SUBELEMENT T7 [4 Exam Questions - 4 Groups] Station equipment, common transmitter and receiver problems, antenna measurements and troubleshooting, basic.

SUBELEMENT T7SUBELEMENT T7[4 Exam Questions - 4 Groups][4 Exam Questions - 4 Groups]

Station equipment, common transmitter and receiver problems, antenna measurements and troubleshooting, basic repair and testing.

2Microhams 2010 Technician

T7 – Station Equipment and T7 – Station Equipment and TroubleshootingTroubleshooting

T7A –T7A – Station radios; receivers, transmitters, Station radios; receivers, transmitters, transceiverstransceivers

T7B –T7B – Common transmitter and receiver problems; Common transmitter and receiver problems; symptoms of overload and overdrive, distortion, symptoms of overload and overdrive, distortion, interference, over and under modulation, RF feedback, interference, over and under modulation, RF feedback, off frequency signals; fading and noise; problems with off frequency signals; fading and noise; problems with digital communications interfacesdigital communications interfaces

T7C –T7C – Antenna measurements and troubleshooting; Antenna measurements and troubleshooting; measuring SWR, dummy loads, feed line failure modesmeasuring SWR, dummy loads, feed line failure modes

T7D –T7D – Basic repair and testing; soldering, use of a Basic repair and testing; soldering, use of a voltmeter, ammeter, and ohmmetervoltmeter, ammeter, and ohmmeter

T7A01 What is the function of a product T7A01 What is the function of a product detector?detector?

A.A. Detect phase modulated signalsDetect phase modulated signals

B.B. Demodulate FM signalsDemodulate FM signals

C.C. Detect CW and SSB signalsDetect CW and SSB signals

D.D. Combine speech and RF signalsCombine speech and RF signals

T7A01 What is the function of a product T7A01 What is the function of a product detector?detector?

A.A. Detect phase modulated signalsDetect phase modulated signals

B.B. Demodulate FM signalsDemodulate FM signals

C.C. Detect CW and SSB signalsDetect CW and SSB signalsD.D. Combine speech and RF signalsCombine speech and RF signals

T7A02 What type of receiver is shown in T7A02 What type of receiver is shown in Figure T6?Figure T6?

A.A. Direct conversionDirect conversion

B.B. Super-regenerativeSuper-regenerative

C.C. Single-conversion superheterodyneSingle-conversion superheterodyne

D.D. Dual-conversion superheterodyneDual-conversion superheterodyne

T7A02 What type of receiver is shown in T7A02 What type of receiver is shown in Figure T6?Figure T6?

A.A. Direct conversionDirect conversion

B.B. Super-regenerativeSuper-regenerative

C.C. Single-conversion superheterodyneSingle-conversion superheterodyneD.D. Dual-conversion superheterodyneDual-conversion superheterodyne

T7A03 What is the function of a mixer in a T7A03 What is the function of a mixer in a superheterodyne receiver?superheterodyne receiver?

A.A. To reject signals outside of the desired passbandTo reject signals outside of the desired passband

B.B. To combine signals from several stations togetherTo combine signals from several stations together

C.C. To shift the incoming signal to an intermediate To shift the incoming signal to an intermediate frequencyfrequency

D.D. To connect the receiver with an auxiliary device, To connect the receiver with an auxiliary device, such as a TNCsuch as a TNC

T7A03 What is the function of a mixer in a T7A03 What is the function of a mixer in a superheterodyne receiver?superheterodyne receiver?

A.A. To reject signals outside of the desired passbandTo reject signals outside of the desired passband

B.B. To combine signals from several stations togetherTo combine signals from several stations together

C.C. To shift the incoming signal to an To shift the incoming signal to an intermediate frequencyintermediate frequencyD.D. To connect the receiver with an auxiliary device, To connect the receiver with an auxiliary device,

such as a TNCsuch as a TNC

T7A04 What circuit is pictured in Figure T7A04 What circuit is pictured in Figure T7, if block 1 is a frequency discriminator?T7, if block 1 is a frequency discriminator?

A.A. A double-conversion receiverA double-conversion receiver

B.B. A regenerative receiverA regenerative receiver

C.C. A superheterodyne receiverA superheterodyne receiver

D.D. An FM receiverAn FM receiver

T7A04 What circuit is pictured in Figure T7, if T7A04 What circuit is pictured in Figure T7, if block 1 is a frequency discriminator?block 1 is a frequency discriminator?

A.A. A double-conversion receiverA double-conversion receiver

B.B. A regenerative receiverA regenerative receiver

C.C. A superheterodyne receiverA superheterodyne receiver

D.D. An FM receiverAn FM receiver

T7A05 What is the function of block 1 if T7A05 What is the function of block 1 if figure T4 is a simple CW transmitter?figure T4 is a simple CW transmitter?

A.A. Reactance modulatorReactance modulator

B.B. Product detectorProduct detector

C.C. Low-pass filterLow-pass filter

D.D. OscillatorOscillator

T7A05 What is the function of block 1 if figure T7A05 What is the function of block 1 if figure T4 is a simple CW transmitter?T4 is a simple CW transmitter?

