Practice the published Technician licence exam questions

T7A01

Which term describes the ability of a receiver to detect the presence of a signal?

1. A. RF gain
2. B. Sensitivity
3. C. Selectivity
4. D. Total Harmonic Distortion

T7A02

What is a transceiver?

1. A. A device that combines a receiver and transmitter
2. B. A device for matching feed line impedance to 50 ohms
3. C. A device for automatically sending and decoding Morse code
4. D. A device for converting receiver and transmitter frequencies to another band

T7A03

Which of the following is used to convert a signal from one frequency to another?

1. A. Phase splitter
2. B. Mixer
3. C. Inverter
4. D. Amplifier

T7A04

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

1. A. Discrimination ratio
2. B. Sensitivity
3. C. Selectivity
4. D. Harmonic distortion

T7A05

What is the name of a circuit that generates a signal at a specific frequency?

1. A. Reactance modulator
2. B. Phase modulator
3. C. Low-pass filter
4. D. Oscillator

T7A06

What device converts the RF input and output of a transceiver to another band?

1. A. High-pass filter
2. B. Low-pass filter
3. C. Transverter
4. D. Phase converter

T7A07

What is the function of a transceiver’s PTT input?

1. A. Input for a key used to send CW
2. B. Switches transceiver from receive to transmit when grounded
3. C. Provides a transmit tuning tone when grounded
4. D. Input for a preamplifier tuning tone

T7A08

Which of the following describes combining speech with an RF carrier signal?

1. A. Impedance matching
2. B. Oscillation
3. C. Modulation
4. D. Low-pass filtering

T7A09

What is the function of the switch which selects either SSB or CW-FM on some VHF power amplifiers?

1. A. Change the mode of the transmitted signal
2. B. Set the amplifier for proper operation in the selected mode
3. C. Change the frequency range of the amplifier to operate in the proper segment of the band
4. D. Reduce the received signal noise

T7A10

What can be added to the output of a transceiver to increase the transmitted output power?

1. A. A potentiometer
2. B. An RF power amplifier
3. C. An impedance multiplier
4. D. All these choices are correct

T7A11

What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?

1. A. Set the receive and transmit frequency
2. B. Provide automatic frequency control
3. C. Inject a variable frequency to allow CW reception
4. D. Generate and demodulate single sideband signals

T7B01

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

1. A. Talk louder into the microphone
2. B. Let the transceiver cool off
3. C. Change to a higher power level
4. D. Talk farther away from the microphone

T7B02

What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?

1. A. The receiver is unable to reject strong signals outside the AM or FM band
2. B. The microphone gain of the transmitter is turned up too high
3. C. The audio amplifier of the transmitter is overloaded
4. D. The deviation of an FM transmitter is set too low

T7B03

Which of the following can cause radio frequency interference?

1. A. Fundamental overload
2. B. Harmonics
3. C. Spurious emissions
4. D. All these choices are correct

T7B04

Which of the following might be the cause of low RF power output from a solid-state transceiver?

1. A. Poor amplifier noise figure
2. B. Poor amplifier linearity
3. C. Low SWR
4. D. High SWR

T7B05

Which of the following might reduce interference by an amateur station to a non-amateur over-the-air radio receiver?

1. A. Block the amateur signal with a filter at the antenna input of the affected receiver
2. B. Block the interfering signal with a filter on the amateur transmitter
3. C. Switch the transmitter from FM to SSB
4. D. Switch the transmitter to a narrow-band mode

T7B06

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?

1. A. 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
2. B. Immediately turn off your transmitter and contact the nearest FCC office for assistance
3. C. Install a harmonic doubler on the output of your transmitter and tune it until the interference is eliminated
4. D. All these choices are correct

T7B07

Which of the following can reduce interference to a 2-meter band transceiver from a nearby commercial FM station?

1. A. Installing an RF preamplifier
2. B. Using double-shielded coaxial cable
3. C. Installing bypass capacitors on the microphone cable
4. D. Installing a band-reject filter

T7B08

What should you do if something in a neighbor’s home is causing harmful interference to your amateur station?

1. A. Work with your neighbor to identify the offending device
2. B. Politely inform your neighbor that FCC rules prohibit the use of devices that cause interference
3. C. Make sure your station meets the standards of good amateur practice
4. D. All these choices are correct

T7B09

What should be the first step to resolve non-fiber optic cable TV interference caused by your amateur radio transmission?

1. A. Add a low-pass filter to the TV antenna input
2. B. Add a high-pass filter to the TV antenna input
3. C. Add a preamplifier to the TV antenna input
4. D. Be sure all TV feed line coaxial connectors are installed properly

T7B10

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

1. A. Your transmitter is slightly off frequency
2. B. You are speaking too loudly or too close to the microphone
3. C. You are in a bad location
4. D. All these choices are correct

T7B11

Which of the following can eliminate distorted voice transmissions?

