Vol2 Ure1 CDC 3D153

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  • 1/34 Questions

    (206) The ability of an antenna to both receive and transmit equally well is known as the antenna’s?

    • Bandwidth
    • Resonance
    • Reciprocity
    • Effectiveness
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About This Quiz

This quiz to be used as a study aid for the RF transmission systems 5 level cdc course.

CDC Quizzes & Trivia

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  • 2. 

    (202) A combination of a transmitter and receiver that is built as a single unit and sharing common tuned circuits is called a?

    • Transmitter

    • Transceiver

    • Receiver

    • Coupler

    Correct Answer
    A. Transceiver
  • 3. 

    (203) A transmission line that consists of a center conductor placed inside a metal tube functioning as the outer tube is called a?

    • Flexible coaxial cable

    • Rigid coaxial cable

    • Waveguide

    • Twin lead

    Correct Answer
    A. Rigid coaxial cable
  • 4. 

    (206) What does the effectiveness of an entire transmitting and receiving system depend largely upon?

    • Impedance matching

    • Antenna distance

    • Antenna properties

    • Line characteristics

    Correct Answer
    A. Impedance matching
  • 5. 

    A nonresonant transmission line is a line?

    • Having reflected waves

    • Having no reflected waves

    • With maximum voltage across its open termination

    • With maximum voltage across its shorted termination

    Correct Answer
    A. Having no reflected waves
  • 6. 

    (201) Equipment used for generating, amplifying, and transmitting RF carrier is collectively called a?

    • A receiver

    • An antenna

    • A transmitter

    • A transmission line

    Correct Answer
    A. A transmitter
  • 7. 

    (201) What basic receiver function involves having the transmitted electromagnetic wave pass through the receive antenna in such a manner as to induce a voltage in the antenna?

    • Reproduction

    • Reception

    • Detection

    • Selection

    Correct Answer
    A. Reception
  • 8. 

    (201) The ability to reproduce the input signal accurately is the characteristics of the receiver’s?  

    • Fidelity

    • Capacity

    • Sensitivity

    • Selectivity

    Correct Answer
    A. Fidelity
  • 9. 

    (202) Which of the following cannot be performed by the transceiver’s computerized components and micro-circuitry?

    • Specific equipment faults

    • Internal equipment tests

    • Internal calibrations

    • Repair itself

    Correct Answer
    A. Repair itself
  • 10. 

    (212) Where is the most challenging location for a radio frequency (RF) transmission systems technician to establish and operate a radio station from?

    • Amazon Jungle

    • North Pole

    • Sahara Desert

    • Sierra Nevada mountains

    Correct Answer
    A. Amazon Jungle
  • 11. 

    (203) Using figure 1–10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.

    • 8.33 meters

    • 8.33 wavelengths

    • 83.3 meters

    • 83.3 wavelengths

    Correct Answer
    A. 8.33 wavelengths
  • 12. 

    (204) The concept that alternating current (AC) changes in magnitude and reverses its direction during each cycle is?

    • An unproven hypothesis

    • The definition of propagation

    • What makes radio transmission possible

    • What led to the discovery of direct current

    Correct Answer
    A. What makes radio transmission possible
  • 13. 

    (209) A common satellite antenna is the?

    • Whip

    • Discone

    • Parabolic

    • Long-wire

    Correct Answer
    A. Parabolic
  • 14. 

    (204) In a basic communication system, what converts radio frequency (RF) energy’s current oscillation into electric and magnetic fields of force?

    • Antenna

    • Coupler

    • Transmitter

    • Transmission lines

    Correct Answer
    A. Antenna
  • 15. 

    (210) Which type of airborne antenna can be designed into any part of an aerospace vehicle’s surface, so that it does not upset its aerodynamic properties?

    • Fixed blade

    • Conformal

    • Probe tip

    • Whip

    Correct Answer
    A. Conformal
  • 16. 

    (211) In selecting an antenna for a circuit, what is the first thing to look at?

    • Type of propagation

    • Selecting the antenna

    • Determine the distance

    • Finding the operating frequency

    Correct Answer
    A. Type of propagation
  • 17. 

    (205) If the electric field component travels in a plane perpendicular to the Earth’s surface, the radio wave is?

    • Magnetically polarized

    • Horizontally polarized

    • Circularly polarized

    • Vertically polarized

    Correct Answer
    A. Vertically polarized
  • 18. 

    (206) What measurement is used to determine whether an antenna is resonant at a particular frequency?

    • Distortion

    • Standing Wave Ratio

    • Signal-to-noise ratio

    • Percent of modulation

    Correct Answer
    A. Standing Wave Ratio
  • 19. 

