Technician Class License Question Pool [复制链接]

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----- part 2 -----

[q] who is responsible for proper operation if you transmit from another amateur's station?
[a] both of you

[q] what operating privileges are allowed when another amateur holding a higher class license is controlling your station?
[a] all privileges allowed by the higher class license

[q] what operating privileges are allowed when you are the control operator at the station of another amateur who has a higher class license than yours?
[a] only the privileges allowed by your license

[q] which of the following is a prohibited amateur radio transmission?
[a] using amateur radio for conducting business

[q] what is the definition of third-party communications?
[a] a message sent between two amateur stations for someone else

[q] how many persons are required to be members of a club for a club station license to be issued by the fcc?
[a] at least 4

[q] when may you operate your amateur station aboard an aircraft?
[a] only with the approval of the pilot in command and not using the aircraft's radio equipment

[q] when is the fcc allowed to inspect your station equipment and station records?
[a] at any time upon request

[q] how might you best keep unauthorized persons from using your amateur station?
[a] disconnect the power and microphone cables when not using your equipment

[q] why are unlicensed persons in your family not allowed to transmit on your amateur station if you are not there?
[a] they must be licensed before they are allowed to be control operators

[q] when is it permissible for the control operator of a club station to accept compensation for sending information bulletins or morse code practice?
[a] when the station makes those transmissions for at least 40 hours per week

[q] which of the following should you do when selecting a frequency on which to transmit?
[a] listen to determine if the frequency is busy

[q] how do you call another station on a repeater if you know the station's call sign?
[a] say the station's call sign then identify your own station

[q] how do you indicate you are looking for any station with which to make contact?
[a] cq followed by your callsign

[q] what should you transmit when responding to a call of cq?
[a] the other station’s callsign followed by your callsign

[q] what term describes a brief test transmission that does not include any station identification?
[a] an illegal unidentified transmission

[q] what must an amateur do when making a transmission to test equipment or antennas?
[a] properly identify the station

[q] which of the following is true when making a test transmission?
[a] station identification is required at least every ten minutes and at the end of every transmission.

[q] what is the meaning of the procedural signal "cq"?
[a] calling any station

[q] why should you avoid using cute phrases or word combinations to identify your station?
[a] they are not easily understood by some operators

[q] what brief statement is often used in place of "cq" to indicate that you are listening for calls on a repeater?
[a] say your call sign

[q] why should you use the international telecommunication union (itu) phonetic alphabet when identifying your station?
[a] the words are internationally recognized substitutes for letters

[q] what is a band plan?
[a] a voluntary guideline, beyond the divisions established by the fcc for using different operating modes within an amateur band

[q] which of the following statements is true of band plans?
[a] they are voluntary guidelines for efficient use of the radio spectrum

[q] who developed the band plans used by amateur radio operators?
[a] the amateur community

[q] who is in charge of the repeater frequency band plan in your local area?
[a] the recognized frequency coordination body

[q] what is the main purpose of repeater coordination?
[a] to reduce interference and promote proper use of spectrum

[q] who is accountable if a repeater station inadvertently retransmits communications that violate fcc rules?
[a] the transmitting station

[q] which of these statements is true about legal power levels on the amateur bands?
[a] an amateur must use the minimum transmitter power necessary to carry out the desired communication

[q] which of the bands available to technician class licensees have mode restricted sub-bands?
[a] the 6-meter, 2-meter, and 1 1/4-meter bands

[q] what emission modes are permitted in the restricted sub-band at 50.0-50.1 mhz?
[a] cw only

[q] what emission modes are permitted in the restricted sub-band at 144.0-144.1 mhz?
[a] cw only

[q] what is the proper way to break into a conversation between two stations that are using the frequency?
[a] say your call sign between their transmissions

[q] what is considered to be proper repeater operating practice?
[a] all of these answers are correct

[q] what should you do before responding to another stations call?
[a] make sure you are operating on a permissible frequency for your license class

[q] what rule applies if two amateur stations want to use the same frequency?
[a] no frequency will be assigned for the exclusive use of any station and neither has priority

[q] why is indecent and obscene language prohibited in the amateur service?
[a] all of these choices are correct

[q] why should amateur radio operators avoid the use of racial or ethnic slurs when talking to other stations?
[a] it is offensive to some people and reflects a poor public image on all amateur radio operators

[q] what should you do if you hear a newly licensed operator that is having trouble with their station?
[a] contact them and offer to help with the problem

[q] where can an official list be found of prohibited obscene and indecent words that should not be used in amateur radio?
[a] there is no official list of prohibited obscene and indecent words

[q] what type of subjects are not prohibited communications while using amateur radio?
[a] all of these answers are correct

[q] when circumstances are not specifically covered by fcc rules, what general operating standard must be applied to amateur station operation?
[a] good engineering and amateur practices

[q] what should you do if you receive a report that your transmissions are causing splatter or interference on nearby frequencies?
[a] check transmitter for off frequency operation or spurious emissions

[q] who is responsible for taking care of the interference if signals from your transmitter are causing front end overload in your neighbor's television receiver?
[a] the owner of the television receiver is responsible

[q] what is the major cause of telephone interference?
[a] the telephone was not equipped with adequate interference protection when manufactured.

