Ham Radio Technician Class Practice Test

These questions are part of the practice quiz. Start practicing

• How do you select a specific IRLP node when using a portable transceiver?
• What does the gain of an antenna refer to?
• What is the most common cause for failure of coaxial cables?
• What is a "parity" bit?
• What is the symbol for inductance?
• What is the effect of capacitance in an AC circuit?
• What aspect of a transmitter does the duty cycle not account for?
• Which of the following electronic components can amplify signals?
• What do the symbols on an electrical circuit schematic diagram represent?
• What is a disadvantage of "air core" coaxial cable compared to foam or solid dielectric types?
• Which of the following types of communications are permitted in the Amateur Radio Service?
• Which component is primarily used in the conversion of AC to DC?
• What is the advantage of having multiple receive bandwidth choices on a multimode transceiver?
• What type of filter should be connected to a TV receiver to prevent RF overload from a nearby 2 meter transmitter?
• What can happen if the antennas at both ends of a VHF or UHF line of sight radio link are not using the same polarization?
• What code is used when sending CW in the amateur bands?
• What can happen if a lead-acid storage battery is charged or discharged too quickly?
• What is required for an operator to legally transmit using an amateur radio station?
• Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency?
• Which device converts direct current to alternating current?
• What is component 8 in figure T2?
• Which of the following is an example of a digital communications method?
• What is a good reason not to use a "rubber duck" antenna inside your car?
• Which 70 cm frequency is authorized to a Technician Class license holder operating in ITU Region 2?
• Which of the following is equivalent to 500 milliwatts?
• What is the role of a diode in an electronic circuit?
• What is a primary reason for the FCC to regulate amateur radio communication?
• Which organization is responsible for the regulation of amateur radio operators in the United States?
• What is the only time an amateur station is authorized to transmit music?
• Who selects a Frequency Coordinator?
• What kind of wave is used for broadcasting purposes?
• What is component 4 in figure T1?
• To which foreign stations do the FCC rules authorize the transmission of non-emergency third party communications?
• What is the name for a current that flows only in one direction?
• What is one common method for reducing RF exposure levels?
• Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?
• What can you do if you are told your FM handheld or mobile transceiver is over deviating?
• When using tactical identifiers, how often must your station transmit the station's FCC-assigned call sign?
• What is the meaning of the term broadcasting in the FCC rules for the amateur services?
• Which of the following is true when making a test transmission?
• What is a common material used for coaxial cable insulators?
• Which device can be used to enter the operating frequency on a modern transceiver?
• Which of the following entities recommends transmit/receive channels and other parameters for auxiliary and repeater stations?
• What type of electrical component consists of two or more conductive surfaces separated by an insulator?
• Which of the following methods is encouraged by the FCC when identifying your station when using phone?
• What is connected to the green wire in a three-wire electrical AC plug?
• What name is given to an amateur radio station that is used to connect other amateur stations to the Internet?
• When may an amateur station use any means of radio communications at its disposal for essential communications related to the safety of human life and protection of property?
• What is the term used to describe the use of a sub-audible tone transmitted with normal voice audio to open the squelch of a receiver?
• Which of the following is commonly used as a visual indicator?
• What is component 6 in figure T2?
• What is the approximate amount of change, measured in decibels (dB), of a power increase from 5 watts to 10 watts?
• Why is it important to minimize losses in a feedline?
• Why is coaxial cable preferred for amateur radio antenna systems?
• What may result when correspondence from the FCC is returned as undeliverable because the grantee failed to provide the correct mailing address?
• Which semiconductor component has an emitter electrode?
• When must an amateur station have a control operator?
• Which device converts a low-powered 28 MHz SSB exciter to a 222 MHz output signal?
• What is a way to enable quick access to a favorite frequency on your transceiver?
• Why is having a low SWR important in a coaxial cable feedline?
• What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
• For what purpose is a temporary "1 by 1" format (letter-number-letter) call sign assigned?
• Which of the following types of transmissions are prohibited?
• Which of the following is a valid US amateur radio station call sign?
• North American amateur stations are located in which ITU region?
• What type of circuit has only one path for electricity to flow?
• What government agency regulates amateur radio operations in the United States?
• What is the name of a device that combines several semiconductors and other components into one package?
• What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
• Which instrument is used to measure electric potential or electromotive force?
• What is the name for standardized representations of components in an electrical wiring diagram?
• What is the purpose of a directional wattmeter?
• Which of the following actions might amateur operators take to prevent exposure to RF radiation in excess of FCC-supplied limits?