A.A. Reactance modulatorReactance modulator

B.B. Product detectorProduct detector

C.C. Low-pass filterLow-pass filter

D.D. OscillatorOscillator

T7A06 What device takes the output of a T7A06 What device takes the output of a low-powered 28 MHz SSB exciter and low-powered 28 MHz SSB exciter and produces a 222 MHz output signal?produces a 222 MHz output signal?

A.A. High-pass filterHigh-pass filter

B.B. Low-pass filterLow-pass filter

C.C. TransverterTransverter

D.D. Phase converterPhase converter

T7A06 What device takes the output of a low-T7A06 What device takes the output of a low-powered 28 MHz SSB exciter and produces a powered 28 MHz SSB exciter and produces a 222 MHz output signal?222 MHz output signal?

A.A. High-pass filterHigh-pass filter

B.B. Low-pass filterLow-pass filter

C.C. TransverterTransverterD.D. Phase converterPhase converter

T7A07 If figure T5 represents a transceiver T7A07 If figure T5 represents a transceiver in which block 1 is the transmitter portion in which block 1 is the transmitter portion and block 3 is the receiver portion, what is and block 3 is the receiver portion, what is the function of block 2?the function of block 2?

A.A. A balanced modulatorA balanced modulator

B.B. A transmit-receive switchA transmit-receive switch

C.C. A power amplifierA power amplifier

D.D. A high-pass filterA high-pass filter

T7A07 If figure T5 represents a transceiver in T7A07 If figure T5 represents a transceiver in which block 1 is the transmitter portion and which block 1 is the transmitter portion and block 3 is the receiver portion, what is the block 3 is the receiver portion, what is the function of block 2?function of block 2?

A.A. A balanced modulatorA balanced modulator

B.B. A transmit-receive switchA transmit-receive switchC.C. A power amplifierA power amplifier

D.D. A high-pass filterA high-pass filter

T7A08 Which of the following circuits T7A08 Which of the following circuits combines a speech signal and an RF combines a speech signal and an RF carrier?carrier?

A.A. Beat frequency oscillatorBeat frequency oscillator

B.B. DiscriminatorDiscriminator

C.C. ModulatorModulator

D.D. Noise blankerNoise blanker

T7A08 Which of the following circuits T7A08 Which of the following circuits combines a speech signal and an RF carrier?combines a speech signal and an RF carrier?

A.A. Beat frequency oscillatorBeat frequency oscillator

B.B. DiscriminatorDiscriminator

C.C. ModulatorModulatorD.D. Noise blankerNoise blanker

T7A09 Which of the following devices is T7A09 Which of the following devices is most useful for VHF weak-signal most useful for VHF weak-signal communication?communication?

A.A. A quarter-wave vertical antennaA quarter-wave vertical antenna

B.B. A multi-mode VHF transceiverA multi-mode VHF transceiver

C.C. An omni-directional antennaAn omni-directional antenna

D.D. A mobile VHF FM transceiverA mobile VHF FM transceiver

T7A09 Which of the following devices is most T7A09 Which of the following devices is most useful for VHF weak-signal communication?useful for VHF weak-signal communication?

A.A. A quarter-wave vertical antennaA quarter-wave vertical antenna

B.B. A multi-mode VHF transceiverA multi-mode VHF transceiverC.C. An omni-directional antennaAn omni-directional antenna

D.D. A mobile VHF FM transceiverA mobile VHF FM transceiver

T7A10 What device increases the low-T7A10 What device increases the low-power output from a handheld power output from a handheld transceiver?transceiver?

A.A. A voltage dividerA voltage divider

B.B. An RF power amplifierAn RF power amplifier

C.C. An impedance networkAn impedance network

D.D. A voltage regulatorA voltage regulator

T7A10 What device increases the low-power T7A10 What device increases the low-power output from a handheld transceiver?output from a handheld transceiver?

A.A. A voltage dividerA voltage divider

B.B. An RF power amplifierAn RF power amplifierC.C. An impedance networkAn impedance network

D.D. A voltage regulatorA voltage regulator

T7A11 Which of the following circuits T7A11 Which of the following circuits demodulates FM signals?demodulates FM signals?

A.A. LimiterLimiter

B.B. DiscriminatorDiscriminator

C.C. Product detectorProduct detector

D.D. Phase inverterPhase inverter

T7A11 Which of the following circuits T7A11 Which of the following circuits demodulates FM signals?demodulates FM signals?

A.A. LimiterLimiter

B.B. DiscriminatorDiscriminatorC.C. Product detectorProduct detector

D.D. Phase inverterPhase inverter

T7A12 Which term describes the ability of T7A12 Which term describes the ability of a receiver to discriminate between multiple a receiver to discriminate between multiple signals?signals?

A.A. Tuning rateTuning rate

B.B. SensitivitySensitivity

C.C. SelectivitySelectivity

D.D. Noise floorNoise floor

T7A12 Which term describes the ability of a T7A12 Which term describes the ability of a receiver to discriminate between multiple receiver to discriminate between multiple signals?signals?

