HAM Technician T7

Which term describes the ability of a receiver to detect the presence of a signal?
A.  Linearity
B.  Selectivity
C.  Sensitivity
D.  Total Harmonic Distortion

What is a transceiver?
A.  A type of antenna matching network
B.  A unit combining the functions of a transmitter and a receiver
C.  A component in a repeater that filters out unwanted interference
D.  A type of antenna switch

Which of the following is used to convert a radio signal from one frequency to another?
A.  Mixer
B.  Amplifier
C.  Inverter
D.  Phase splitter

Which term describes the ability of a receiver to discriminate between multiple signals?
A.  Discrimination ratio
B.  Selectivity
C.  Harmonic distortion
D.  Sensitivity

What is the name of a circuit that generates a signal at a specific frequency?
A.  Product detector
B.  Low-pass filter
C.  Reactance modulator
D.  Oscillator

What device converts the RF input and output of a transceiver to another band?
A.  High-pass filter
B.  Transverter
C.  Phase converter
D.  Low-pass filter

What is meant by "PTT"?
A.  The push-to-talk function that switches between receive and transmit
B.  A primary transformer tuner use to match antennas
C.  Pre-transmission tuning to reduce transmitter harmonic emission
D.  Precise tone transmissions used to limit repeater access to only certain signals

Which of the following describes combining speech with an RF carrier signal?
A.  Modulation
B.  Impedance matching
C.  Oscillation
D.  Low-pass filtering

What is the function of the SSB/CW-FM switch on a VHF power amplifier?
A.  Reduce the received signal noise
B.  Change the frequency range of the amplifier to operate in the proper portion of the band
C.  Change the mode of the transmitted signal
D.  Set the amplifier for proper operation in the selected mode

What device increases the low-power output from a handheld transceiver?
A.  All of these choices are correct
B.  A voltage divider
C.  An impedance network
D.  An RF power amplifier

Where is an RF preamplifier installed?
A.  Between the antenna and receiver
B.  At the output of the transmitter's power amplifier
C.  At the receiver's audio output
D.  Between a transmitter and antenna tuner

What can you do if you are told your FM handheld or mobile transceiver is over-deviating?
A.  Let the transceiver cool off
B.  Change to a higher power level
C.  Talk farther away from the microphone
D.  Talk louder into the microphone

What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?
A.  The microphone gain of the transmitter is turned up too high
B.  The deviation of an FM transmitter is set too low
C.  The audio amplifier of the transmitter is overloaded
D.  The receiver is unable to reject strong signals outside the AM or FM band

Which of the following can cause radio frequency interference?
A.  Fundamental overload
B.  Spurious emissions
C.  Harmonics
D.  All of these choices are correct

Which of the following is a way to reduce or eliminate interference from an amateur transmitter to a nearby telephone?
A.  Reduce the microphone gain
B.  Put an RF filter on the telephone
C.  Reduce the SWR on the transmitter transmission line
D.  Put a filter on the amateur transmitter

How can overload of a non-amateur radio or TV receiver by an amateur signal be reduced or eliminated?
A.  Block the interfering signal with a filter on the amateur transmitter
B.  Block the amateur signal with a filter at the antenna input of the affected receiver
C.  Switch the transmitter from FM to SSB
D.  Switch the transmitter to a narrow-band mode

Which of the following actions should you take if a neighbor tells you that your station's transmissions are interfering with their radio or TV reception?
A.  Immediately turn off your transmitter and contact the nearest FCC office for assistance
B.  Make sure that your station is functioning properly and that it does not cause interference to your own radio or television when it is tuned to the same channel
C.  Install a harmonic doubler on the output of your transmitter and tune it until the interference is eliminated
D.  Tell them that your license gives you the right to transmit and nothing can be done to reduce the interference

Which of the following can reduce overload to a VHF transceiver from a nearby FM broadcast station?
A.  Using headphones instead of the speaker
B.  RF preamplifier
C.  Band-reject filter
D.  Double-shielded coaxial cable

What should you do if something in a neighbor's home is causing harmful interference to your amateur station?
A.  All of these choices are correct
B.  Check your station and make sure it meets the standards of good amateur practice
C.  Politely inform your neighbor about the rules that prohibit the use of devices that cause interference
D.  Work with your neighbor to identify the offending device

What is a Part 15 device?
A.  A type of test set used to determine whether a transmitter complies with FCC regulation 91.15
B.  A device for long-distance communications using special codes sanctioned by the International Amateur Radio Union
C.  An unlicensed device that may emit low-powered radio signals on frequencies used by a licensed service
D.  An amplifier that has been type-certified for amateur radio

What might be a problem if you receive a report that your audio signal through the repeater is distorted or unintelligible?
A.  Your batteries are running low
B.  Your transmitter is slightly off frequency
C.  You are in a bad location
D.  All of these choices are correct

What is a symptom of RF feedback in a transmitter or transceiver?
A.  Reports of garbled, distorted, or unintelligible voice transmissions
B.  The transmitter will not stay on the desired frequency
C.  Frequent blowing of power supply fuses
D.  Excessive SWR at the antenna connection

