronic components similar to those of a _ A Computer B Calculator @ C mixer D detector 98 The keys by a matrix of wires which cross beneath each individual key A is connected B are to connected C are connected @ D be connected 99 Almost light is emitted from the LED A no visible @ B not visible C visible D no invisible 100 signals are used to prevent interference from any constant infra-red background ‘noise’ A Pulse B Pulsed @ C analogue D Pulsing 101 When the transmitter is switched on, _signals are sent from the transmitter to the receiver A micro wave B ultra-violet C infra-red @ D analogue 102 A code _by the length and spacing of these pulses switches on the LED A spelling out B spelted out C be spelt out D spelt out @ 103 The electrical pulses are converted by the _into pulsed infra-red radiation which is directed at the receiver A LED @ B LDR C transistor D resistor COPYRIGHT©WWW.ET-HUI.COM 104 The frequency of the oscillator is set by the _ timing components R1,R2, and C1 A internal B international C external @ D externally 105 The current output of the amplifier is controlled by the resistor R3 which is connect in _with the LED A series @ B sery C serial d serially UNIT 7: ALARM SYSTEM 106 A magnet mounted on the moving part of the window or door a switch mounted on the frame when the window or door is opened A trip B tripped C trips @ D would trip 107 Which devices respond to the shock of the glass being broken? A Radios B vibration sensors @ C pressure mats D magnetic witches 108 are fitted under the carpet-at the bottom of the stairs A magnetic switch B break detector C pressure mats @ D motion sensor 109 Why should pressure mats be regularly tested and replaced if necessary? A Because they’re constantly being walked on @ B Because they aren’t constantly being walked on C Because they are easy to be broken D another reason 110 Motion sensors may use passive infra-red, ultrasonic or microwave energy to detect _within their range A sound B light C heat D movement @ 111 When light falls on the LDR, its resistance _ A decreases @ B decrease C increases D increase 112 The transistor switches between cut-off and as the input resistance changes A cut-on B cut-out C saturation @ D interference 113 A diode is connected in reverse bias across the relay to prevent large back _ A EMF B FME C electromotive force D A and C are correct @ 114 _material is easily magnetized and demagnetized A magnetic B Ferric C Ferromagnetic @ D iron 115 The envelope contains , which helps to prevent corrosion of the contacts A nitrogen @ B hydrogen C oxygen B water 116 “You won’t set off the alarm when leaving or returning to the house” This is – the _ feature of alarm system COPYRIGHT©WWW.ET-HUI.COM A Entry and exit relay @ B automatic cut-off C tamper protection D battery backup 117 “This will stop the alarm after it has sounded for a set time, so that the noise doesn’t go on for hours if you’re not there to reset the system” This is the _ feature of alarm system A Entry and exit relay B automatic cut-off @ C tamper protection D battery backup 118 “The control panel incorporates sensors which will trigger the alarm if a burglar tries to force the box open” This is _ feature of alarm system A Entry and exit relay B automatic cut-off C tamper protection@ D battery backup @ 119 “If an intruder disconnects the main supply, the alarm will continue to work in a power cut” This is _ feature of alarm system A Entry and exit relay B automatic cut-off C tamper protection D battery backup @ 120 The opposite of cut-off is A cut-on B cut-in C situation @ D cut-in 121 The opposite of increase is A up B forward C decrease @ D unincrease 122 The opposite of fixed resistor is A light resistor B variable resistor @ C LED D coal resistor 123 The opposite of energize is A de-energize @ B un-energize C dis-energize D forward-energize 124 The opposite of slow is A fast @ B big C large D small 125 The opposite of forward bias is A backward bias B reserve bias @ C back bias D up bias UNIT 8: METAL DETECTOR 126 Despite their technical _, metal detector are based on a few very simple principles A complexity @ B complex C easy D combine 127 At fist, metal detectors were developed for military (quân sự) purposes to locate hidden _ A metal B rare find C worthless item D explosive @ (chất nổ) 128 Metal detectors operate on the principle of _ induction A electronic B electromagnetic @ C electrical D magnetic 10 COPYRIGHT©WWW.ET-HUI.COM 129 Metals are A semiconductors B not conductors C conductors @ D liquid 130 A coin buried horizontally is to detect than the same coin buried vertically A harder B easier @ C more harder D more easy 131 When an AC voltage is applied to the search coil, a field is produce A magnetic @ B electronic C electrical D electric 132 The voltage is converted into audible note by the circuitry in the control box A inducing B induced @ B be induced D be inducing 133 A microphone may be used to _ sound A detect @ B induce C generate D make 134 Electrical pulsed are fist at a frequency in the upper audio range by the audio oscillator A generated @ B induced C detected D generating 135 The oscillator pulses at a fixed frequency of 32 786 Hz A generate B generates @ C induce D induced 136 What is used to convert digital signal into analogue signal? A DAC converter @ B ADC converter C DCA converter D ACD converter 137 What is used to convert analogue signal into digital signal? A DAC converter B ADC converter @ C DCA converter D ACD converter 138 What is used to convert AC into DC? A rectifier @ B ADC converter C transformer D relay 139 What is used to convert electronic pulse into infra-red pulse? A LED @ B LDR C LCD D relay 140 special detectors are used in at airport to screen passengers for _weapon (vũ khí) A conceal B concealed (ẩn dấu) @ C concealing D be concealed UNIT 9: CAREERS IN ELECTRONICS 141 We are now the midst of the technological evolution which started with the introduction of the micro chip in the 1970s A at B in@ C on D into 142 More and _electronic goods are being sold, especially computers, radio telephones, and leisure products 11 COPYRIGHT©WWW.ET-HUI.COM A more@ B less C most D the more 143 Most domestic appliances now some form of electronic control A be B was C is D are@ 144 More engineer are _to design, plan, manufacture and install A require B requiring C required @ D be required 145 Service engineers are particularly _ demand A on @ B in C at D onto 146 Aircraft electronic equipment has to to a very high standard with rigorous checks at set intervals A be maintained @ B maintained B be maintain D maintaining 147 LAN is the abbreviation of A Local Area Network B Logical Area Network C Large Area Networking D Long Area Noun 148 Defense systems require not only engineers to design them, highly-skilled operators to man them and maintain them A but also B but C A and B is correct@ C A and B is incorrect 149 Automation has led to saving for the manufacturer but has also contributed to A unemployment@ B employment C employ D unemployed 150 People today expect to be able to get in touch each other at any time and in any place A to B with@ C from D for 151 Society a wide range of leisure electronic items A expects B expect C have expected D expecting 152 Recent years have seen a sharp _in equipment for patient care A increase B increased C is increase D All is incorrect  12 ... returning to the house” This is – the _ feature of alarm system COPYRIGHT©WWW.ET-HUI.COM A Entry and exit relay @ B automatic cut-off C tamper protection D battery backup 117 “This will stop the... Radio B Radar C detector@ D TV 72 What is the meaning of prefix semi-? A haft@ B full C all D not thing 73 What is the meaning of prefix de-? A opposite of B reverse of the action@ C far D across... reason 110 Motion sensors may use passive infra-red, ultrasonic or microwave energy to detect _within their range A sound B light C heat D movement @ 111 When light falls on the LDR, its resistance