• What is component 9 in figure T2?
• What band is best suited to communicating via meteor scatter?
• In which component is the base terminal found?
• What is the ability to store energy in a magnetic field called?
• What electrical component is used to protect other circuit components from current overloads?
• What can be used to reduce RF current flowing on the shield of an audio cable?
• What is the unit of frequency?
• What could be used in place of a regular speaker to help you copy signals in a noisy area?
• Which of the following is a common issue when using a highly directional antenna?
• In what scenario is it permissible for amateur operators to send codes or ciphers?
• How is a semiconductor diode's cathode lead usually identified?
• How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?
• Which of the following stations transmits signals over the air from a remote receive site to a repeater for retransmission?
• What is generally the best time for long-distance 10 meter band propagation?
• What is the approximate length, in inches, of a 6 meter 1/2-wavelength wire dipole antenna?
• What can be used to determine the time period during which an amateur satellite or space station can be accessed?
• Which of the following is a form of amplitude modulation?
• What is an appropriate way to call another station on a repeater if you know the other station's call sign?
• What is the function of block 1 in a simple CW transmitter circuit?
• When is the transmission of codes or ciphers allowed to hide the meaning of a message transmitted by an amateur station?
• What method of call sign identification is required for a station transmitting phone signals?
• What is the approximate bandwidth of a VHF repeater FM phone signal?
• Which of the following formats of a self-assigned indicator is acceptable when identifying using a phone transmission?
• What is a good precaution to observe before climbing an antenna tower?
• What is the primary purpose of a capacitor in a circuit?
• Which type of circuit is characterized by components connected end-to-end?
• When must the station licensee make the station and its records available for FCC inspection?
• When may the control operator of an amateur station receive compensation for operating the station?
• What is the purpose of a fuse in an electrical circuit?
• What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
• What is the "Q" signal used to indicate that you are changing frequency?
• What determines the amount of deviation of an FM signal?
• Which of the following can be used to display signal strength on a numeric scale?
• What is probably happening when an ohmmeter, connected across a circuit, initially indicates a low resistance and then shows increasing resistance with time?
• Which of the following can be used to transmit CW in the amateur bands?
• What class of electronic components is capable of using a voltage or current signal to control current flow?
• What is meant by the statement that a satellite is operating in "mode U/V"?
• What is the FCC Part 97 definition of an amateur station?
• Which amateur band are you using when your station is transmitting on 146.52 MHz?
• What reading on an SWR meter indicates a perfect impedance match between the antenna and the feedline?
• Which component would you typically use to convert a radio frequency signal into a usable electrical signal?
• What is the national calling frequency for FM simplex operations in the 70 cm band?
• What is the maximum permissible bandwidth for a single sideband emission on the 2 meter band?
• What is a logical first step when attempting to cure a radio frequency interference problem in a nearby telephone?
• What is the function of block 2 in a transceiver with designated transmitter and receiver portions?
• What causes "tropospheric ducting"?
• What is the term that describes a transistor's ability to amplify a signal?
• What are the names of the two electrodes of a diode?
• Which type of diode allows current to flow in only one direction?
• When may a Technician Class licensee be the control operator of a station operating in an exclusive Extra Class operator segment of the amateur bands?
• If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show?
• What is component 3 in figure T1?
• What is the function of an SWR meter?
• Which of the following can be done using an amateur radio satellite?
• What must you do if you are operating on the 23 cm band and learn that you are interfering with a radiolocation station outside the United States?
• Which type of feedline has the lowest loss at VHF and UHF frequencies?
• What is one effect of high duty cycles on RF radiation exposure?
• Which of the following is an important safety precaution to observe when putting up an antenna tower?
• What is the typical effect of increasing the height of an antenna?
• What happens when the deviation of an FM transmitter is increased?
• How is an ammeter typically connected to a circuit?
• Which of the following types of emission has the narrowest bandwidth?
• What could happen if a person accidentally touched your antenna while you were transmitting?
• What formula is used to calculate voltage in a circuit?
• What is the "Q" signal used to indicate that you are receiving interference from other stations?
• What is the name for the flow of electrons in an electric circuit?
• What is one benefit of using a directional antenna?
• What is the function of a component that controls the flow of current?
• Which of the following statements about RF exposure is true?
• Which of the following antenna types is most commonly used by amateur radio operators for HF operations?
• Which of these items would be useful for a hidden transmitter hunt?
• In which direction is the radiation strongest from a half-wave dipole antenna in free space?
