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Trang 1DE CUONG ON THI ANH VAN CHUYEN NGHANH DIEN TU
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1 Electronics began _ the start of twentieth century with the invention of the vacuum tube
2 It was not until 1958 that microelectronics began with the development of
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on silicon chips
Electronics timers _in digital alarm clocks, water heaters, electric cookers and microwave ovens
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
Ina 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
Ina 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
C consist of D A & B is correct@
A tuner, a detector, and an AF amplifier the radio
Ina simple radio, the tuner _ to the detector
C is connecting D A & B is correct@
The volume control consists of a ten-microfarad electrolytic capacitor connected with a five-kilohm potentiometer (POT)
What is used to convert sounds into audio frequency signal?
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12 What is used to amplify the power of the modulated carrier wave?
A RF power amplifier@ B amplifier
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
15 hi-fi is the abbreviation of
16 Resistors with colored band to ease the problem of marking such small
components
17 Ina coded resistor, the forth band indicate _
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
20 The preferred value may seem at first sight but this not so
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
23 The forth band of a colored-banding coded capacitor indicate
Trang 324 The fifth band of a colored-banding coded capacitor indicate _
25 Carbon resistors are compressed graphite which is formed into small tubes
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
28 Which material (vat liéu) 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
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
32 VHF, UHF, and microwave signals are the
33 When quickly, A cell may become hot
34 The related noun(s) of the verb “Absorb” is/are
35 The related noun of the verb “conduct” is/are
36 AF is the abbreviation of
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37 RF is the abbreviation of
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
41.Each vocalist, instrument, or group of instruments linked to a microphone
on a mixer or mixing desk
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
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
45.The _ sound is recorded on a two-track mastering machine to produce a master
tape
46.Each instrument using a microphone
47 The remixed tape to produce a master tape
A is mastered down@ B are mastered down
48 the pits inthe CDs represent the audio pattern
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
Trang 550 After punching the centre hole,a _ is applied and the CD is packaged
51 The I/O (input/output) unit of one or more ICs
52 is/are used to control the data going in and out of the computer
53 The small ROM some permanent storage
54 What is used for temporary storage?
55 The contents of the RAM are constantly
56 What provides some permanent storage?
57 Which part of the computer controls the rest of the system and performs all the
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arithmetic and logic operations on the data?
A CPU@ B ROM
The _ only operates while the computer is switched on
A RAM@ B ROM
CPU is the abbreviation of
A centre processor unit B control program unit
C 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 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
What is used to transfer data between all the units
What is used to send control signals from the CPU to the other unit?
What is used to send signals from the CPU which indicates the memory and I/O locations?
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What is used to change AC voltages from small to large or from large to small?
What is used to measure very small current?
What is used to check the logic level in the pins of ICs?
What is used as a part of a burglar alarm to detect movement?
C entry and exit relay D battery backup
What is used for the transmission of RF signal?
What is used for protecting circuits from surge in voltage?
What is used to master down different recordings to make a master tape?
C multi-track recorder D mixer @
What is used to find buried metal?
What is the meaning of prefix semi-?
What is the meaning of prefix de-?
What is the meaning of prefix dis-?
A opposite of @ B reverse of the action
What is the meaning of prefix tele-?
A opposite of B reverse of the action
What is the meaning of prefix tras-?
A opposite of B reverse of the action
What is the meaning of prefix micro-?
What is the meaning of prefix multi-?
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is the digital switching circuit
A logic gate @ B VOM
is the logic gates whose output depends on the combination of its input
is the number of ICs used in a computer
C scale of integration D BJT
_ is an indication of the number of components used in an IC
C scale of integration @ D BJT
What is another name for a NOT gate?
What are two common families of logic ICs?
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
MSL 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?
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
93 use field effect transistors to form each gate
C BJT ICs D FET ICs
94 are better for battery-powered portable computers
95 are suitable for use in large, high speed computers
96 What is used to convert electrical signal into visible signal?
97 The remote control unit contains keys and electronic components similar to those ofa
98 The keys by a matrix of wires which cross beneath each individual key
A is connected
C are connected @
B are to connected
D be connected
99 Almost light is emitted from the LED
100 signals are used to prevent interference from any constant infra-red
background ‘noise’
101 When the transmitter is switched on,
to the receiver
A micro wave
C infra-red @
signals are sent from the transmitter
B ultra-violet
D analogue
102 Acode _ by the length and spacing of these pulses switches on the LED
A spelling out
C be spelt out
B spelted 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 @
C transistor
B LDR
D resistor
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104 The frequency of the oscillator is set by the timing components R1,R2, and Cl
105 The current output of the amplifier is controlled by the resistor R3 which is connect in with the LED
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
107 Which devices respond to the shock of the glass being broken?
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
111 When light falls on the LDR, its resistance
112 The transistor switches between cut-offand as the input resistance changes
C saturation @ D interference
113 A diode is connected in reverse bias across the relay to prevent large back _
C electromotive force D A and C are correct @
114 material is easily magnetized and demagnetized
C Ferromagnetic @ D iron
115 The envelope contains , which helps to prevent corrosion of the contacts
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 “Ifan 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
121 The opposite of increase is
122 The opposite of fixed resistor is
A light resistor
Cc LED
123 The opposite of energize is
A de-energize @
C dis-energize
124 The opposite of s/ow is
variable resistor @ coal resistor
un-energize forward-energize
125 The opposite of forward bias is
A backward bias B reserve bias @
126 Despite their technical „ metal detector are based on a few very simple principles
127 At fist, metal detectors were developed for military (quan sw) purposes to locate hidden
C worthless item D explosive @ (chất nỗ)
128 Metal detectors operate on the principle of induction