00-Technician Test Flashcards
What term describes the number of times per second that an alternating current reverses direction? A. Pulse rate B. Speed C. Wavelength D. Frequency
D. Frequency
What is the unit of frequency? A. Hertz B. Henry C. Farad D. Tesla
A. Hertz
What does the abbreviation “RF” refer to?
A. Radio frequency signals of all types
B. The resonant frequency of a tuned circuit
C. The real frequency transmitted as opposed to the apparent frequency
D. Reflective force in antenna transmission lines
A. Radio frequency signals of all types
What are the frequency limits of the VHF spectrum? A. 30 to 300 kHz B. 30 to 300 MHz C. 300 to 3000 kHz D. 300 to 3000 MHz
B. 30 to 300 MHz
What are the frequency limits of the UHF spectrum? A. 30 to 300 kHz B. 30 to 300 MHz C. 300 to 3000 kHz D. 300 to 3000 MHz
D. 300 to 3000 MHz
What frequency range is referred to as HF? A. 300 to 3000 MHz B. 30 to 300 MHz C. 3 to 30 MHz D. 300 to 3000 kHz
C. 3 to 30 MHz
What is the name for the distance a radio wave travels during one complete cycle? A. Wave speed B. Waveform C. Wavelength D. Wave spread
C. Wavelength
How fast does a radio wave travel through free space?
A. At the speed of light
B. At the speed of sound
C. Its speed is inversely proportional to its wavelength
D. Its speed increases as the frequency increases
A. At the speed of light
What is the approximate velocity of a radio wave as it travels through free space? A. 3000 kilometers per second B. 300,000,000 meters per second C. 300,000 miles per hour D. 186,000 miles per hour
B. 300,000,000 meters per second
How does the wavelength of a radio wave relate to its frequency?
A. The wavelength gets longer as the frequency increases
B. The wavelength gets shorter as the frequency increases
C. There is no relationship between wavelength and frequency
D. The wavelength depends on the bandwidth of the signal
B. The wavelength gets shorter as the frequency increases
What property of radio waves is often used to identify the different frequency bands?
A. The approximate wavelength
B. The magnetic intensity of waves
C. The time it takes for waves to travel one mile
D. The voltage standing wave ratio of waves
A. The approximate wavelength
What is the formula for converting frequency to approximate wavelength in meters?
A. Wavelength in meters equals frequency in hertz multiplied by 300
B. Wavelength in meters equals frequency in hertz divided by 300
C. Wavelength in meters equals frequency in megahertz divided by 300
D. Wavelength in meters equals 300 divided by frequency in megahertz
D. Wavelength in meters equals 300 divided by frequency in megahertz
Which of the following is a form of amplitude modulation? A. Spread-spectrum B. Packet radio C. Single sideband D. Phase shift keying
C. Single sideband
What happens when the deviation of an FM transmitter is increased?
A. Its signal occupies more bandwidth
B. Its output power increases
C. Its output power and bandwidth increases
D. Asymmetric modulation occurs
A. Its signal occupies more bandwidth
What could cause your FM signal to interfere with stations on nearby frequencies?
A. Microphone gain too high, causing over-deviation
B. SWR too high
C. Incorrect CTCSS Tone
D. All of these choices are correct
A. Microphone gain too high, causing over-deviation
Why should you not set your transmit frequency to be exactly at the edge of an amateur band or sub-band?
A. To allow for calibration error in the transmitter frequency display
B. So that modulation sidebands do not extend beyond the band edge
C. To allow for transmitter frequency drift
D. All of these choices are correct
D. All of these choices are correct
What determines the amount of deviation of an FM (as opposed to PM) signal?
A. Both the frequency and amplitude of the modulating signal
B. The frequency of the modulating signal
C. The amplitude of the modulating signal
D. The relative phase of the modulating signal and the carrier
C. The amplitude of the modulating signal
What type of modulation is most commonly used for VHF packet radio transmissions? A. FM B. SSB C. AM D. Spread Spectrum
A. FM
Which type of voice mode is most often used for long-distance (weak signal) contacts on the VHF and UHF bands? A. FM B. DRM C. SSB D. PM
C. SSB
Which type of modulation is most commonly used for VHF and UHF voice repeaters? A. AM B. SSB C. PSK D. FM
D. FM
Which of the following types of emission has the narrowest bandwidth? A. FM voice B. SSB voice C. CW D. Slow-scan TV
C. CW
Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications? A. Upper sideband B. Lower sideband C. Suppressed sideband D. Inverted sideband
A. Upper sideband
What is the primary advantage of single sideband over FM for voice transmissions?