A.A. Tuning rateTuning rate

B.B. SensitivitySensitivity

C.C. SelectivitySelectivityD.D. Noise floorNoise floor

T7A13 Where is an RF preamplifier T7A13 Where is an RF preamplifier installed?installed?

A.A. Between the antenna and receiverBetween the antenna and receiver

B.B. At the output of the transmitter's power amplifierAt the output of the transmitter's power amplifier

C.C. Between a transmitter and antenna tunerBetween a transmitter and antenna tuner

D.D. At the receiver's audio outputAt the receiver's audio output

T7A13 Where is an RF preamplifier installed?T7A13 Where is an RF preamplifier installed?

A.A. Between the antenna and receiverBetween the antenna and receiverB.B. At the output of the transmitter's power amplifierAt the output of the transmitter's power amplifier

C.C. Between a transmitter and antenna tunerBetween a transmitter and antenna tuner

D.D. At the receiver's audio outputAt the receiver's audio output

T7B01 What can you do if you are told T7B01 What can you do if you are told your FM handheld or mobile transceiver is your FM handheld or mobile transceiver is over deviating?over deviating?

A.A. Talk louder into the microphoneTalk louder into the microphone

B.B. Let the transceiver cool offLet the transceiver cool off

C.C. Change to a higher power levelChange to a higher power level

D.D. Talk farther away from the microphoneTalk farther away from the microphone

T7B01 What can you do if you are told your T7B01 What can you do if you are told your FM handheld or mobile transceiver is over FM handheld or mobile transceiver is over deviating?deviating?

A.A. Talk louder into the microphoneTalk louder into the microphone

B.B. Let the transceiver cool offLet the transceiver cool off

C.C. Change to a higher power levelChange to a higher power level

D.D. Talk farther away from the microphoneTalk farther away from the microphone

T7B02 What is meant by fundamental T7B02 What is meant by fundamental overload in reference to a receiver?overload in reference to a receiver?

A.A. Too much voltage from the power supplyToo much voltage from the power supply

B.B. Too much current from the power supplyToo much current from the power supply

C.C. Interference caused by very strong signalsInterference caused by very strong signals

D.D. Interference caused by turning the volume up too Interference caused by turning the volume up too highhigh

T7B02 What is meant by fundamental T7B02 What is meant by fundamental overload in reference to a receiver?overload in reference to a receiver?

A.A. Too much voltage from the power supplyToo much voltage from the power supply

B.B. Too much current from the power supplyToo much current from the power supply

C.C. Interference caused by very strong Interference caused by very strong signalssignalsD.D. Interference caused by turning the volume up too Interference caused by turning the volume up too

highhigh

T7B03 Which of the following may be a T7B03 Which of the following may be a cause of radio frequency interference?cause of radio frequency interference?

A.A. Fundamental overloadFundamental overload

B.B. HarmonicsHarmonics

C.C. Spurious emissionsSpurious emissions

D.D. All of these choices are correctAll of these choices are correct

T7B03 Which of the following may be a cause T7B03 Which of the following may be a cause of radio frequency interference?of radio frequency interference?

A.A. Fundamental overloadFundamental overload

B.B. HarmonicsHarmonics

C.C. Spurious emissionsSpurious emissions

D.D. All of these choices are correctAll of these choices are correct

T7B04 What is the most likely cause of T7B04 What is the most likely cause of interference to a non-cordless telephone interference to a non-cordless telephone from a nearby transmitter?from a nearby transmitter?

A.A. Harmonics from the transmitterHarmonics from the transmitter

B.B. The telephone is inadvertently acting as a radio The telephone is inadvertently acting as a radio receiverreceiver

C.C. Poor station groundingPoor station grounding

D.D. Improper transmitter adjustmentImproper transmitter adjustment

T7B04 What is the most likely cause of T7B04 What is the most likely cause of interference to a non-cordless telephone from interference to a non-cordless telephone from a nearby transmitter?a nearby transmitter?

A.A. Harmonics from the transmitterHarmonics from the transmitter

B.B. The telephone is inadvertently acting as a The telephone is inadvertently acting as a radio receiverradio receiverC.C. Poor station groundingPoor station grounding

D.D. Improper transmitter adjustmentImproper transmitter adjustment

T7B05 What is a logical first step when T7B05 What is a logical first step when attempting to cure a radio frequency attempting to cure a radio frequency interference problem in a nearby interference problem in a nearby telephone?telephone?

A.A. Install a low-pass filter at the transmitterInstall a low-pass filter at the transmitter

B.B. Install a high-pass filter at the transmitterInstall a high-pass filter at the transmitter

C.C. Install an RF filter at the telephoneInstall an RF filter at the telephone

D.D. Improve station groundingImprove station grounding

T7B05 What is a logical first step when T7B05 What is a logical first step when attempting to cure a radio frequency attempting to cure a radio frequency interference problem in a nearby telephone?interference problem in a nearby telephone?

A.A. Install a low-pass filter at the transmitterInstall a low-pass filter at the transmitter

B.B. Install a high-pass filter at the transmitterInstall a high-pass filter at the transmitter

C.C. Install an RF filter at the telephoneInstall an RF filter at the telephoneD.D. Improve station groundingImprove station grounding

T7B06 What should you do first if T7B06 What should you do first if someone tells you that your station's someone tells you that your station's transmissions are interfering with their transmissions are interfering with their radio or TV reception?radio or TV reception?

