ĐỀ CƯƠNG ÔN THI ANH VĂN CHUYÊN NGHÀNH ĐIỆN TỬ

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ĐỀ CƯƠNG ÔN THI ANH VĂN CHUYÊN NGHÀNH ĐIỆN TỬ
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Unit 1: ELECTRONICS IN THE HOME
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.
6. 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.
7. 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@
8. A tuner, a detector, and an AF amplifier___ the radio.
A. comprise ( bao gồm)@ B. combine
C. consist D. compose
9. 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


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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 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 expensively
D. Because they can not do 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




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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



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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



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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?


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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


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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@


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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



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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


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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



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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.


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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




D. Al l




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