[q] what is the proper course of action if you unintentionally interfere with another station?
[a] properly identify your station and move to a different frequency

[q] when may you deliberately interfere with another station's communications?
[a] never

[q] who has exclusive use of a specific frequency when the fcc has not declared a communication emergency?
[a] no station has exclusive use of any frequency

[q] what effect might a break in a cable television transmission line have on amateur communications?
[a] tv interference may result when the amateur station is transmitting, or interference may occur to the amateur receiver

[q] what is the best way to reduce on the air interference when testing your transmitter?
[a] use a dummy load when testing

[q] what rules apply to your station when using amateur radio at the request of public service officials or at the scene of an emergency?
[a] fcc

[q] what do races and ares have in common?
[a] both organizations provide communications during emergencies

[q] what is meant by receiver front-end overload?
[a] interference caused by strong signals from a nearby source

[q] electrical current is measured in which of the following units?
[a] amperes

[q] electrical power is measured in which of the following units?
[a] watts

[q] what is the name for the flow of electrons in an electric circuit?
[a] current

[q] what is the name of a current that flows only in one direction?
[a] a direct current

[q] what is the standard unit of frequency?
[a] the hertz

[q] how much voltage does an automobile battery usually supply?
[a] about 12 volts

[q] what is the basic unit of resistance?
[a] the ohm

[q] what is the name of a current that reverses direction on a regular basis?
[a] an alternating current

[q] which of the following is a good electrical conductor?
[a] copper

[q] which of the following is a good electrical insulator?
[a] glass

[q] what is the term used to describe opposition to current flow in ordinary conductors such as wires?
[a] resistance

[q] what instrument is used to measure the flow of current in an electrical circuit?
[a] ammeter

[q] what instrument is used to measure electromotive force (emf) between two points such as the poles of a battery?
[a] voltmeter

[q] what is the name for the distance a radio wave travels during one complete cycle?
[a] wavelength

[q] what term describes the number of times that an alternating current flows back and forth per second?
[a] frequency

[q] what does 60 hertz (hz) mean?
[a] 60 cycles per second

[q] electromagnetic waves that oscillate more than 20,000 times per second as they travel through space are generally referred to as what?
[a] radio waves

[q] how fast does a radio wave travel through space?
[a] at the speed of light

[q] how does the wavelength of a radio wave relate to its frequency?
[a] the wavelength gets shorter as the frequency increases

[q] what is the formula for converting frequency to wavelength in meters?
[a] wavelength in meters equals 300 divided by frequency in megahertz

[q] what are sound waves in the range between 300 and 3000 hertz called?
[a] voice frequencies

[q] what property of a radio wave is often used to identify the different bands amateur radio operators use?
[a] the physical length of the wave

[q] what is the frequency range of the 2 meter band in the united states?
[a] 144 to 148 mhz

[q] what is the frequency range of the 6 meter band in the united states?
[a] 50 to 54 mhz

[q] what is the frequency range of the 70 centimeter band in the united states?
[a] 420 to 450 mhz

----- part 3 -----

[q] what is used to convert radio signals into sounds we can hear?
[a] receiver

[q] what is used to convert sounds from our voice into radio signals?
[a] transmitter

[q] what two devices are combined into one unit in a transceiver?
[a] receiver, transmitter

[q] what device is used to convert the alternating current from a wall outlet into low-voltage direct current?
[a] power supply

[q] what device is used to increase the output of a 10 watt radio to 100 watts?
[a] amplifier

[q] which of the battery types listed below offers the longest life when used with a hand-held radio, assuming each battery is the same physical size?
[a] lithium-ion

[q] what is the nominal voltage per cell of a fully charged nickel- cadmium battery?            
[a] 1.2 volts

[q] what battery type on this list is not designed to be re-charged?
[a] carbon-zinc

[q] what is required to keep rechargeable batteries in good condition and ready for emergencies?
[a] all of these answers are correct

[q] what is the best way to get the most amount of energy from a battery?
[a] draw current from the battery at the slowest rate needed

[q] what formula is used to calculate current in a circuit?
[a] current (i) equals voltage (e) divided by resistance (r)