A.A. Make sure that your station is functioning properly Make sure that your station is functioning properly and that it does not cause interference to your own and that it does not cause interference to your own televisiontelevision

B.B. Immediately turn off your transmitter and contact Immediately turn off your transmitter and contact the nearest FCC office for assistancethe nearest FCC office for assistance

C.C. Tell them that your license gives you the right to Tell them that your license gives you the right to transmit and nothing can be done to reduce the transmit and nothing can be done to reduce the interferenceinterference

D.D. Continue operating normally because your Continue operating normally because your equipment cannot possibly cause any interferenceequipment cannot possibly cause any interference

T7B06 What should you do first if someone T7B06 What should you do first if someone tells you that your station's transmissions are tells you that your station's transmissions are interfering with their radio or TV reception?interfering with their radio or TV reception?

A.A. Make sure that your station is functioning Make sure that your station is functioning properly and that it does not cause properly and that it does not cause interference to your own televisioninterference to your own televisionB.B. Immediately turn off your transmitter and contact Immediately turn off your transmitter and contact

the nearest FCC office for assistancethe nearest FCC office for assistance

C.C. Tell them that your license gives you the right to Tell them that your license gives you the right to transmit and nothing can be done to reduce the transmit and nothing can be done to reduce the interferenceinterference

D.D. Continue operating normally because your Continue operating normally because your equipment cannot possibly cause any interferenceequipment cannot possibly cause any interference

T7B07 Which of the following may be T7B07 Which of the following may be useful in correcting a radio frequency useful in correcting a radio frequency interference problem?interference problem?

A.A. Snap-on ferrite chokesSnap-on ferrite chokes

B.B. Low-pass and high-pass filtersLow-pass and high-pass filters

C.C. Band-reject and band-pass filtersBand-reject and band-pass filters

D.D. All of these choices are correctAll of these choices are correct

T7B07 Which of the following may be useful in T7B07 Which of the following may be useful in correcting a radio frequency interference correcting a radio frequency interference problem?problem?

A.A. Snap-on ferrite chokesSnap-on ferrite chokes

B.B. Low-pass and high-pass filtersLow-pass and high-pass filters

C.C. Band-reject and band-pass filtersBand-reject and band-pass filters

D.D. All of these choices are correctAll of these choices are correct

T7B08 What should you do if a "Part 15" T7B08 What should you do if a "Part 15" device in your neighbor's home is causing device in your neighbor's home is causing harmful interference to your amateur harmful interference to your amateur station?station?

A.A. Work with your neighbor to identify the offending Work with your neighbor to identify the offending devicedevice

B.B. Politely inform your neighbor about the rules that Politely inform your neighbor about the rules that require him to stop using the device if it causes require him to stop using the device if it causes interferenceinterference

C.C. Check your station and make sure it meets the Check your station and make sure it meets the standards of good amateur practicestandards of good amateur practice

D.D. All of these choices are correctAll of these choices are correct

T7B08 What should you do if a "Part 15" T7B08 What should you do if a "Part 15" device in your neighbor's home is causing device in your neighbor's home is causing harmful interference to your amateur station?harmful interference to your amateur station?

A.A. Work with your neighbor to identify the offending Work with your neighbor to identify the offending devicedevice

B.B. Politely inform your neighbor about the rules that Politely inform your neighbor about the rules that require him to stop using the device if it causes require him to stop using the device if it causes interferenceinterference

C.C. Check your station and make sure it meets the Check your station and make sure it meets the standards of good amateur practicestandards of good amateur practice

D.D. All of these choices are correctAll of these choices are correct

T7B09 What could be happening if another T7B09 What could be happening if another operator reports a variable high-pitched operator reports a variable high-pitched whine on the audio from your mobile whine on the audio from your mobile transmitter?transmitter?

A.A. Your microphone is picking up noise from an open Your microphone is picking up noise from an open windowwindow

B.B. You have the volume on your receiver set too highYou have the volume on your receiver set too high

C.C. You need to adjust your squelch controlYou need to adjust your squelch control

D.D. Noise on the vehicle's electrical system is being Noise on the vehicle's electrical system is being transmitted along with your speech audiotransmitted along with your speech audio

T7B09 What could be happening if another T7B09 What could be happening if another operator reports a variable high-pitched whine operator reports a variable high-pitched whine on the audio from your mobile transmitter?on the audio from your mobile transmitter?

A.A. Your microphone is picking up noise from an open Your microphone is picking up noise from an open windowwindow

B.B. You have the volume on your receiver set too highYou have the volume on your receiver set too high

C.C. You need to adjust your squelch controlYou need to adjust your squelch control

D.D. Noise on the vehicle's electrical system is Noise on the vehicle's electrical system is being transmitted along with your speech being transmitted along with your speech audioaudio

T7B10 What might be the problem if you T7B10 What might be the problem if you receive a report that your audio signal receive a report that your audio signal through the repeater is distorted or through the repeater is distorted or unintelligible?unintelligible?

