Đề cương ôn thi anh văn chuyên nghành điện tử

ĐỀ CƯƠNG ÔN THI ANH VĂN CHUYÊN 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 tubeA. at@ B. inC. on D. with It was not until 1958 that microelectronics began with the development of ____ on silicon chipsA. CDs B. hi-fiC. ICs @ D. vacuum tube Electronics timers ____in digital alarm clocks, water heaters, electric cookers and microwave ovensA. 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 signalC. to amplify the signalD. to drive the loudspeaker. In a simple radio, the function of the detector is:A. to select the required signalB. to amplify the signalC. 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 signalB. 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 ofC. consist of D. A & B is correct@ A tuner, a detector, and an AF amplifier___ the radio.A. comprise ( bao gồm)@ B. combineC. consist D. compose In a simple radio, the tuner ____ to the detectorA. is connected B. is linked toC. is connecting D. A & B is correct@ The volume control consists of a ten-microfarad electrolytic capacitor connected _____ with a five-kilohm potentiometer (POT)A. in series @ B. in serialC. parallel D. directly What is used to convert sounds into audio frequency signal?A. loudspeaker B. mixerC. microphone@ D. detector What is used to amplify the power of the modulated carrier wave?A. RF power amplifier@ B. amplifierC. aerial C. modulator the function of the aerial is:A. to amplify the power of the modulated carrier waveB. to transmit the modulated carrier wave over long distancesC. to receive the RF weak signalD. B & C is correct @ CD is the abbreviation of___A. Composed disc B. compact driverC. compact disc @ D. compacted disc hi-fi is the abbreviation of_____A. high-finger B. high-fidelity @C. hide-fidelity D. hide-finger UNIT 2: COMPONENT VALUES Resistors ______ with colored band to ease the problem of marking such small components.A. code B. codedC. are coded @ D. is coded In a coded resistor, the forth band indicate___A. the tolerance@ B. first digitC. forth digit D. number of zero following If the forth band of a coded resistor is red, it means thatA. the tolerance is 2% @ B. the tolerance is 5%C. the tolerance is 10% D. the tolerance is 20% Relaxing the tolerance of the resistor enables the manufacture to sell them more _____A. cheaper B. cheaply @C. cheaplier D. expensive The preferred value may seem _____ at first sight but this not so.A. illogic B. logicalC. illogical @ D. illogically Why do 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 expensivelyD. Because they can not do so The fist band of a colored-banding coded capacitor indicate___A. fist digit @ B. number of zeros followingC. tolerance D. voltage The forth band of a colored-banding coded capacitor indicate___A. fist digit B. number of zeros followingC. tolerance @ D. voltage The fifth band of a colored-banding coded capacitor indicate___A. fist digit B. number of zeros followingC. tolerance D. voltage @ Carbon resistors are _____compressed graphite which is formed into small tubesA. made of @ B. made inC. made from D. made to UNIT 3: RADIO Based on the way of travel, how many kinds of radio waves ?A. One kind: surface or ground waveA. Two kinds: surface wave and sky waveC. Three kinds: surface or ground wave, sky wave and space wave. @D. Four kinds: surface wave, ground wave, sky wave and space wave. Surface or ground wave travels along the ground, following the ____of the earth’s surface.A. curvature @ B. cultureC. line D. picture Which material (vật liệu) has poor conductor?A. water B. sand @C. A&B is correct D. A&B is incorrect Poor conductors absorb surface or ground wave more ____than good conductor.A. weakly B. easilyC. strongly @ D. hardly _____ 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 waveC. surface or ground wave and sky wave D. sky wave @ ______ consists of layers of air molecules stretching from about 80km above the earth to 500km.A. atmosphere B. troposphereC. ionosphere @ D. stratosphere VHF, UHF, and microwave signals are the _____A. space wave @ B. sky waveC. ground wave D. surface wave. When _____quickly, A cell may become hotA. discharge B. dischargedC. discharging@ D. A cell dischange The related noun(s) of the verb “Absorb” is/areA. absorber B. absorbtionC. absorption D. A&C are correct@ The related noun of the verb “conduct” is/areA. conducter B. conductedC. conductivity@ D. conducty AF is the abbreviation of_____A. Audio Function B. Audition FanC. Audio Frequency@ D. Audible Food RF is the