[q] what formula is used to calculate voltage in a circuit?
[a] voltage (e) equals current (i) multiplied by resistance (r)

[q] what formula is used to calculate resistance in a circuit?
[a] resistance (r) equals voltage (e) divided by current (i)

[q] what is the resistance of a circuit when a current of 3 amperes flows through a resistor connected to 90 volts?
[a] 30 ohms

[q] what is the resistance in a circuit where the applied voltage is 12 volts and the current flow is 1.5 amperes?
[a] 8 ohms

[q] what is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
[a] 1.5 amperes

[q] what is the voltage across the resistor if a current of 0.5 amperes flows through a 2 ohm resistor?
[a] 1 volt

[q] what is the voltage across the resistor if a current of 1 ampere flows through a 10 ohm resistor?
[a] 10 volts

[q] what is the voltage across the resistor if a current of 2 amperes flows through a 10 ohm resistor?
[a] 20 volts

[q] what is the current flowing through a 100 ohm resistor connected across 200 volts?
[a] 2 amperes

[q] what is the current flowing through a 24 ohm resistor connected across 240 volts?
[a] 10 amperes

[q] what unit is used to describe electrical power?
[a] watt

[q] what is the formula used to calculate electrical power in a dc circuit?
[a] power (p) equals voltage (e) multiplied by current (i)

[q] how much power is represented by a voltage of 13.8 volts dc and a current of 10 amperes?
[a] 138 watts

[q] how much power is being used in a circuit when the voltage is 120 volts dc and the current is 2.5 amperes?
[a] 300 watts

[q] how can you determine how many watts are being drawn by your transceiver when you are transmitting?
[a] measure the dc voltage at the transceiver and multiply by the current drawn when you transmit

[q] how many amperes are flowing in a circuit when the applied voltage is 120 volts dc and the load is 1200 watts?
[a] 10 amperes

[q] how many milliamperes is the same as 1.5 amperes?
[a] 1500 milliamperes

[q] what is another way to specify the frequency of a radio signal that is oscillating at 1,500,000 hertz?
[a] 1500 khz

[q] how many volts are equal to one kilovolt?
[a] one thousand volts

[q] how many volts are equal to one microvolt?
[a] one one-millionth of a volt

[q] how many watts does a hand-held transceiver put out if the output power is 500 milliwatts?
[a] 0.5 watts

[q] what does a microphone connect to in a basic amateur radio station?
[a] the transmitter

[q] which piece of station equipment converts electrical signals to sound waves?
[a] speaker

[q] what is the term used to describe what happens when a microphone and speaker are too close to each other?
[a] audio feedback

[q] what could you use in place of a regular speaker to help you copy signals in a noisy area?
[a] a set of headphones

[q] what is a good reason for using a regulated power supply for communications equipment?
[a] to protect equipment from voltage fluctuations

[q] where must a filter be installed to reduce spurious emissions?
[a] at the transmitter

[q] what type of filter should be connected to a tv receiver as the first step in trying to prevent rf overload from a nearby 2-meter transmitter?
[a] notch filter

[q] what is connected between the transceiver and computer terminal in a packet radio station?
[a] terminal node controller

[q] which of these items is not required for a packet radio station?
[a] microphone

[q] what can be used to connect a radio with a computer for data transmission?
[a] sound card

[q] what may happen if a transmitter is operated with the microphone gain set too high?
[a] it may cause the signal to become distorted and unreadable

[q] what kind of information may a vhf/uhf transceiver be capable of storing in memory?
[a] all of these answers are correct

[q] what is one way to select a frequency on which to operate?
[a] use the keypad or vfo knob to enter the correct frequency

[q] what is the purpose of the squelch control on a transceiver?
[a] it is used to quiet noise when no signal is being received

[q] what is a way to enable quick access to a favorite frequency on your transceiver?
[a] store the frequency in a memory channel

[q] what might you do to improve the situation if the station you are listening to is hard to copy because of ignition noise interference?
[a] turn on the noise blanker

[q] what is the purpose of the buttons labeled "up" and "down" on many microphones?
[a] to allow easy frequency or memory selection

[q] what is the purpose of the "shift" control found on many vhf/uhf transceivers?
[a] adjust the offset between transmit and receive frequency

[q] what does rit mean?
[a] receiver incremental tuning

[q] what is the purpose of the "step" menu function found on many transceivers?
[a] it sets the tuning rate when changing frequencies

[q] what is the purpose of the "function" or "f" key found on many transceivers?
[a] it selects an alternate action for some control buttons

[q] what is one purpose of a repeater?
[a] to extend the usable range of mobile and low-power stations