A.A. Your transmitter may be slightly off frequencyYour transmitter may be slightly off frequency

B.B. Your batteries may be running lowYour batteries may be running low

C.C. You could be in a bad locationYou could be in a bad location

D.D. All of these choices are correctAll of these choices are correct

T7B10 What might be the problem if you T7B10 What might be the problem if you receive a report that your audio signal through receive a report that your audio signal through the repeater is distorted or unintelligible?the repeater is distorted or unintelligible?

A.A. Your transmitter may be slightly off frequencyYour transmitter may be slightly off frequency

B.B. Your batteries may be running lowYour batteries may be running low

C.C. You could be in a bad locationYou could be in a bad location

D.D. All of these choices are correctAll of these choices are correct

T7B11 What is a symptom of RF feedback T7B11 What is a symptom of RF feedback in a transmitter or transceiver?in a transmitter or transceiver?

A.A. Excessive SWR at the antenna connectionExcessive SWR at the antenna connection

B.B. The transmitter will not stay on the desired The transmitter will not stay on the desired frequencyfrequency

C.C. Reports of garbled, distorted, or unintelligible Reports of garbled, distorted, or unintelligible transmissionstransmissions

D.D. Frequent blowing of power supply fusesFrequent blowing of power supply fuses

T7B11 What is a symptom of RF feedback in T7B11 What is a symptom of RF feedback in a transmitter or transceiver?a transmitter or transceiver?

A.A. Excessive SWR at the antenna connectionExcessive SWR at the antenna connection

B.B. The transmitter will not stay on the desired The transmitter will not stay on the desired frequencyfrequency

C.C. Reports of garbled, distorted, or Reports of garbled, distorted, or unintelligible transmissionsunintelligible transmissionsD.D. Frequent blowing of power supply fusesFrequent blowing of power supply fuses

T7B12 What does the acronym "BER" T7B12 What does the acronym "BER" mean when applied to digital mean when applied to digital communications systems?communications systems?

A.A. Baud Enhancement RecoveryBaud Enhancement Recovery

B.B. Baud Error RemovalBaud Error Removal

C.C. Bit Error RateBit Error Rate

D.D. Bit Exponent ResourceBit Exponent Resource

T7B12 What does the acronym "BER" mean T7B12 What does the acronym "BER" mean when applied to digital communications when applied to digital communications systems?systems?

A.A. Baud Enhancement RecoveryBaud Enhancement Recovery

B.B. Baud Error RemovalBaud Error Removal

C.C. Bit Error RateBit Error RateD.D. Bit Exponent ResourceBit Exponent Resource

T7C01 What is the primary purpose of a T7C01 What is the primary purpose of a dummy load?dummy load?

A.A. To prevent the radiation of signals when making To prevent the radiation of signals when making teststests

B.B. To prevent over-modulation of your transmitterTo prevent over-modulation of your transmitter

C.C. To improve the radiation from your antennaTo improve the radiation from your antenna

D.D. To improve the signal to noise ratio of your To improve the signal to noise ratio of your receiverreceiver

T7C01 What is the primary purpose of a T7C01 What is the primary purpose of a dummy load?dummy load?

A.A. To prevent the radiation of signals when To prevent the radiation of signals when making testsmaking testsB.B. To prevent over-modulation of your transmitterTo prevent over-modulation of your transmitter

C.C. To improve the radiation from your antennaTo improve the radiation from your antenna

D.D. To improve the signal to noise ratio of your To improve the signal to noise ratio of your receiverreceiver

T7C02 Which of the following instruments T7C02 Which of the following instruments can be used to determine if an antenna is can be used to determine if an antenna is resonant at the desired operating resonant at the desired operating frequency?frequency?

A.A. A VTVMA VTVM

B.B. An antenna analyzerAn antenna analyzer

C.C. A "Q" meterA "Q" meter

D.D. A frequency counterA frequency counter

T7C02 Which of the following instruments can T7C02 Which of the following instruments can be used to determine if an antenna is be used to determine if an antenna is resonant at the desired operating frequency?resonant at the desired operating frequency?

A.A. A VTVMA VTVM

B.B. An antenna analyzerAn antenna analyzerC.C. A "Q" meterA "Q" meter

D.D. A frequency counterA frequency counter

T7C03 What, in general terms, is standing T7C03 What, in general terms, is standing wave ratio (SWR)?wave ratio (SWR)?

A.A. A measure of how well a load is matched to a A measure of how well a load is matched to a transmission linetransmission line

B.B. The ratio of high to low impedance in a feedlineThe ratio of high to low impedance in a feedline

C.C. The transmitter efficiency ratioThe transmitter efficiency ratio

D.D. An indication of the quality of your station's An indication of the quality of your station's ground connectionground connection

T7C03 What, in general terms, is standing T7C03 What, in general terms, is standing wave ratio (SWR)?wave ratio (SWR)?