abbreviation of_____A. Radio Frequence B. Radar Frequency C. Radio Frequency@ D. Road Frequency AM is the abbreviation of_____A. amplitude-modulated@ B. amplituding - modulatedC. amplituding - modulated D. amplitude - modulating FM is the abbreviation of_____A. frequency- modulating B. frequency-modulated@C. frequent- modulated D. frequent- modulating A typical radio tuner circuit consists of an inductor and capacitor and capacitor connected in ______A. paralel B. paraleledC. parallel@ D. paralleling UNIT 4: MAKING A RECORD Each vocalist, instrument, or group of instruments _____ linked to a microphone on a mixer or mixing desk.A. is @ B. areC. were D. have been The mixing desk allows the _____to adjust the recording level for each channelA. computing engineer B. telecommunicating engineerC. studio engineer @ D. All is correct The instruments are ______through the mixer into a multitrack tape recorderA. channel B. to channelC. be channelled D. channelled@ 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. asC. if D. as far as The ____sound is recorded on a two-track mastering machine to produce a master tapeA. editing B. edited@C. edit D. be edited Each instrument ______using a microphone.A. records B. recordingC. is recorded@ D. are recorded The remixed tape _______to produce a master tape A. is mastered down@ B. are mastered downC. is master down D. masters down the pits in the CDs represent the ____ audio pattern.A. analogue B. digital@C. electromagnetic D. magnetic the word “as” in the sentence “As the disc is revolved, a laser beam is used to mark audio information pattern on its surface” meansA. because B. when@C. equal D. for After punching the centre hole,a _____ is applied and the CD is packagedA. label@ B. a pit markC. a layer of plastic D. a box UNIT 5: COMPUTER The I/O (input/output) unit _____ of one or more ICs.A. has B. consistC. consists@ D. includes ______ is/are used to control the data going in and out of the computerA. I/O units @ B. ROMC. RAM D. address bus The small ROM _____ some permanent storageA. gives B. provides@C. give D. provide What is used for temporary storage?A. RAM@ B. ROMC. CPU D. register The contents of the RAM are constantly____.A. changing@ B. changeC. changes D. fixed What provides some permanent storage?A. RAM B. ROM@C. CPU D. register 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. ROMC. RAM D. data bus The ____ only operates while the computer is switched on.A. RAM@ B. ROMC. CPU D. gate CPU is the abbreviation ofA. centre processor unit B. control program unitC. central program union D. central processing unit@ What are buses in the computer used for?A. carrying the internal signal between each unit@B. transferring data between all the unitsC. sending control signals from the CPU to the other unitD. sending signals from the CPU which indicate the memory and I/O locations to be used What is used to transfer data between all the unitsA. data bus @ B. control busC. address bus D. processor bus 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 What is used to send signals from the CPU which indicates the memory and I/O locations?A. data bus B. control busC. address bus@ D. processor bus What is used to change AC voltages from small to large or from large to small?A. transformer@ B. diodeC. resistor D. capacity What is used to measure very small current?A. voltmeter B. miliammeter@C.milimeter D. meter What is used to check the logic level in the pins of ICs?A. VOM B. OscilloscopeC. logic probe @ D. Amp meter What is used as a part of a burglar alarm to detect movement?A. motion sensor@ B. automatic cut-offC. entry and exit relay D. battery backup What is used for the transmission of RF signal?A. detector B. radio setC. aerial @ D. receiver What is used for protecting circuits from surge in voltage?A. Diode B. Fuse@C. Resistor D. Switch What is used to master down different recordings to make a master tape?A. Microphone B. CDC. multi-track recorder D. mixer @ What is used to find buried metal?A. Radio B. RadarC. detector@ D. TV What is the meaning of prefix semi-?A. haft @ B. fullC. all D. not thing What is the meaning of prefix de-?A. opposite of B. reverse of the action@C. far D. across What is the meaning of prefix dis-?A. opposite of @ B. reverse of the actionC. far D. across What is the meaning of prefix tele-?A. opposite of B. reverse of the actionC. far @ D. across What is the meaning of prefix tras-?A. opposite of B. reverse of the actionC. far D. across @ What is the meaning of prefix micro-?A. small @ B. manyC. big D. large What is the meaning of prefix multi-?A. small B. many @C. big D. large _____ is the digital switching circuit.A. logic gate @ B. VOMC. delay D. CB _____ is the logic gates whose output depends on the combination of its input.A. Flip-Flop B. combinational logic@C. IC D. CMOS _____ is the number of ICs used in a computer.A. chip count@ B. count chipC. scale of integration D. BJT ___ is an indication of the number of components used in an IC.A. chip count B. count chipC. scale of integration @ D. BJT What is another name for a NOT gate?A. inventor B. converterC. inter D. inverter@ What are two common families of logic ICs?A. TTL and CMOS @ B. BJT and CMOSC. TTL and FET D. BJT and FET TTL is the abbreviation of _____A. Transistor – Transfer logic B. Transistor – transistor LocationC. Transistor – Transfer Location D. Transistor – transistor Logic@ 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. VLSI is the abbreviation of _____A. Very Large Signal of IntegrationB. Very Large Scale of Integration @C. Very Long Scale of IntegrationD. Very Long Signal of Integration MSI is the abbreviation of _____A. Middle Scale of IntegrationB. Medium Scale of Integration @C. Medium Signal of IntegrationD. Middle Signal of Integration 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 chipC. Basic gatesD. logic symbol Which logic gate whose output is only high when all its inputs are high?A. OR B. AND@C. NAND D. NOR What is shown in an IC pin-out diagram?A. The output for all possible inputsB. the arrangement of the gates and the function of each pin on the chip@C. Basic gatesD. logic symbol _____ use bipolar transistors to form each gate.A. TTL ICs @ B. CMOS ICsC. BJT ICs D. FET ICs _____ use field effect transistors to form each gate.A. TTL ICs B. CMOS ICs @C. BJT ICs D. FET ICs _____ are better for battery-powered portable computers.A. TTL ICs B. CMOS ICs @C. BJT ICs D. FET ICs _____ are suitable for use in large, high speed computers.A. TTL ICs @ B. CMOS ICsC. BJT ICs D. FET ICs What is used to convert electrical signal into visible signal?A. detector B. generatorC. LDR D. Oscilloscope@ UNIT 6: REMOTE CONTROL The remote control unit contains keys and electronic components similar to those of a _______A. Computer B. Calculator @C. mixer D. detector The keys ______by a matrix of wires which cross beneath each individual keyA. is connected B. are to connectedC. are connected @ D. be connected Almost ______light is emitted from the LEDA. no visible @ B. not visibleC. visible D. no invisible ____signals are used to prevent interference from any constant infra-red background ‘noise’A. Pulse B. Pulsed @C. analogue D. Pulsing When the transmitter is switched on, _____signals are sent from the transmitter to the receiverA. micro wave B. ultra-violetC. infra-red @ D. analogue A code ___by the length and spacing of these pulses switches on the LEDA. spelling out B. spelted outC. be spelt out D. spelt out @ The electrical pulses are converted by the ___into pulsed infra-red radiation which is directed at the receiverA. LED @ B. LDRC. transistor D. resistor The frequency of the oscillator is set by the _____ timing components R1,R2, and C1A. internal B. internationalC. external @ D. externally The current output of the amplifier is controlled by the resistor R3 which is connect in _____with the LEDA. series @ B. seryC. serial d. serially UNIT 7: ALARM SYSTEM 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. trippedC. trips @ D. would trip Which devices respond to the shock of the glass being broken?A. Radios B. vibration sensors @C. pressure mats D. magnetic witches ______ are fitted under the carpet-at the bottom of the stairs.A. magnetic switch B. break detectorC. pressure mats @ D. motion sensor 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 onC. Because they are easy to be brokenD. another reason Motion sensors may use passive infra-red, ultrasonic or microwave energy to detect _____within their rangeA. sound B. lightC. heat D. movement @ When light falls on the LDR, its resistance ___A. decreases @ B. decreaseC. increases D. increase The transistor switches between cut-off and ____as the input resistance changes.A. cut-on B. cut-outC. saturation @ D. interference A diode is connected in reverse bias across the relay to prevent large back ___A. EMF B. FMEC. electromotive force D. A and C are correct @ ___material is easily magnetized and demagnetizedA. magnetic B. FerricC. Ferromagnetic @ D. iron The envelope contains____, which