[q] what is a courtesy tone?
[a] a tone used to indicate when a transmission is complete

[q] which of the following is the most important information to know before using a repeater?
[a] the repeater input and output frequencies

[q] why should you pause briefly between transmissions when using a repeater?
[a] to listen for anyone wanting to break in

[q] what is the most common input/output frequency offset for repeaters in the 2-meter band?
[a] 0.6 mhz

[q] what is the most common input/output frequency offset for repeaters in the 70-centimeter band?
[a] 5.0 mhz

[q] what is meant by the terms input and output frequency when referring to repeater operations?
[a] the repeater receives on one frequency and transmits on another

[q] what is the meaning of the term simplex operation?
[a] transmitting and receiving on the same frequency

[q] what is a reason to use simplex instead of a repeater?
[a] to avoid tying up the repeater when direct contact is possible

[q] how might you find out if you could communicate with a station using simplex instead of a repeater?
[a] check the repeater input frequency to see if you can hear the other station

[q] what is the term for a series of repeaters that can be connected to one another to provide users with a wider coverage?
[a] linked repeater system

[q] what is the main reason repeaters should be approved by the local frequency coordinator before being installed?
[a] coordination minimizes interference between repeaters and makes the most efficient use of available frequencies

[q] which of the following statements regarding use of repeaters is true?
[a] access to any repeater may be limited by the repeater owner

[q] what term is used to describe a repeater when use is restricted to the members of a club or group?
[a] a closed repeater

[q] what is meant by fundamental overload in reference to a receiver?
[a] interference caused by very strong signals from a nearby source

[q] which of the following is not a cause of radio frequency interference?
[a] doppler shift

[q] what is the most likely cause of telephone interference from a nearby transmitter?
[a] the transmitter's signals are causing the telephone to act like a radio receiver

[q] what is a logical first step when attempting to cure a radio frequency interference problem in a nearby telephone?
[a] install an rf filter at the telephone

[q] what should you do first if someone tells you that your transmissions are interfering with their tv reception?
[a] make sure that your station is operating properly and that it does not cause interference to your own television

[q] which of the following may be useful in correcting a radio frequency interference problem?
[a] all of these answers are correct

[q] what is the proper course of action to take when a neighbor reports that your radio signals are interfering with something in his home?
[a] check your station and make sure it meets the standards of good amateur practice

[q] what should you do if a "part 15" device in your neighbor's home is causing harmful interference to your amateur station?
[a] all of these answers are correct

[q] what could be happening if another operator tells you he is hearing a variable high-pitched whine on the signals from your mobile transmitter?
[a] the power wiring for your radio is picking up noise from the vehicle's electrical system

[q] what may be the problem if another operator reports that your ssb signal is very garbled and breaks up?
[a] rf energy may be getting into the microphone circuit and causing feedback

[q] what might be the problem if you receive a report that your signal through the repeater is distorted or weak?
[a] all of these answers are correct

[q] what is one of the reasons to use digital signals instead of analog signals to communicate with another station?
[a] many digital systems can automatically correct errors caused by noise and interference

----- part 4 -----

[q] what are phone transmissions?
[a] voice transmissions by radio

[q] which of the following is a form of amplitude modulation?
[a] single sideband

[q] what name is given to an amateur radio station that is used to connect other amateur stations to the internet?
[a] a gateway

[q] which type of voice modulation is most often used for long distance and weak signal contacts on the vhf and uhf bands?
[a] ssb

[q] which type of modulation is most commonly used for vhf and uhf voice repeaters?
[a] fm

[q] which emission type has the narrowest bandwidth?
[a] cw

[q] which sideband is normally used for vhf and uhf ssb communications?
[a] upper sideband

[q] what is the primary advantage of single sideband over fm for voice transmissions?
[a] ssb signals use much less bandwidth than fm signals

[q] what is the approximate bandwidth of a single-sideband voice signal?
[a] between 2 and 3 khz

[q] what is the approximate bandwidth of a frequency-modulated voice signal?
[a] between 5 and 15 khz

[q] what is the normal bandwidth required for a conventional fast-scan tv transmission using combined video and audio on the 70- centimeter band?
[a] about 6 mhz

[q] how is information transmitted between stations using echolink?
[a] internet

[q] what does the abbreviation irlp mean?
[a] internet radio linking project

[q] who may operate on the echolink system?
[a] any licensed amateur radio operator

[q] what technology do echolink and irlp have in common?
[a] voice over internet protocol

[q] what method is used to transfer data by irlp?
[a] voice over internet protocol

[q] what does the term irlp describe?
[a] a method of linking between two or more amateur stations using the internet