A.A. A measure of how well a load is matched A measure of how well a load is matched to a transmission lineto a transmission lineB.B. The ratio of high to low impedance in a feedlineThe ratio of high to low impedance in a feedline

C.C. The transmitter efficiency ratioThe transmitter efficiency ratio

D.D. An indication of the quality of your station's An indication of the quality of your station's ground connectionground connection

T7C04 What reading on an SWR meter T7C04 What reading on an SWR meter indicates a perfect impedance match indicates a perfect impedance match between the antenna and the feedline?between the antenna and the feedline?

A.A. 2 to 12 to 1

B.B. 1 to 31 to 3

C.C. 1 to 11 to 1

D.D. 10 to 110 to 1

T7C04 What reading on an SWR meter T7C04 What reading on an SWR meter indicates a perfect impedance match between indicates a perfect impedance match between the antenna and the feedline?the antenna and the feedline?

A.A. 2 to 12 to 1

B.B. 1 to 31 to 3

C.C. 1 to 11 to 1D.D. 10 to 110 to 1

T7C05 What is the approximate SWR value T7C05 What is the approximate SWR value above which the protection circuits in above which the protection circuits in most solid-state transmitters begin to most solid-state transmitters begin to reduce transmitter power?reduce transmitter power?

A.A. 2 to 12 to 1

B.B. 1 to 21 to 2

C.C. 6 to 16 to 1

D.D. 10 to 110 to 1

T7C05 What is the approximate SWR value T7C05 What is the approximate SWR value above which the protection circuits in most above which the protection circuits in most solid-state transmitters begin to reduce solid-state transmitters begin to reduce transmitter power?transmitter power?

A.A. 2 to 12 to 1B.B. 1 to 21 to 2

C.C. 6 to 16 to 1

D.D. 10 to 110 to 1

T7C06 What does an SWR reading of 4:1 T7C06 What does an SWR reading of 4:1 mean?mean?

A.A. An antenna loss of 4 dBAn antenna loss of 4 dB

B.B. A good impedance matchA good impedance match

C.C. An antenna gain of 4An antenna gain of 4

D.D. An impedance mismatchAn impedance mismatch

T7C06 What does an SWR reading of 4:1 T7C06 What does an SWR reading of 4:1 mean?mean?

A.A. An antenna loss of 4 dBAn antenna loss of 4 dB

B.B. A good impedance matchA good impedance match

C.C. An antenna gain of 4An antenna gain of 4

D.D. An impedance mismatchAn impedance mismatch

T7C07 What happens to power lost in a T7C07 What happens to power lost in a feedline?feedline?

A.A. It increases the SWRIt increases the SWR

B.B. It comes back into your transmitter and could It comes back into your transmitter and could cause damagecause damage

C.C. It is converted into heatIt is converted into heat

D.D. It can cause distortion of your signalIt can cause distortion of your signal

T7C07 What happens to power lost in a T7C07 What happens to power lost in a feedline?feedline?

A.A. It increases the SWRIt increases the SWR

B.B. It comes back into your transmitter and could It comes back into your transmitter and could cause damagecause damage

C.C. It is converted into heatIt is converted into heatD.D. It can cause distortion of your signalIt can cause distortion of your signal

T7C08 What instrument other than an SWR T7C08 What instrument other than an SWR meter could you use to determine if a meter could you use to determine if a feedline and antenna are properly feedline and antenna are properly matched?matched?

A.A. VoltmeterVoltmeter

B.B. OhmmeterOhmmeter

C.C. Iambic pentameterIambic pentameter

D.D. Directional wattmeterDirectional wattmeter

T7C08 What instrument other than an SWR T7C08 What instrument other than an SWR meter could you use to determine if a feedline meter could you use to determine if a feedline and antenna are properly matched?and antenna are properly matched?

A.A. VoltmeterVoltmeter

B.B. OhmmeterOhmmeter

C.C. Iambic pentameterIambic pentameter

D.D. Directional wattmeterDirectional wattmeter

T7C09 Which of the following is the most T7C09 Which of the following is the most common cause for failure of coaxial common cause for failure of coaxial cables?cables?

A.A. Moisture contaminationMoisture contamination

B.B. Gamma raysGamma rays

C.C. The velocity factor exceeds 1.0The velocity factor exceeds 1.0

D.D. OverloadingOverloading

T7C09 Which of the following is the most T7C09 Which of the following is the most common cause for failure of coaxial cables?common cause for failure of coaxial cables?

A.A. Moisture contaminationMoisture contaminationB.B. Gamma raysGamma rays

C.C. The velocity factor exceeds 1.0The velocity factor exceeds 1.0

D.D. OverloadingOverloading

T7C10 Why should the outer jacket of T7C10 Why should the outer jacket of coaxial cable be resistant to ultraviolet coaxial cable be resistant to ultraviolet light?light?

A.A. Ultraviolet resistant jackets prevent harmonic Ultraviolet resistant jackets prevent harmonic radiationradiation

B.B. Ultraviolet light can increase losses in the cable's Ultraviolet light can increase losses in the cable's jacketjacket

C.C. Ultraviolet and RF signals can mix together, Ultraviolet and RF signals can mix together, causing interferencecausing interference

D.D. Ultraviolet light can damage the jacket and allow Ultraviolet light can damage the jacket and allow water to enter the cablewater to enter the cable

T7C10 Why should the outer jacket of coaxial T7C10 Why should the outer jacket of coaxial cable be resistant to ultraviolet light?cable be resistant to ultraviolet light?