• How much voltage does a mobile transceiver usually require?
• What mode is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?
• What brief statement is often used in place of "CQ" to indicate that you are listening on a repeater?
• What is the purpose of a potentiometer in an electrical circuit?
• What is component 4 in figure T3?
• Which connector is suitable for frequencies above 400 MHz?
• What frequency band is primarily used for local communication by amateur operators in emergencies?
• Which common VHF/UHF connector is known for its robust design and is frequently used in amateur radio?
• What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band?
• On which of the following occasions may an FCC-licensed amateur station exchange messages with a U.S. military station?
• How many persons are required to be members of a club for a club station license to be issued by the FCC?
• Which 23 cm frequency is authorized to a Technician Class operator license?
• How is the computer's sound card utilized in digital communications?
• With which countries are FCC-licensed amateur stations prohibited from exchanging communications?
• What is the maximum power allowed when transmitting telecommand signals to radio controlled models?
• How many volts are equal to one kilovolt?
• What is the radio horizon?
• Which of the following is used together with an inductor to make a tuned circuit?
• Which of the following is accurately represented in electrical circuit schematic diagrams?
• What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?
• Which device is most effective for VHF weak-signal communication?
• What is a disadvantage of the "rubber duck" antenna supplied with most handheld radio transceivers?
• Which of the following describes the common meaning of the term "repeater offset"?
• What is the basic unit of capacitance?
• What should you do first if someone tells you that your station's transmissions are interfering with their radio or TV reception?
• Which of the following describes the muting of receiver audio controlled solely by the presence or absence of an RF signal?
• Under which of the following types of control is it permissible for the control operator to be at a location other than the control point?
• What is considered to be a proper grounding method for a tower?
• Which of the following describes a simple dipole mounted so the conductor is parallel to the Earth's surface?
• What type of transmission is indicated by the term NTSC?
• Which of the following restrictions apply when appending a self-assigned call sign indicator?
• What is component 3 in figure T3?
• What does the term "RIT" mean?
• Electrical power is measured in which of the following units?
• What is the primary consideration for a Technician Class operator when using frequency modulation?
• What type of modulation is most commonly used for VHF packet radio transmissions?
• Which entities are allowed to issue amateur licenses inside the U.S.?
• What should you do to minimize disruptions to an emergency traffic net once you have checked in?
• What electrical difference exists between the smaller RG-58 and larger RG-8 coaxial cables?
• Which of the following is an acceptable language for use for station identification when operating in a phone sub-band?
• If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz?
• In which mode are Technician Class operators allowed to operate on the 10 meter band?
• What type of communications are FCC-licensed amateur stations prohibited from engaging in?
• What is the preamble in a formal traffic message?
• Which of the following best describes the term “repeater” in amateur radio?
• Which of the following is an acceptable method to determine that your station complies with FCC RF exposure regulations?
• What is the function of a product detector?
• Who may be the control operator of a station communicating through an amateur satellite or space station?
• Which component is used to measure electrical current?
• Who is eligible to be the control operator of an amateur station?
• What is the name for a current that reverses direction on a regular basis?
• What type of antennas are the quad, Yagi, and dish?
• When the control operator is not the station licensee, who is responsible for the proper operation of the station?
• What, in general terms, is standing wave ratio (SWR)?
• What circuit is indicated if a frequency discriminator is involved?
• Which of the following would reduce ignition interference to a receiver?
• What types of international communications are permitted by an FCC-licensed amateur station?
• What does the term "impedance" refer to in an electrical circuit?
• What is the FCC Part 97 definition of telecommand?
• How much transmitter power should be used on the uplink frequency of an amateur satellite or space station?
• What determines the transmitting privileges of an amateur station?
• What type of receiver is depicted in a typical example?
• What is the primary purpose of a matching network in an antenna system?
• If your license has expired and is still within the allowable grace period, may you continue to operate a transmitter on amateur service frequencies?
• What increases the low-power output from a handheld transceiver?
• Which of the following emission modes may be used by a Technician Class operator between 219 and 220 MHz?
• What kind of component is typically used to block DC while allowing AC signals to pass?
• What type of amateur station simultaneously retransmits the signal of another amateur station on a different channel or channels?
• Which instrument can be used to determine if a feedline and antenna are properly matched?
• Which of the following types of solder is best for radio and electronic use?
• Which type of modulation is most commonly used for VHF and UHF voice repeaters?
• Which of the following is a common use of coaxial cable?
• Which instrument measures electric current?