What should be the first step to resolve cable TV interference from your ham radio transmission?
A.  Add a high-pass filter to the TV antenna input
B.  Add a low-pass filter to the TV antenna input
C.  Be sure all TV coaxial connectors are installed properly
D.  Add a preamplifier to the TV antenna input

What is the primary purpose of a dummy load?
A.  To improve the signal-to-noise ratio of a receiver
B.  To improve the efficiency of an antenna
C.  To prevent over-modulation of a transmitter
D.  To prevent transmitting signals over the air when making tests

Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency?
A.  An antenna analyzer
B.  A VTVM
C.  A Q meter
D.  A frequency counter

What, in general terms, is standing wave ratio (SWR)?
A.  The transmitter efficiency ratio
B.  The ratio of high to low impedance in a feed line
C.  An indication of the quality of your station's ground connection
D.  A measure of how well a load is matched to a transmission line

What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?
A.  2 to 1
B.  1 to 1
C.  10 to 1
D.  1 to 3

Why do most solid-state amateur radio transmitters reduce output power as SWR increases?
A.  To comply with FCC rules on spectral purity
B.  Because power supplies cannot supply enough current at high SWR
C.  To protect the output amplifier transistors
D.  To improve the impedance match to the feed line

What does an SWR reading of 4:1 indicate?
A.  Impedance mismatch
B.  Good impedance match
C.  Loss of -4 dB
D.  Gain of +4 dB

What happens to power lost in a feed line?
A.  It increases the SWR
B.  It is converted into heat
C.  It can cause distortion of your signal
D.  It comes back into your transmitter and could cause damage

What instrument other than an SWR meter could you use to determine if a feed line and antenna are properly matched?
A.  Voltmeter
B.  Iambic pentameter
C.  Directional wattmeter
D.  Ohmmeter

Which of the following is the most common cause for failure of coaxial cables?
A.  Moisture contamination
B.  The velocity factor exceeds 1.0
C.  Gamma rays
D.  Overloading

Why should the outer jacket of coaxial cable be resistant to ultraviolet light?
A.  Ultraviolet light can increase losses in the cable's jacket
B.  Ultraviolet resistant jackets prevent harmonic radiation
C.  Ultraviolet light can damage the jacket and allow water to enter the cable
D.  Ultraviolet and RF signals can mix, causing interference

What is a disadvantage of air core coaxial cable when compared to foam or solid dielectric types?
A.  It cannot be used at below freezing temperatures
B.  It requires special techniques to prevent water absorption
C.  It cannot be used for VHF or UHF antennas
D.  It has more loss per foot

What does a dummy load consist of?
A.  A 50 ohm reactance used to terminate a transmission line
B.  A non-inductive resistor and a heat sink
C.  A low-voltage power supply and a DC relay
D.  A high-gain amplifier and a TR switch

Which instrument would you use to measure electric potential or electromotive force?
A.  An ammeter
B.  An ohmmeter
C.  A voltmeter
D.  A wavemeter

What is the correct way to connect a voltmeter to a circuit?
A.  In quadrature with the circuit
B.  In parallel with the circuit
C.  In series with the circuit
D.  In phase with the circuit

How is a simple ammeter connected to a circuit?
A.  In phase with the circuit
B.  In quadrature with the circuit
C.  In series with the circuit
D.  In parallel with the circuit

Which instrument is used to measure electric current?
A.  A voltmeter
B.  An ohmmeter
C.  An ammeter
D.  A wavemeter

What instrument is used to measure resistance?
A.  A noise bridge
B.  An oscilloscope
C.  A spectrum analyzer
D.  An ohmmeter

Which of the following might damage a multimeter?
A.  Attempting to measure voltage when using the resistance setting
B.  Not allowing it to warm up properly
C.  Leaving the meter in the milliamps position overnight
D.  Measuring a voltage too small for the chosen scale

Which of the following measurements are commonly made using a multimeter?
A.  SWR and RF power
B.  Signal strength and noise
C.  Impedance and reactance
D.  Voltage and resistance

Which of the following types of solder is best for radio and electronic use?
A.  Acid-core solder
B.  Rosin-core solder
C.  Aluminum solder
D.  Silver solder

What is the characteristic appearance of a cold solder joint?
A.  A greenish tint
B.  Dark black spots
C.  A bright or shiny surface
D.  A grainy or dull surface

What is probably happening when an ohmmeter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time?
A.  The circuit is a relaxation oscillator
B.  The circuit contains a large capacitor
C.  The ohmmeter is defective
D.  The circuit contains a large inductor

Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?
A.  Ensure that the circuit is grounded
B.  Ensure that the circuit is not powered
C.  Ensure that the applied voltages are correct
D.  Ensure that the circuit is operating at the correct frequency

Which of the following precautions should be taken when measuring high voltages with a voltmeter?
A.  Ensure that the voltmeter is set to the correct frequency
B.  Ensure that the voltmeter has very low impedance
C.  Ensure that the circuit is grounded through the voltmeter
D.  Ensure that the voltmeter and leads are rated for use at the voltages to be measured