[q] which one of the following allows computer-to-radio linking for voice transmission?
[a] echolink

[q] what are you listening to if you hear a brief tone and then a station from russia calling cq on a 2-meter repeater?
[a] an internet linked dx station

[q] where might you find a list of active nodes using voip?
[a] a repeater directory or the internet

[q] when using a portable transceiver how do you select a specific irlp node?
[a] use the keypad to transmit the irlp node numbers

[q] which of the following is an example of a digital communications method?
[a] packet radio

[q] what does the term aprs mean?
[a] automatic position reporting system

[q] what item is required along with your normal radio for sending automatic location reports?
[a] a global positioning system receiver

[q] what type of transmission is indicated by the term ntsc?
[a] a standard fast scan color television signal

[q] what emission mode may be used by a technician class operator in the 219 - 220 mhz frequency range?
[a] point-to-point digital message forwarding

[q] what does the abbreviation psk mean?
[a] phase shift keying

[q] what is psk31?
[a] a low-rate data transmission mode that works well in noisy conditions

[q] what sending speed is recommended when using morse code?
[a] any speed at which you can reliably receive

[q] what is a practical reason for being able to copy cw when using repeaters?
[a] to recognize a repeater id sent in morse code

[q] what is the "q" signal used to indicate that you are receiving interference from other stations?
[a] qrm

[q] what is the "q" signal used to indicate that you are changing frequency?
[a] qsy

[q] what is a good thing to have when operating a hand-held transceiver away from home?
[a] one or more fully charged spare battery packs

[q] which of these items would probably not be very useful to include in an emergency response kit?
[a] a 1500 watt output linear amplifier

[q] how can you make the signal from a hand-held radio stronger when operating in the field?
[a] use an external antenna instead of the rubber-duck antenna

[q] what would be a good thing to have when operating from a location that includes lots of crowd noise?
[a] a combination headset and microphone

[q] what is a method used to locate sources of noise interference or jamming?
[a] radio direction finding

[q] which of these items would be the most useful for a hidden transmitter hunt?
[a] a directional antenna

[q] what is a popular operating activity that involves contacting as many stations as possible during a specified period of time?
[a] contesting

[q] what is a grid locator?
[a] a letter-number designator assigned to a geographic location

[q] what is a special event station?
[a] a temporary station that operates in conjunction with an activity of special significance

[q] what is the maximum power allowed when transmitting telecommand signals to radio controlled models?
[a] 1 watt

[q] what is the station identification requirement when sending commands to a radio control model using amateur frequencies?
[a] a label indicating the licensee's call sign and address must be affixed to the transmitter

[q] what class of license is required to use amateur satellites?
[a] any amateur whose license allows them to transmit on the satellite uplink frequency

[q] how much power should you use to transmit when using an amateur satellite?
[a] the minimum amount of power needed to complete the contact

[q] what is something you can do when using an amateur radio satellite?
[a] talk to amateur radio operators in other countries

[q] who may make contact with an astronaut on the international space station using amateur radio frequencies?
[a] any amateur with a technician or higher class license

[q] what is a satellite beacon?
[a] a signal that contains information about a satellite

[q] what should you use to determine when you can access an amateur satellite?
[a] a satellite tracking program

[q] what is doppler shift?
[a] a change in signal frequency caused by motion through space

[q] what is the name of the group that coordinates the building and/or launch of the largest number of amateur radio satellites?
[a] amsat

[q] what is a satellite sub-band?
[a] a portion of a band where satellite operations are permitted

[q] what is the satellite sub-band on 70-cm?
[a] 435 to 438 mhz

[q] what do the initials leo tell you about an amateur satellite?
[a] the satellite is in a low earth orbit

[q] what information is included in an fcc declaration of a temporary state of communication emergency?
[a] any special conditions and rules to be observed during the emergency

[q] under what conditions are amateur stations allowed to communicate with stations operating in other radio services?
[a] when specially authorized by the fcc, or in an actual emergency

[q] what should you do if you are in contact with another station and an emergency call is heard?
[a] stop your contact immediately and take the emergency call

[q] what are the restrictions on amateur radio communications after the fcc has declared a communications emergency?
[a] you must avoid those frequencies dedicated to supporting the emergency unless you are participating in the relief effort

[q] what is one reason for using tactical call signs such as "command post" or "weather center" during an emergency?
[a] they are more efficient and help coordinate public-service communications

[q] what is legally required to restrict a frequency to emergency-only communication?
[a] an fcc declaration of a communications emergency

[q] who has the exclusive use of a frequency if the fcc has not declared a communication emergency?
[a] no station has exclusive use in this circumstance

[q] what should you do if you hear someone reporting an emergency?
[a] assume the emergency is real and act accordingly