A.A. Ultraviolet resistant jackets prevent harmonic Ultraviolet resistant jackets prevent harmonic radiationradiation

B.B. Ultraviolet light can increase losses in the cable's Ultraviolet light can increase losses in the cable's jacketjacket

C.C. Ultraviolet and RF signals can mix together, Ultraviolet and RF signals can mix together, causing interferencecausing interference

D.D. Ultraviolet light can damage the jacket Ultraviolet light can damage the jacket and allow water to enter the cableand allow water to enter the cable

T7C11 What is a disadvantage of "air core" T7C11 What is a disadvantage of "air core" coaxial cable when compared to foam or coaxial cable when compared to foam or solid dielectric types?solid dielectric types?

A.A. It has more loss per footIt has more loss per foot

B.B. It cannot be used for VHF or UHF antennasIt cannot be used for VHF or UHF antennas

C.C. It requires special techniques to prevent water It requires special techniques to prevent water absorptionabsorption

D.D. It cannot be used at below freezing temperaturesIt cannot be used at below freezing temperatures

T7C11 What is a disadvantage of "air core" T7C11 What is a disadvantage of "air core" coaxial cable when compared to foam or solid coaxial cable when compared to foam or solid dielectric types?dielectric types?

A.A. It has more loss per footIt has more loss per foot

B.B. It cannot be used for VHF or UHF antennasIt cannot be used for VHF or UHF antennas

C.C. It requires special techniques to prevent It requires special techniques to prevent water absorptionwater absorptionD.D. It cannot be used at below freezing temperaturesIt cannot be used at below freezing temperatures

T7D01 Which instrument would you use to T7D01 Which instrument would you use to measure electric potential or electromotive measure electric potential or electromotive force?force?

A.A. An ammeterAn ammeter

B.B. A voltmeterA voltmeter

C.C. A wavemeterA wavemeter

D.D. An ohmmeterAn ohmmeter

T7D01 Which instrument would you use to T7D01 Which instrument would you use to measure electric potential or electromotive measure electric potential or electromotive force?force?

A.A. An ammeterAn ammeter

B.B. A voltmeterA voltmeterC.C. A wavemeterA wavemeter

D.D. An ohmmeterAn ohmmeter

T7D02 What is the correct way to connect T7D02 What is the correct way to connect a voltmeter to a circuit?a voltmeter to a circuit?

A.A. In series with the circuitIn series with the circuit

B.B. In parallel with the circuitIn parallel with the circuit

C.C. In quadrature with the circuitIn quadrature with the circuit

D.D. In phase with the circuitIn phase with the circuit

T7D02 What is the correct way to connect a T7D02 What is the correct way to connect a voltmeter to a circuit?voltmeter to a circuit?

A.A. In series with the circuitIn series with the circuit

B.B. In parallel with the circuitIn parallel with the circuitC.C. In quadrature with the circuitIn quadrature with the circuit

D.D. In phase with the circuitIn phase with the circuit

T7D03 How is an ammeter usually T7D03 How is an ammeter usually connected to a circuit?connected to a circuit?

A.A. In series with the circuitIn series with the circuit

B.B. In parallel with the circuitIn parallel with the circuit

C.C. In quadrature with the circuitIn quadrature with the circuit

D.D. In phase with the circuitIn phase with the circuit

T7D03 How is an ammeter usually connected T7D03 How is an ammeter usually connected to a circuit?to a circuit?

A.A. In series with the circuitIn series with the circuitB.B. In parallel with the circuitIn parallel with the circuit

C.C. In quadrature with the circuitIn quadrature with the circuit

D.D. In phase with the circuitIn phase with the circuit

T7D04 Which instrument is used to T7D04 Which instrument is used to measure electric current?measure electric current?

A.A. An ohmmeterAn ohmmeter

B.B. A wavemeterA wavemeter

C.C. A voltmeterA voltmeter

D.D. An ammeterAn ammeter

T7D04 Which instrument is used to measure T7D04 Which instrument is used to measure electric current?electric current?

A.A. An ohmmeterAn ohmmeter

B.B. A wavemeterA wavemeter

C.C. A voltmeterA voltmeter

D.D. An ammeterAn ammeter

T7D05 What instrument is used to measure T7D05 What instrument is used to measure resistance?resistance?

A.A. An oscilloscopeAn oscilloscope

B.B. A spectrum analyzerA spectrum analyzer

C.C. A noise bridgeA noise bridge

D.D. An ohmmeterAn ohmmeter

T7D05 What instrument is used to measure T7D05 What instrument is used to measure resistance?resistance?

A.A. An oscilloscopeAn oscilloscope

B.B. A spectrum analyzerA spectrum analyzer

C.C. A noise bridgeA noise bridge

D.D. An ohmmeterAn ohmmeter

T7D06 Which of the following might T7D06 Which of the following might damage a multimeter?damage a multimeter?