1. A. Adding extra feedline to the antenna to lower SWR
2. B. Turning the radio on and off to reset the computer-controlled circuitry
3. C. Adding a clip-on ferrite “choke” to the microphone cable to prevent the transmitted signal from feeding back into the transmitter
4. D. Turning the squelch control fully clockwise to prevent the transmitted signal from triggering the squelch circuit

T7C01

What is the primary purpose of a dummy load?

1. A. To prevent transmitting signals over the air when making tests
2. B. To prevent over-modulation of a transmitter
3. C. To improve the efficiency of an antenna
4. D. To improve the signal-to-noise ratio of a receiver

T7C02

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

1. A. A VTVM
2. B. An antenna analyzer
3. C. A Q meter
4. D. A frequency counter

T7C03

What does a typical RF dummy load consist of?

1. A. A low-voltage power supply and an AC relay
2. B. A 50-ohm non-inductive resistor mounted on a heat sink
3. C. A low-voltage power supply and a DC relay
4. D. A 50-ohm inductive reactance mounted in a shielded enclosure

T7C04

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

1. A. 50:50
2. B. Zero
3. C. 1:1
4. D. Full Scale

T7C05

Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?

1. A. To protect the RF output amplifier transistors
2. B. To comply with FCC rules on spectral purity
3. C. Because power supplies cannot supply enough current at high SWR
4. D. To lower the SWR on the transmission line

T7C06

What does an SWR reading of 4:1 indicate?

1. A. Loss of -4 dB
2. B. Good impedance match
3. C. Gain of +4 dB
4. D. Impedance mismatch

T7C07

What happens to power lost in a feed line?

1. A. It increases the SWR
2. B. It is radiated as harmonics
3. C. It is converted into heat
4. D. It distorts the signal

T7C08

Which instrument can be used to determine SWR?

1. A. Voltmeter
2. B. Ohmmeter
3. C. Iambic pentameter
4. D. Directional wattmeter

T7C09

Which of the following causes failure of coaxial cables?

1. A. Moisture contamination
2. B. Solder flux contamination
3. C. Rapid fluctuation in transmitter output power
4. D. Operation at 100% duty cycle for an extended period

T7C10

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

1. A. Ultraviolet light can increase the resistance of the conductors
2. B. Ultraviolet light can increase losses in the cable’s jacket
3. C. Ultraviolet and RF signals can mix, causing interference
4. D. Ultraviolet light can damage the jacket and allow water to enter the cable

T7C11

What is an advantage of foam-dielectric versus solid-dielectric coaxial cable?

1. A. It is more resistant to moisture contamination
2. B. It has higher voltage breakdown
3. C. It has less loss per foot
4. D. It has a better impedance match to 50 ohms

T7D01

Which instrument would you use to measure electric potential?

1. A. An ammeter
2. B. A voltmeter
3. C. A potentiometer
4. D. An ohmmeter

T7D02

How is a voltmeter connected to a component to measure applied voltage?

1. A. In series
2. B. In parallel
3. C. In quadrature
4. D. In phase

T7D03

When configured to measure current, how is a multimeter connected to a component?

1. A. In series
2. B. In parallel
3. C. In quadrature
4. D. In phase

T7D04

Which instrument is used to measure electric current?

1. A. An ohmmeter
2. B. An electrometer
3. C. A voltmeter
4. D. An ammeter

T7D05

How does an ohmmeter measure the resistance of a circuit or component?

1. A. By applying a small current and measuring the resulting voltage
2. B. By placing a variable resistor in parallel with the circuit
3. C. By placing a variable resistor in series with the circuit
4. D. By applying a variable voltage and measuring the resulting current change

T7D06

Which of the following can damage a multimeter?

1. A. Attempting to measure resistance using the voltage setting
2. B. Failing to connect one of the probes to ground
3. C. Attempting to measure voltage when using the resistance setting
4. D. Not allowing it to warm up properly

T7D07

Which of the following measurements are made using a multimeter?

1. A. Signal strength and noise
2. B. Impedance and reactance
3. C. Voltage and resistance
4. D. All these choices are correct

T7D08

Which of the following types of solder should not be used for radio and electronic applications?

1. A. Acid-core solder
2. B. Lead-tin solder
3. C. Rosin-core solder
4. D. Tin-copper solder

T7D09

What is the characteristic appearance of a cold tin-lead solder joint?

1. A. Dark black spots
2. B. A bright or shiny surface
3. C. A rough or lumpy surface
4. D. A greenish tinge

T7D10

What reading indicates that an ohmmeter is connected across a large, discharged capacitor?

1. A. Increasing resistance with time
2. B. Decreasing resistance with time
3. C. Steady full-scale reading
4. D. Alternating between open and short circuit

T7D11

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

1. A. Ensure that the applied voltages are correct
2. B. Ensure that the circuit is not powered
3. C. Ensure that the circuit is grounded
4. D. Ensure that the circuit is operating at the correct frequency