    (209) A helical antenna radiates a signal with what type of polarization?

    • Horizontal

    • Vertical

    • Circular

    • Linear

    Correct Answer
    A. Circular
  • 20. 

    (212) With a mountain between you and the distant end, which antenna is more effective?

    • Whip

    • Dipole

    • Discone

    • Near-Vertical Incidence skywave

    Correct Answer
    A. Near-Vertical Incidence skywave
  • 21. 

    (207) Which antenna radiates radio energy in a circular pattern?

    • Omnidirectional

    • Unidirectional

    • Bidirectional

    • Circular

    Correct Answer
    A. Omnidirectional
  • 22. 

    (207) Which antenna type is usually used on long-range, point-to-point circuits where the concentrated radio energy is needed for circuitry reliability?

    • Omnidirectional

    • Unidirectional

    • Bidirectional

    • Circular

    Correct Answer
    A. Unidirectional
  • 23. 

    (209) A long-wire’s takeoff angle depends on the antenna’s?

    • Length

    • Directivity

    • Front-to-back ratio

    • Standing wave ratio

    Correct Answer
    A. Length
  • 24. 

    (210) Aircraft antennas are housed?

    • Inside nonconductive radomes mounted outside or flush with the fuselage.

    • Inside conductive radomes mounted outside or flush with the fuselage

    • Outside nonconductive radomes mounted outside the fuselage.

    • Inside conductive radomes mounted flush with the fuselage.

    Correct Answer
    A. Inside nonconductive radomes mounted outside or flush with the fuselage.
  • 25. 

    (210) What determines an antenna’s location and orientation on the aircraft?

    • Antennas always reguire a 360 degree radiating pattern.

    • The type of aircraft propulsion and power system.

    • Antennas are always mounted on top of the fuselage.

    • Optimizing the antenna's radiating pattern for its application.

    Correct Answer
    A. Optimizing the antenna's radiating pattern for its application.
  • 26. 

    (203) If a transmission line is terminated in a short,

    • Current is maximum and voltage at minimum at the termination

    • Current is at minimum and voltage at maximum at the termination

    • There would be a nominal amount of signal gain

    • The line would be nonresonant

    Correct Answer
    A. Current is maximum and voltage at minimum at the termination
  • 27. 

    (205) What types of polarization do satellite terminals transmit and receive?

    • Transmit horizontal and receive vertical polarizations

    • Transmit vertical and receive horizontal polarizations

    • Transmit right hand and receive left hand circular polarizations.

    • Transmit left hand and receive right hand circular polarizations

    Correct Answer
    A. Transmit right hand and receive left hand circular polarizations.
  • 28. 

    (212) Which object has the greatest effect on an antenna?

    • Sun

    • Earth

    • Operator

    • Ionosphere

    Correct Answer
    A. Earth
  • 29. 

    (206) The standard used to measure the radiating effectiveness (gain) of an antenna system is the?

    • Marconi antenna

    • Isotropic antenna

    • Hertz antenna

    • Whip antenna

    Correct Answer
    A. Isotropic antenna
  • 30. 

    (208) Ungrounded lengths of wire specifically designed to be either a half-wavelength or more than full wavelength long is called a?

    • Reflector

    • Hertz antenna

    • Marconi antenna

    • Vertical monopole

    Correct Answer
    A. Hertz antenna
  • 31. 

    (203) Using figure 1–10, determine the wavelength if the frequency is changed from 150 MHz to 250 MHz.

    • 12.0 meters.

    • 3.0 meters

    • 1.5 meters

    • 1.2 meters

    Correct Answer
    A. 1.2 meters
  • 32. 

    (209) All antennas used in satellite communications are designed to be?

    • Circular directional

    • Omnidirectional

    • Bidirectional

    • Directional

    Correct Answer
    A. Directional
  • 33. 

    (210) In airborne antenna applications for frequencies in the upper portion of the HF band, what vertical angles are used for multi-hop, long distance transmission?

    • 90 and 180 degrees

    • 60 and 90 degrees

    • 30 and 60 degrees

    • 5 and 30 degrees

    Correct Answer
    A. 5 and 30 degrees
  • 34. 

    (203) Which selection best describes the term “cutoff frequency” when discussing transmission line properties?

    • The frequency where XL becomes so low that the signal is shunted.

    • The frequency where XC causes the signal to be shunted.

    • The lowest frequency that the line can pass successfully

    • The frequency at which standing waves are maximum.

    Correct Answer
    A. The frequency where XC causes the signal to be shunted.

Quiz Review Timeline (Updated): Mar 14, 2022 +

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  • Current Version
  • Mar 14, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 30, 2012
    Quiz Created by
    Jayhuiz23
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