• What is the most likely cause of interference to a non-cordless telephone from a nearby transmitter?
• Why do VHF and UHF radio signals usually travel somewhat farther than the visual line of sight distance between two stations?
• What do the FCC rules mean when an amateur frequency band is said to be available on a secondary basis?
• What is the approximate bandwidth of a single sideband voice signal?
• What does the abbreviation PSK mean?
• What causes "spin fading" when referring to satellite signals?
• What might be the problem if you receive a report that your audio signal through the repeater is distorted or unintelligible?
• Which of the following is good practice when installing ground wires on a tower for lightning protection?
• What is the approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?
• What best describes a relay?
• Which device or circuit changes an alternating current into a varying direct current signal?
• What should you transmit when responding to a call of CQ?
• Why should you avoid attaching an antenna to a utility pole?
• What is the ability to store energy in an electric field called?
• Which of the following would be a reason to use a balun in an antenna system?
• Which frequency is within the 6 meter band?
• What is component 2 in figure T1?
• How many microfarads are 1,000,000 picofarads?
• Which component is primarily responsible for controlling the flow of current in a circuit?
• Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications?
• What is the most common repeater frequency offset in the 2 meter band?
• What is required for an amateur station to operate in a foreign country?
• What is the abbreviation that refers to radio frequency signals of all types?
• What is the approximate SWR value above which the protection circuits in most solid-state transmitters begin to reduce transmitter power?
• Why should you not set your transmit frequency to be exactly at the edge of an amateur band or sub-band?
• Who is accountable should a repeater inadvertently retransmit communications that violate the FCC rules?
• What is the maximum power level that an amateur radio station may use at VHF frequencies before an RF exposure evaluation is required?
• Which of the following meets the FCC definition of harmful interference?
• Which amateur stations may make contact with an amateur station on the International Space Station using 2 meter and 70 cm band amateur radio frequencies?
• What type of device is commonly used to increase signal strength in a radio?
• What is the impedance of the most commonly used coaxial cable in amateur radio?
• Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?
• What would happen if a series circuit includes a break?
• When is an amateur station required to transmit its assigned call sign?
• Which circuit is responsible for combining a speech signal and an RF carrier?
• How soon may you operate a transmitter on an amateur service frequency after you pass the examination required for your first amateur radio license?
• How often should an amateur operator evaluate their station for RF safety compliance?
• What is required in place of on-air station identification when sending signals to a radio control model using amateur frequencies?
• What type of communication is allowed during a gavel-to-gavel proceeding at an amateur convention?
• What is the approximate maximum bandwidth required to transmit a CW signal?
• What is a common source of high-pitched whine that varies with engine speed in a mobile transceiver's audio?
• What does the term "bandwidth" refer to in radio communications?
• Where should a mobile transceiver's power negative connection be made?
• Which of the following measurements are commonly made using a multimeter?
• What is a symptom of RF feedback in a transmitter or transceiver?
• What electrical component is used to oppose the flow of current in a DC circuit?
• What is the current flowing through a 24-ohm resistor connected across 240 volts?
• What do the initials LEO tell you about an amateur satellite?
• Which of the following is normally used when sending automatic location reports via amateur radio?
• Which of the following may be included in packet transmissions?
• Which is a commonly accepted value for the lowest voltage that can cause a dangerous electric shock?
• Which statement is true regarding PL-259 type coax connectors?
• What happens to power lost in a feedline?
• What is usually considered to be the most important job of an amateur operator when handling emergency traffic messages?
• What factors affect the RF exposure of people near an amateur station antenna?
• Which of these components is made of three layers of semiconductor material?
• What is another way to specify a radio signal frequency of 1,500,000 hertz?
• What does the acronym "BER" mean when applied to digital communications systems?
• Which band is designated for use by Technician Class operators operating on 70 cm?
• What could be happening if another operator reports a variable high-pitched whine on the audio from your mobile transmitter?
• With regard to satellite communications, what is Doppler shift?
• What amateur band are you using if you are transmitting on 223.50 MHz?
• What is a grid locator?
• Which of the following may be a cause of radio frequency interference?
• Why should coax connectors exposed to the weather be sealed against water intrusion?
• What is a commonly used method of sending signals to and from a digital satellite?
• Which of the following is true concerning the microphone connectors on amateur transceivers?
• What type of radiation are VHF and UHF radio signals?
• When is an amateur station authorized to automatically retransmit the radio signals of other amateur stations?
• What is the purpose of a mixer in a superheterodyne receiver?