[q] what is an appropriate way to initiate an emergency call on amateur radio?
[a] say "mayday, mayday, mayday" followed by "any station come in please" and identify your station

[q] what are the penalties for making a false emergency call?
[a] all of these answers are correct

[q] what type of communications has priority at all times in the amateur radio service?
[a] emergency communications

[q] when must priority be given to stations providing emergency communications?
[a] at all times and on all frequencies

[q] what can you do to be prepared for an emergency situation where your assistance might be needed?
[a] all of these answers are correct

[q] when may you use your amateur station to transmit a "sos" or "mayday" signal?
[a] when there is immediate threat to human life or property

[q] what is the primary function of races in relation to emergency activities?
[a] races organizations are restricted to serving local, state, and federal government emergency management agencies

[q] what is the primary function of ares in relation to emergency activities?
[a] ares supports agencies like the red cross, salvation army, and national weather service

[q] what organization must you register with before you can participate in races activities?
[a] the responsible civil defense organization

[q] what is necessary before you can join an ares group?
[a] you must have an amateur radio license

[q] what could be used as an alternate source of power to operate radio equipment during emergencies?
[a] all of these answers are correct

[q] when can you use non-amateur frequencies or equipment to call for help in a situation involving immediate danger to life or property?
[a] in a genuine emergency you may use any means at your disposal to call for help on any frequency

[q] why should casual conversation between stations during a public service event be avoided?
[a] idle chatter may interfere with important traffic

[q] what should you do if a reporter asks to use your amateur radio transceiver to make a news report?
[a] advise them that the fcc prohibits such use

[q] when can you use a modified amateur radio transceiver to transmit on the local fire department frequency?
[a] in a genuine emergency you may use any means at your disposal to call for help on any frequency

[q] which type of traffic has the highest priority?
[a] emergency traffic

[q] what type of messages should not be transmitted over amateur radio frequencies during emergencies?
[a] personal information concerning victims

[q] what should you do to minimize disruptions to an emergency traffic net once you have checked in?
[a] do not transmit on the net frequency until asked to do so by the net control station

[q] what is one thing that must be included when passing emergency messages?
[a] the name of the person originating the message

[q] what is one way to reduce the chances of casual listeners overhearing sensitive emergency traffic?
[a] pass messages using a non-voice mode such as packet radio or morse code

[q] what is of primary importance for a net control station?
[a] a strong and clear signal

[q] what should the net control station do if someone breaks in with emergency traffic?
[a] stop all net activity until the emergency has been handled

[q] what should you do if a large scale emergency has just occurred and no net control station is available?
[a] open the emergency net immediately and ask for check-ins

[q] what is the preamble of a message?
[a] the information needed to track the message as it passes through the amateur radio traffic handling system

[q] what is meant by the term "check" in reference to a message?
[a] the check is a count of the number of words in the message

[q] what is the recommended guideline for the maximum number of words to be included in the text of an emergency message?
[a] 25 words

这么说来，老弟的element 2考试已经准备好了。祝贺一下。呵呵。

'

这么说来，老弟的element 2考试已经准备好了。祝贺一下。呵呵。

'

盛兄：尚未开始看，打算考试之前一周再看，这样印象深刻。我是今天正好没事，把pdf文件的内容整理出来，供其他朋友参考。

----- part 5 -----

[q] what is a beam antenna?
[a] an antenna that concentrates signals in one direction

[q] what is an antenna that consists of a single element mounted perpendicular to the earth's surface?
[a] a vertical antenna

[q] what type of antenna is a simple dipole mounted so the elements are parallel to the earth's surface?
[a] a horizontal antenna

[q] what is a disadvantage of the "rubber duck" antenna supplied with most hand held radio transceivers?
[a] it does not transmit or receive as effectively as a full sized antenna

[q] how does the physical size of half-wave dipole antenna change with operating frequency?
[a] it becomes shorter as the frequency increases

[q] what is the advantage of 5/8 wavelength over 1/4 wavelength vertical antennas?
[a] their radiation pattern concentrates energy at lower angles

[q] what is the primary purpose of a dummy load?
[a] it does not radiate interfering signals when making tests

[q] what type of antennas are the quad, yagi, and dish?
[a] directional or beam antennas

[q] what is one type of antenna that offers good efficiency when operating mobile and can be easily installed or removed?
[a] a magnet mount vertical antenna

[q] what is a good reason not to use a "rubber duck" antenna inside your car?
[a] signals can be 10 to 20 times weaker than when you are outside of the vehicle

[q] what is the approximate length, in inches, of a quarter-wavelength vertical antenna for 146 mhz?
[a] 19 inches