A.A. Measuring a voltage too small for the chosen scaleMeasuring a voltage too small for the chosen scale

B.B. Leaving the meter in the milliamps position Leaving the meter in the milliamps position overnightovernight

C.C. Attempting to measure voltage when using the Attempting to measure voltage when using the resistance settingresistance setting

D.D. Not allowing it to warm up properlyNot allowing it to warm up properly

T7D06 Which of the following might damage a T7D06 Which of the following might damage a multimeter?multimeter?

A.A. Measuring a voltage too small for the chosen scaleMeasuring a voltage too small for the chosen scale

B.B. Leaving the meter in the milliamps position Leaving the meter in the milliamps position overnightovernight

C.C. Attempting to measure voltage when Attempting to measure voltage when using the resistance settingusing the resistance settingD.D. Not allowing it to warm up properlyNot allowing it to warm up properly

T7D07 Which of the following T7D07 Which of the following measurements are commonly made using measurements are commonly made using a multimeter?a multimeter?

A.A. SWR and RF powerSWR and RF power

B.B. Signal strength and noiseSignal strength and noise

C.C. Impedance and reactanceImpedance and reactance

D.D. Voltage and resistanceVoltage and resistance

T7D07 Which of the following measurements T7D07 Which of the following measurements are commonly made using a multimeter?are commonly made using a multimeter?

A.A. SWR and RF powerSWR and RF power

B.B. Signal strength and noiseSignal strength and noise

C.C. Impedance and reactanceImpedance and reactance

D.D. Voltage and resistanceVoltage and resistance

T7D08 Which of the following types of T7D08 Which of the following types of solder is best for radio and electronic use?solder is best for radio and electronic use?

A.A. Acid-core solderAcid-core solder

B.B. Silver solderSilver solder

C.C. Rosin-core solderRosin-core solder

D.D. Aluminum solderAluminum solder

T7D08 Which of the following types of solder T7D08 Which of the following types of solder is best for radio and electronic use?is best for radio and electronic use?

A.A. Acid-core solderAcid-core solder

B.B. Silver solderSilver solder

C.C. Rosin-core solderRosin-core solderD.D. Aluminum solderAluminum solder

T7D09 What is the characteristic T7D09 What is the characteristic appearance of a "cold" solder joint?appearance of a "cold" solder joint?

A.A. Dark black spotsDark black spots

B.B. A bright or shiny surfaceA bright or shiny surface

C.C. A grainy or dull surfaceA grainy or dull surface

D.D. A greenish tintA greenish tint

T7D09 What is the characteristic appearance T7D09 What is the characteristic appearance of a "cold" solder joint?of a "cold" solder joint?

A.A. Dark black spotsDark black spots

B.B. A bright or shiny surfaceA bright or shiny surface

C.C. A grainy or dull surfaceA grainy or dull surfaceD.D. A greenish tintA greenish tint

T7D10 What is probably happening when T7D10 What is probably happening when an ohmmeter, connected across a circuit, an ohmmeter, connected across a circuit, initially indicates a low resistance and then initially indicates a low resistance and then shows increasing resistance with time?shows increasing resistance with time?

A.A. The ohmmeter is defectiveThe ohmmeter is defective

B.B. The circuit contains a large capacitorThe circuit contains a large capacitor

C.C. The circuit contains a large inductorThe circuit contains a large inductor

D.D. The circuit is a relaxation oscillatorThe circuit is a relaxation oscillator

T7D10 What is probably happening when an T7D10 What is probably happening when an ohmmeter, connected across a circuit, initially ohmmeter, connected across a circuit, initially indicates a low resistance and then shows indicates a low resistance and then shows increasing resistance with time?increasing resistance with time?

A.A. The ohmmeter is defectiveThe ohmmeter is defective

B.B. The circuit contains a large capacitorThe circuit contains a large capacitorC.C. The circuit contains a large inductorThe circuit contains a large inductor

D.D. The circuit is a relaxation oscillatorThe circuit is a relaxation oscillator

T7D11 Which of the following precautions T7D11 Which of the following precautions should be taken when measuring circuit should be taken when measuring circuit resistance with an ohmmeter?resistance with an ohmmeter?

A.A. Ensure that the applied voltages are correctEnsure that the applied voltages are correct

B.B. Ensure that the circuit is not poweredEnsure that the circuit is not powered

C.C. Ensure that the circuit is groundedEnsure that the circuit is grounded

D.D. Ensure that the circuit is operating at the correct Ensure that the circuit is operating at the correct frequencyfrequency

T7D11 Which of the following precautions T7D11 Which of the following precautions should be taken when measuring circuit should be taken when measuring circuit resistance with an ohmmeter?resistance with an ohmmeter?

A.A. Ensure that the applied voltages are correctEnsure that the applied voltages are correct

B.B. Ensure that the circuit is not poweredEnsure that the circuit is not poweredC.C. Ensure that the circuit is groundedEnsure that the circuit is grounded

D.D. Ensure that the circuit is operating at the correct Ensure that the circuit is operating at the correct frequencyfrequency

97Microhams 2010 Technician

SUBELEMENT T7SUBELEMENT T7[4 exam questions – 4 groups][4 exam questions – 4 groups]