• What does the abbreviation "LED" stand for?
• How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?
• What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
• Who must designate the station control operator?
• What is meant by fundamental overload in reference to a receiver?
• What is the typical maximum power output for Technician Class operators in the HF bands?
• What is the formula used to calculate electrical power in a DC circuit?
• What set of rules applies to proper operation of your station when using amateur radio at the request of public service officials?
• What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?
• Which of the bands available to Technician Class operators have mode-restricted sub-bands?
• Which of the following is an appropriate receive filter to select in order to minimize noise and interference for SSB reception?
• What is a satellite beacon?
• Which of the following may be useful in correcting a radio frequency interference problem?
• Which type of call sign has a single letter in both the prefix and suffix?
• Electrical current is measured in which of the following units?
• What are the FCC rules regarding power levels used in the amateur bands?
• What electrical component stores energy in an electric field?
• What antenna polarization is often used for long-distance weak-signal CW and SSB contacts using the VHF and UHF bands?
• What is the nominal voltage of a fully charged nickel-cadmium cell?
• Which semiconductor component has a gate electrode?
• What might cause erratic changes in SWR readings?
• What is the primary function of an antenna tuner?
• What electronic component allows current to flow in only one direction?
• What does the term APRS mean?
• When should members of a tower work team wear a hard hat and safety glasses?
• What is the maximum amount of current a circuit can safely handle, measured in amperes?
• What is the current flowing through a 100-ohm resistor connected across 200 volts?
• Where must a filter be installed to reduce harmonic emissions?
• What is a usual name for electromagnetic waves that travel through space?
• What is the meaning of the procedural signal "CQ"?
• What is the function of a capacitor in an electronic circuit?
• What type of wave carries radio signals between transmitting and receiving stations?
• What is the primary purpose of a dummy load?
• What is the characteristic appearance of a "cold" solder joint?
• What is the standard frequency separation between VHF FM channels?
• What is the grace period following the expiration of an amateur license within which the license may be renewed?
• What type of control is being used for a repeater when the control operator is not present at a control point?
• Which component is primarily used to store energy in a magnetic field?
• Which of the following can result from poor matching between a feedline and an antenna?
• What is component 1 in figure T1?
• Where is an RF preamplifier installed?
• What emission modes are permitted in the mode-restricted sub-bands at 50.0 to 50.1 MHz and 144.0 to 144.1 MHz?
• What is the ITU?
• What is the Radio Amateur Civil Emergency Service?
• How would you change a dipole antenna to make it resonant on a higher frequency?
• Which type of voice modulation is most often used for long-distance or weak signal contacts on the VHF and UHF bands?
• What is a beam antenna?
• What type of identification is being used when identifying a station on the air as "Race Headquarters"?
• What is the normal term for an FCC-issued primary station/operator license grant?
• What component is commonly used to change 120V AC house current to a lower AC voltage for other uses?
• What is the basic unit of inductance?
• What electrical component is usually composed of a coil of wire?
• What is the purpose of the squelch control on a transceiver?
• What should you do if a "Part 15" device in your neighbor's home is causing harmful interference to your amateur station?
• What term describes the rapid fluttering sound sometimes heard from mobile stations that are moving while transmitting?
• What does a high SWR reading typically indicate?
• Which battery type is not rechargeable?
• What is the primary purpose of amateur stations according to the FCC?
• Which band has the designation for VHF communication?
• When may amateur radio operators use their stations to notify other amateurs of the availability of equipment for sale or trade?
• How might you obtain a list of active nodes that use VoIP?
• What can be said about the controls provided by the FCC?
• What is the purpose of a noise blanker in a receiver?
• What type of circuit controls the amount of voltage from a power supply?
• Which of the following is common practice during net operations to get the immediate attention of the net control station when reporting an emergency?
• What is component 4 in figure T2?
• What electrical component is used to connect or disconnect electrical circuits?
• What instrument is used to measure resistance?
• Which of the following controls could be used if the voice pitch of a single-sideband signal seems too high or low?
• What is one way to recharge a 12-volt lead-acid station battery if the commercial power is out?
• Which of the following is good procedure when contacting another station in a radio contest?
• What is the correct way to connect a voltmeter to a circuit?
• Which of the following establishes grounding requirements for an amateur radio tower or antenna?
• What does an SWR reading of 4:1 indicate?
• When are you allowed to operate your amateur station in a foreign country?
• What is the term used to describe an amateur station that is transmitting and receiving on the same frequency?