[q] what is the approximate length, in inches, of a 6-meter 1/2 wavelength wire dipole antenna?
[a] 112 inches

[q] why are vhf/uhf signals not normally heard over long distances?
[a] vhf and uhf signals are usually not reflected by the ionosphere

[q] what might be happening when we hear a vhf signal from long distances?
[a] a possible cause is sporadic e reflection from a layer in the ionosphere

[q] what is the most likely cause of sudden bursts of tones or fragments of different conversations that interfere with vhf or uhf signals?
[a] strong signals are overloading the receiver and causing undesired signals to be heard

[q] what is the radio horizon?
[a] the point where radio signals between two points are blocked by the curvature of the earth

[q] what should you do if a station reports that your signals were strong just a moment ago, but now they are weak or distorted?
[a] try moving a few feet, random reflections may be causing multi- path distortion.

[q] why do uhf signals often work better inside of buildings than vhf signals?
[a] the shorter wavelength of uhf signals allows them to more easily penetrate urban areas and buildings

[q] what is a good thing to remember when using your hand-held vhf or uhf radio to reach a distant repeater?
[a] keep the antenna as close to vertical as you can

[q] what can happen if the antennas at opposite ends of a vhf or uhf line of sight radio link are not using the same polarization?
[a] signals could be as much as 100 times weaker

[q] what might be a way to reach a distant repeater if buildings or obstructions are blocking the direct line of sight path?
[a] try using a directional antenna to find a path that reflects signals to the repeater

[q] what term is commonly used to describe the rapid fluttering sound sometimes heard from mobile stations that are moving while transmitting?
[a] picket fencing

[q] why do vhf and uhf radio signals usually travel about a third farther than the visual line of sight distance between 2 stations?
[a] the earth seems less curved to radio waves than to light

[q] what, in general terms, is standing wave ratio (swr)?
[a] a measure of how well a load is matched to a transmitter

[q] what reading on a swr meter indicates a perfect impedance match between the antenna and the feed line?
[a] 1 to 1

[q] what might be indicated by erratic changes in swr readings?
[a] a loose connection in your antenna or feedline

[q] what is the swr value where the protection circuits in most solid- state transmitters begin to reduce transmitter power?
[a] 2 to 1

[q] what happens to the power lost in a feed line?
[a] it is converted into heat by losses in the line

[q] what instrument other than a swr meter could you use to determine if your feedline and antenna are properly matched?
[a] directional wattmeter

[q] what is the most common reason for failure of coaxial cables?
[a] moisture contamination

[q] why is it important to have a low swr in an antenna system that uses coaxial cable feedline?
[a] to allow the efficient transfer of power and reduce losses

[q] what can happen to older coaxial cables that are exposed to weather and sunlight for several years?
[a] losses can increase dramatically

[q] why is the outer sheath of most coaxial cables black in color?
[a] black provides protection against ultraviolet damage

[q] what is the impedance of the most commonly used coaxial cable in typical amateur radio installations?
[a] 50 ohms

[q] why is coaxial cable used more often than any other feed line for amateur radio antenna systems?
[a] it is easy to use and requires few special installation considerations

[q] what is a commonly accepted value for the lowest voltage that can cause a dangerous electric shock?
[a] 30 volts

[q] what is the lowest amount of electrical current flowing through the human body that is likely to cause death?
[a] 100 milliamperes

[q] what is connected to the green wire in a three-wire electrical plug?
[a] ground

[q] what is the purpose of a fuse in an electrical circuit?
[a] to interrupt power in case of overload

[q] what might happen if you install a 20-ampere fuse in your transceiver in the place of a 5-ampere fuse?
[a] excessive current could cause a fire

[q] what is a good way to guard against electrical shock at your station?
[a] all of these answers are correct

[q] what is the most important thing to consider when installing an emergency disconnect switch at your station?
[a] everyone should know where it is and how to use it

[q] what precautions should be taken when a lightning storm is expected?
[a] all of these answers are correct

[q] what is one way to recharge a 12-volt battery if the commercial power is out?
[a] connect the battery to a car's battery and run the engine

[q] what kind of hazard is presented by a conventional 12-volt storage battery?
[a] all of these answers are correct

[q] what can happen if a storage battery is charged or discharged too quickly?
[a] the battery could overheat and give off dangerous gas or explode

[q] what is the most important reason to have a lightning protection system for your amateur radio station?
[a] fire prevention

[q] what kind of hazard might exist in a power supply when it is turned off and disconnected?
[a] you might receive an electric shock from stored charge in large capacitors

[q] why should you wear a hard hat and safety glasses if you are on the ground helping someone work on an antenna tower?
[a] to protect your head and eyes in case something accidentally falls from the tower

