Đề cương ôn thi anh văn chuyên nghành điện tử
1. Electronics began ____the start of twentieth century with the invention of the vacuum tube
A. at@ B. in
C. on D. with
2. 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
3. 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
4. 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.
5. 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.
Bạn đang xem nội dung tài liệu Đề cương ôn thi anh văn chuyên nghành điện tử, để tải tài liệu về máy bạn click vào nút DOWNLOAD ở trên
igital switching circuit. A. logic gate @ B. VOM C. 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 chip C. scale of integration D. BJT ___ is an indication of the number of components used in an IC. A. chip count B. count chip C. scale of integration @ D. BJT What is another name for a NOT gate? A. inventor B. converter C. inter D. inverter@ What are two common families of logic ICs? A. TTL and CMOS @ B. BJT and CMOS C. TTL and FET D. BJT and FET TTL is the abbreviation of _____ A. Transistor – Transfer logic B. Transistor – transistor Location C. 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 Integration B. Very Large Scale of Integration @ C. Very Long Scale of Integration D. Very Long Signal of Integration 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 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 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 inputs B. the arrangement of the gates and the function of each pin on the chip@ C. Basic gates D. logic symbol _____ use bipolar transistors to form each gate. A. TTL ICs @ B. CMOS ICs C. 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 ICs C. BJT ICs D. FET ICs What is used to convert electrical signal into visible signal? A. detector B. generator C. 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 key A. is connected B. are to connected C. are connected @ D. be connected Almost ______light is emitted from the LED A. no visible @ B. not visible C. 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 receiver A. micro wave B. ultra-violet C. infra-red @ D. analogue 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 @ 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 The frequency of the oscillator is set by the _____ timing components R1,R2, and C1 A. internal B. international C. external @ D. externally 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 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 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 detector C. 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 on C. Because they are easy to be broken D. another reason Motion sensors may use passive infra-red, ultrasonic or microwave energy to detect _____within their range A. sound B. light C. heat D. movement @ When light falls on the LDR, its resistance ___ A. decreases @ B. decrease C. increases D. increase The transistor switches between cut-off and ____as the input resistance changes. A. cut-on B. cut-out C. saturation @ D. interference 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 @ ___material is easily magnetized and demagnetized A. magnetic B. Ferric C. Ferromagnetic @ D. iron The envelope contains____, which helps to prevent corrosion of the contacts. A. nitrogen @ B. hydrogen C. oxygen B. water “You won’t set off the alarm when leaving or returning to the house”. This is –the _____ feature of alarm system A. Entry and exit relay @ B. automatic cut-off C. 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 system A. 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 system A. Entry and exit relay B. automatic cut-off C. 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 system A. Entry and exit relay B. automatic cut-off C. tamper protection D. battery backup @ The opposite of cut-off is A. cut-on B. cut-in C. situation @ D. cut-in The opposite of increase is A. up B. forward C. decrease @ D. unincrease The opposite of fixed resistor is A. light resistor B. variable resistor @ C. LED D. coal resistor The opposite of energize is A. de-energize @ B. un-energize C. dis-energize D. forward-energize The opposite of slow is A. fast @ B. big C. large D. small The opposite of forward bias is A. 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. complex C. easy D. combine 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) Metal detectors operate on the principle of_______ induction A. electronic B. electromagnetic @ C. electrical D. magnetic Metals are ____. A. semiconductors B. not conductors C. 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 produce A. magnetic @ B. electronic C. 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 ___ sound A. detect @ B. induce C. generate D. make Electrical pulsed are fist ____at a frequency in the upper audio range by the audio oscillator. A. generated @ B. induced C. detected D. generating The oscillator ____ pulses at a fixed frequency of 32 786 Hz A. 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. LDR C. 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. less C. most D. the more Most domestic appliances now ______ some form of electronic control A. be B. was C. is D. are@ More engineer are ___to design, plan, manufacture and install A. require B. requiring C. required @ D. be required Service engineers are particularly _____ demand. A. on @ B. in C. at D. onto 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 LAN is the abbreviation of A. Local Area Network B. Logical Area Network C. 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. but C. 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. employment C. employ D. unemployed 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 Society ____a wide range of leisure electronic items A. expects B. expect C. have expected D. expecting Recent years have seen a sharp ___in equipment for patient care. A. increase B. increased C. is increase D. All is incorrect -----THE END------
File đính kèm:
decuong_avcn_dientu_2359.doc