A. SSB signals are easier to tune
B. SSB signals are less susceptible to interference
C. SSB signals have narrower bandwidth
D. All of these choices are correct
C. SSB signals have narrower bandwidth
What is the approximate bandwidth of a single sideband voice signal? A. 1 kHz B. 3 kHz C. 6 kHz D. 15 kHz
B. 3 kHz
What is the approximate bandwidth of a VHF repeater FM phone signal? A. Less than 500 Hz B. About 150 kHz C. Between 10 and 15 kHz D. Between 50 and 125 kHz ~~
C. Between 10 and 15 kHz
What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band? A. More than 10 MHz B. About 6 MHz C. About 3 MHz D. About 1 MHz
B. About 6 MHz
What is the approximate maximum bandwidth required to transmit a CW signal? A. 2.4 kHz B. 150 Hz C. 1000 Hz D. 15 kHz
B. 150 Hz
What type of amateur station simultaneously retransmits the signal of another amateur station on a different channel or channels? A. Beacon station B. Earth station C. Repeater station D. Message forwarding station
C. Repeater station
What is a transceiver?
A. A type of antenna switch
B. A unit combining the functions of a transmitter and a receiver
C. A component in a repeater which filters out unwanted interference
D. A type of antenna matching network
B. A unit combining the functions of a transmitter and a receiver
Electrical current is measured in which of the following units? A. Volts B. Watts C. Ohms D. Amperes
D. Amperes
What is the name for the flow of electrons in an electric circuit? A. Voltage B. Resistance C. Capacitance D. Current
D. Current
What is the electrical term for the electromotive force (EMF) that causes electron flow? A. Voltage B. Ampere-hours C. Capacitance D. Inductance
A. Voltage
What is the basic unit of electromotive force? A. The volt B. The watt C. The ampere D. The ohm
A. The volt
Which instrument would you use to measure electric potential or electromotive force? A. An ammeter B. A voltmeter C. A wavemeter D. An ohmmeter
B. A voltmeter
What is the correct way to connect a voltmeter to a circuit? A. In series with the circuit B. In parallel with the circuit C. In quadrature with the circuit D. In phase with the circuit
B. In parallel with the circuit
How is an ammeter usually connected to a circuit? A. In series with the circuit B. In parallel with the circuit C. In quadrature with the circuit D. In phase with the circuit
A. In series with the circuit
Which instrument is used to measure electric current? A. An ohmmeter B. A wavemeter C. A voltmeter D. An ammeter
D. An ammeter
How many milliamperes is 1.5 amperes? A. 15 milliamperes B. 150 milliamperes C. 1,500 milliamperes D. 15,000 milliampere
C. 1,500 milliamperes
What is another way to specify a radio signal frequency of 1,500,000 hertz? A. 1500 kHz B. 1500 MHz C. 15 GHz D. 150 kHz
A. 1500 kHz
How many volts are equal to one kilovolt? A. One one-thousandth of a volt B. One hundred volts C. One thousand volts D. One million volts
C. One thousand volts
How many volts are equal to one microvolt? A. One one-millionth of a volt B. One million volts C. One thousand kilovolts D. One one-thousandth of a volt
A. One one-millionth of a volt
Which of the following is equivalent to 500 milliwatts? A. 0.02 watts B. 0.5 watts C. 5 watts D. 50 watts
B. 0.5 watts
If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show? A. 0.003 amperes B. 0.3 amperes C. 3 amperes D. 3,000,000 amperes
C. 3 amperes
If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz? A. 0.003525 kHz B. 35.25 kHz C. 3525 kHz D. 3,525,000 kHz
C. 3525 kHz
How many microfarads are 1,000,000 picofarads? A. 0.001 microfarads B. 1 microfarad C. 1000 microfarads D. 1,000,000,000 microfarads
B. 1 microfarad
Which of the following frequencies is equal to 28,400 kHz? A. 28.400 MHz B. 2.800 MHz C. 284.00 MHz D. 28.400 kHz
A. 28.400 MHz
If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz? A. 0.002425 GHZ B. 24.25 GHz C. 2.425 GHz D. 2425 GHz
C. 2.425 GHz
Which of the following might damage a multimeter?
A. Measuring a voltage too small for the chosen scale
B. Leaving the meter in the milliamps position overnight
C. Attempting to measure voltage when using the resistance setting
D. Not allowing it to warm up properly
C. Attempting to measure voltage when using the resistance setting
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
D. Voltage and resistance
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 ohmmeter is defective
B. The circuit contains a large capacitor
C. The circuit contains a large inductor
D. The circuit is a relaxation oscillator
B. The circuit contains a large capacitor
Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?
A. Ensure that the applied voltages are correct
B. Ensure that the circuit is not powered
C. Ensure that the circuit is grounded
D. Ensure that the circuit is operating at the correct frequency
B. Ensure that the circuit is not powered
Which of the following precautions should be taken when measuring high voltages with a voltmeter?
A. Ensure that the voltmeter has very low impedance
B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured
C. Ensure that the circuit is grounded through the voltmeter
D. Ensure that the voltmeter is set to the correct frequency
B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured
What instrument is used to measure resistance? A. An oscilloscope B. A spectrum analyzer C. A noise bridge D. An ohmmeter
D. An ohmmeter