helps to prevent corrosion of the contacts.A. nitrogen @ B. hydrogenC. oxygen B. water “You won’t set off the alarm when leaving or returning to the house”. This is –the _____ feature of alarm systemA. Entry and exit relay @ B. automatic cut-offC. tamper protection D. battery backup “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 systemA. Entry and exit relay B. automatic cut-off @C. tamper protection D. battery backup “The control panel incorporates sensors which will trigger the alarm if a burglar tries to force the box open”. This is _____ feature of alarm systemA. Entry and exit relay B. automatic cut-offC. tamper protection @ D. battery backup @ “If an intruder disconnects the main supply, the alarm will continue to work in a power cut”. This is _____ feature of alarm systemA. Entry and exit relay B. automatic cut-offC. tamper protection D. battery backup @ The opposite of cut-off isA. cut-on B. cut-inC. situation @ D. cut-in The opposite of increase isA. up B. forwardC. decrease @ D. unincrease The opposite of fixed resistor isA. light resistor B. variable resistor @C. LED D. coal resistor The opposite of energize isA. de-energize @ B. un-energizeC. dis-energize D. forward-energize The opposite of slow isA. fast @ B. bigC. large D. small The opposite of forward bias isA. backward bias B. reserve bias @C. back bias D. up bias UNIT 8: METAL DETECTOR Despite their technical_____, metal detector are based on a few very simple principles.A. complexity @ B. complexC. easy D. combine At fist, metal detectors were developed for military (quân sự) purposes to locate hidden___.A. metal B. rare findC. worthless item D. explosive @ (chất nổ) Metal detectors operate on the principle of_______ inductionA. electronic B. electromagnetic @C. electrical D. magnetic Metals are ____.A. semiconductors B. not conductorsC. conductors @ D. liquid A coin buried horizontally is ________ to detect than the same coin buried vertically.A. harder B. easier @C. more harder D. more easy When an AC voltage is applied to the search coil, a ____field is produceA. magnetic @ B. electronicC. electrical D. electric The __ voltage is converted into audible note by the circuitry in the control box.A. inducing B. induced @B. be induced D. be inducing A microphone may be used to ___ soundA. detect @ B. induceC. generate D. make Electrical pulsed are fist ____at a frequency in the upper audio range by the audio oscillator.A. generated @ B. inducedC. detected D. generating The oscillator ____ pulses at a fixed frequency of 32 786 HzA. generate B. generates @C. induce D. induced What is used to convert digital signal into analogue signal?A. DAC converter @ B. ADC converter.C. DCA converter D. ACD converter What is used to convert analogue signal into digital signal?A. DAC converter B. ADC converter @C. DCA converter D. ACD converter What is used to convert AC into DC?A. rectifier @ B. ADC converter C. transformer D. relay What is used to convert electronic pulse into infra-red pulse?A. LED @ B. LDRC. LCD D. relay 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 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 More and _____electronic goods are being sold, especially computers, radio telephones, and leisure products.A. more@ B. lessC. most D. the more Most domestic appliances now ______ some form of electronic controlA. be B. wasC. is D. are@ More engineer are ___to design, plan, manufacture and installA. require B. requiringC. required @ D. be required Service engineers are particularly _____ demand.A. on @ B. inC. at D. onto Aircraft electronic equipment has to ______to a very high standard with rigorous checks at set intervalsA. be maintained @ B. maintainedB. be maintain D. maintaining LAN is the abbreviation of A. Local Area Network B. Logical Area NetworkC. Large Area Networking D. Long Area Noun Defense systems require not only engineers to design them, ____ highly-skilled operators to man them and maintain them.A. but also B. butC. A and B is correct @ C. A and B is incorrect Automation has led to saving for the manufacturer but has also contributed to __A. unemployment@ B. employmentC. employ D. unemployed People today expect to be able to get in touch ____ each other at any time and in any placeA. to B. with@C. from D. for Society ____a wide range of leisure electronic items A. expects B. expectC. have expected D. expecting Recent years have seen a sharp ___in equipment for patient care.A. increase B. increasedC. is increase D. All is incorrect -----THE END------