[q] what is a good precaution to observe before climbing an antenna tower?
[a] put on your safety belt and safety glasses

[q] what should you do before you climb a tower?
[a] all of these answers are correct

[q] what is an important consideration when putting up an antenna?
[a] make sure people cannot accidentally come into contact with it

[q] what must be considered when erecting an antenna near an airport?
[a] the maximum allowed height with regard to nearby airports

[q] what is the most important safety precaution to observe when putting up an antenna tower?
[a] look for and stay clear of any overhead electrical wires

[q] how should the guy wires for an antenna tower be installed?
[a] in accordance with the tower manufacturer's instructions

[q] what is a safe distance from a power line to allow when installing an antenna?
[a] so that if the antenna falls unexpectedly, no part of it can come closer than 10 feet to the power wires

[q] what is the most important safety rule to remember when using a crank-up tower?
[a] a crank-up tower should never be climbed unless it is in the fully lowered position

[q] why is stainless steel hardware used on many antennas instead of other metals?
[a] stainless steel parts are much less likely to corrode

[q] what is considered to be an adequate ground for a tower?
[a] separate 8 foot long ground rods for each tower leg, bonded to the tower and each other

[q] what type of radiation are vhf and uhf radio signals?
[a] non-ionizing radiation

[q] when can radio waves cause injury to the human body?
[a] only if the combination of signal strength and frequency cause excessive power to be absorbed

[q] what is the maximum power level that an amateur radio station may use at frequencies above 30 mhz before an rf exposure evaluation is required?
[a] 50 watts pep at the antenna

[q] what factors affect the rf exposure of people near an amateur transmitter?
[a] all of these answers are correct

[q] why must the frequency of an rf source be considered when evaluating rf radiation exposure?
[a] the human body absorbs more rf energy at some frequencies than others

[q] how can you determine that your station complies with fcc rf exposure regulations?
[a] all of these choices are correct

[q] what could happen if a person accidentally touched your antenna while you were transmitting?
[a] they might receive a painful rf burn injury

[q] what action might amateur operators take to prevent exposure to rf radiation in excess of fcc supplied limits?
[a] all of these answers are correct

[q] how can you make sure your station stays in compliance with rf safety regulations?
[a] by re-evaluating the station whenever an item of equipment is changed

[q] which of the following units of measurement is used to measure rf radiation exposure?
[a] milliwatts per square centimeter

[q] why is duty cycle one of the factors used to determine safe rf radiation exposure levels?
[a] it takes into account the amount of time the transmitter is operating

(end)

'

盛兄：尚未开始看，打算考试之前一周再看，这样印象深刻。我是今天正好没事，把pdf文件的内容整理出来，供其他朋友参考。

'

你只考element 2吗？
如果只考technician，现在开始看，考试一周前再过一遍不是印象更深吗？只看一遍印象不够深吧（如果你有自信也不妨试试，呵呵）。

问一下，可以直接考extra吗？

'

问一下，可以直接考extra吗？

'
不可以。但是理论上你可以在一天之内从technician考到extra。想试试吗？这次北京考试就有人要考到extra。（不过这次北京可以考两天。但分两天考的话要交两次考试费）

想知道上海什么时候有考试。考试只是做选择题吗？

'

不可以。但是理论上你可以在一天之内从technician考到extra。想试试吗？这次北京考试就有人要考到extra。（不过这次北京可以考两天。但分两天考的话要交两次考试费）

'

'

想知道上海什么时候有考试。考试只是做选择题吗？

'

曾经考虑过在北京考过后去上海考。但是由于ve日程太紧张，这次作罢。考虑在未定的“不远的将来”在北京以外的地点举行考试。你翻翻下面的内容：
http://www.hellocq.net/forum/showthread-t-210754.有想在国内通过fcc考试获得美国呼号的火腿朋友吗？.html
或者看看题库，应该可以回答你的问题。

谢谢，明白了。这次恐怕就不能去北京考试了，希望下次在上海考试的时候参加。

'

曾经考虑过在北京考过后去上海考。但是由于ve日程太紧张，这次作罢。考虑在未定的“不远的将来”在北京以外的地点举行考试。你翻翻下面的内容：
http://www.hellocq.net/forum/showthread-t-210754.有想在国内通过fcc考试获得美国呼号的火腿朋友吗？.html
或者看看题库，应该可以回答你的问题。

'

'

谢谢，明白了。这次恐怕就不能去北京考试了，希望下次在上海考试的时候参加。

'
那你的准备时间就更充足了。

英                     盲

谷歌在线自动翻译！

好長

想起老師說滴考試5w 1h