• Which term describes the rate at which electrical energy is used?
• What is a band plan, beyond the privileges established by the FCC?
• What formula is used to calculate current in a circuit?
• Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feedline?
• Which device is used to measure electrical current?
• Which mode of operation would allows for time-shared use of a frequency?
• How does current flowing through the body cause a health hazard?
• From which of the following may an FCC-licensed amateur station transmit, in addition to places where the FCC regulates communications?
• How many volts are equal to one microvolt?
• Why should the outer jacket of coaxial cable be resistant to ultraviolet light?
• Which of the following is a good electrical conductor?
• What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
• What type of switch is represented by item 3?
• Which of the following circuits demodulates FM signals?
• What is the unit of electrical resistance?
• What is the main purpose of an antenna tuner?
• Which type of conductor is best for RF grounding?
• What is PSK31?
• Which of the following common problems might cause you to be able to hear but not access a repeater even when transmitting with the proper offset?
• What is the purpose of a gin pole?
• What does the term "check" refer to in a formal traffic message?
• What kind of hazard is presented by a conventional 12-volt storage battery?
• What generally happens as the frequency of a signal passing through coaxial cable is increased?
• Which of the following frequencies has the lowest Maximum Permissible Exposure limit?
• What unit is used to measure electrical resistance?
• What may happen if a transmitter is operated with the microphone gain set too high?
• Why do exposure limits vary with frequency?
• Which device would be connected between a transceiver and computer in a packet radio station?
• How many milliamperes is 1.5 amperes?
• What popular operating activity involves contacting as many stations as possible during a specified period of time?
• Which of the following is a good electrical insulator?
• Which of these components can be used as an electronic switch or amplifier?
• Which part of the FCC rules contains the rules and regulations governing the Amateur Radio Service?
• Which term describes the ability of a receiver to discriminate between multiple signals?
• What type of component is often used as an adjustable volume control?
• What type of electrical component stores energy in a magnetic field?
• What electrical parameter is controlled by a potentiometer?
• What safety equipment should always be included in home-built equipment that is powered from 120V AC power circuits?
• Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?
• Which of the following methods is used to locate sources of noise interference or jamming?
• What is the FCC Part 97 definition of telemetry?
• Why are UHF signals often more effective from inside buildings than VHF signals?
• What should you do if another operator reports that your station's 2 meter signals were strong just a moment ago but are now weak or distorted?
• How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?
• What must an amateur operator do when making on-air transmissions to test equipment or antennas?
• What kind of hazard might exist in a power supply when it is turned off and disconnected?
• What agency regulates and enforces the rules for the Amateur Radio Service in the United States?
• What does the abbreviation "FET" stand for?
• What is the electrical term for the electromotive force (EMF) that causes electron flow?
• Under which of the following circumstances are amateur stations authorized to transmit signals related to broadcasting, program production, or news gathering, assuming no other means is available?
• When using a directional antenna, how can you access a distant repeater if buildings or obstructions block the direct line of sight path?
• Which of the following might damage a multimeter?
• What is the basic unit of electromotive force?
• What type of control is being used when transmitting using a handheld radio?
• Under what circumstances is it safe to climb a tower without a helper or observer?
• Which of the following is an important safety rule to remember when using a crank-up tower?
• What is the proper course of action if your station's transmission unintentionally interferes with another station?
• What is one required condition for amateur radio operation during emergencies?
• What type of control is used when the control operator is not at the station location but can indirectly manipulate the operating adjustments of a station?
• Which is a good reason to use a regulated power supply for communications equipment?
• Which of the following is true regarding vertical antennas?
• What is a good way to guard against electrical shock at your station?
• What is an amateur station control point?
• What is the approximate length, in inches, of a quarter-wavelength vertical antenna for 146 MHz?
• What is a common repeater frequency offset in the 70 cm band?
• Who does the FCC presume to be the control operator of an amateur station, unless documentation to the contrary is in the station records?
• Which of the following is true concerning grounding conductors used for lightning protection?
• What is meant by "duty cycle" when referring to RF exposure?
• How can you make sure your station stays in compliance with RF safety regulations?
• What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?
• What formula is used to calculate resistance in a circuit?
• What is the primary advantage of single sideband over FM for voice transmissions?
• What is the FCC Part 97 definition of a space station?
• Which of the following is an appropriate receive filter to select in order to minimize noise and interference for CW reception?
• What do RACES and ARES have in common?
• What should you do if you receive a report that your station's transmissions are causing splatter or interference on nearby frequencies?