2.1 - Radio Signals and Waves
T3B04. 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
T3B07. 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
T5B02. 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
T5B04. 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
T5B12. 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
T5C05. What is the unit of frequency? A. Hertz B. Henry C. Farad D. Tesla
A
T5C06. 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
T3B05. 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
T3B08. 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
T3B11. What is the approximate velocity of a radio wave as it travels through free space? A. 150,000 kilometers per second B. 300,000,000 meters per second C. 300,000,000 miles per hour D. 150,000 miles per hour
B
T5B05. Which of the following is equal to 500 milliwatts? A. 0.02 watts B. 0.5 watts C. 5 watts D. 50 watts
B
T5B08. How many microfarads are equal to 1,000,000 picofarads? A. 0.001 microfarads B. 1 microfarad C. 1000 microfarads D. 1,000,000,000 microfarads
B
T3B01. 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
T3B10. 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
T5B01. How many milliamperes is 1.5 amperes? A. 15 milliamperes B. 150 milliamperes C. 1500 milliamperes D. 15,000 milliamperes
C
T5B03. 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
T5B06. 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
T5B07. If a frequency display 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
T5B13. If a frequency display 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
T3B06. 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
T3B09. 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
T5A12. What describes the number of times per second that an alternating current makes a complete cycle? A. Pulse rate B. Speed C. Wavelength D. Frequency
D
T5C14. What is the proper abbreviation for megahertz? A. mHz B. mhZ C. Mhz D. MHz
D