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.

 

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igital 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
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