3d153v2 CDC Unit Review
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100 Question Test CDC Unit Review, Volume 2
- 1.Equipment used for generating, amplifying, and transmitting RF carrier is collectively called
- A.
A receiver.
- B.
An antenna.
- C.
A transmitter.
- D.
A transmission line.
- 2.What basic receiver function involves having the transmitted electromagnetic wave pass through the receive antenna in such a manner as to induce voltage in the antenna?
- A.
Reproduction
- B.
Reception
- C.
Detection
- D.
Selection
- 3.The ability to reproduce the input signal accurately is the characteristics of the receiver's
- A.
Fidelity
- B.
Capacity
- C.
Sensetivity
- D.
Selectivity
- 4.A combination of a transmitter and receiver that is built as a single unit and sharing common tuned circuits is called a
- A.
Transmitter
- B.
Transceiver
- C.
Receiver
- D.
Coupler
- 5.Which of the following cannot be performed by the transceiver's computerized components and micro-circuitry?
- A.
Specific equipment faults
- B.
Internal equipment tests
- C.
Internal calibrations
- D.
Repair itself
- 6.A transmission line that consists of a center conductor placed inside a metal tube functioning as the outer tube is called a
- A.
Flexible coaxial cable
- B.
Rigid coaxial cable
- C.
Waveguide
- D.
Twin lead
- 7.Which selection best describes the term "cutoff frequency" when discussing the transmission line properties? XL = XL XC= XC
- A.
The frequency where XL becomes so low that the signal is shunted
- B.
The frequency where XC causes the signal to be shunted
- C.
The lowest frequency that the line can pass successfully
- D.
The frequency at which standing waves are maximum
- 8.
![Using figure 1-10, determine the wavelength if the frequency is changed from 150 MHz to 250 MHz
- ProProfs]( "Using figure 1-10, determine the wavelength if the frequency is changed from 150 MHz to 250 MHz")
Using figure 1-10, determine the wavelength if the frequency is changed from 150 MHz to 250 MHz- A.
12.0 meters
- B.
3.0 meters
- C.
1.5 meters
- D.
1.2 meters
- 9.
![Using figure 1-10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.
- ProProfs]( "Using figure 1-10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.")
Using figure 1-10, determine the electrical length if the frequency is changed from 150 MHz to 250 MHz.- A.
8.33 meters
- B.
8.33 wavelengths
- C.
83.3 meters
- D.
83.3 wavelengths
- 10.A nonresonant transmission line is a line
- A.
Having reflected waves
- B.
Having no reflected waves
- C.
With maximum voltage across its open termination
- D.
With a maximum voltage across its shorted termination
- 11.If a transmission line is terminated in a short,
- A.
Current is at maximum and voltage at minimum at the termination
- B.
Current is at minimum and voltage at maximum at the termination
- C.
There would be a nominal amount of signal gain
- D.
The line would be nonresonant
- 12.In a basic communication system, what converts radio frequency (RF) energy's current oscillation into electric and magnetic fields of force?
- A.
Antenna
- B.
Coupler
- C.
Transmitter
- D.
Transmission lines
- 13.The concept that alternation current (AC) changes in magnitude and reverses its direction during each cycle is
- A.
An unproved hypothesis
- B.
The definition of propogation
- C.
What makes radio transmission possible
- D.
What led to the discovery of direct current
- 14.If the electric field component travels in a plane perpendicular to the Earth's surface, the radio wave is
- A.
Magnetically polarized
- B.
Horizontally polarized
- C.
Circularly polarized
- D.
Vertically polarized
- 15.What types of polarization do satellite terminals transmit and receive?
- A.
Transmit horizontal and receive vertical polarizations
- B.
Transmit vertical and receive horizontal polarizations
- C.
Transmit right hand and receive left hand circular polarizations
- D.
Transmit left hand and receive right hand circular polarizations
- 16.What measurement is used to determine whether an antenna is resonant at a particular frequency?
- A.
Distortion
- B.
Standing wave ratio
- C.
Signal-to-noise ratio
- D.
Percent of modulation
- 17.The ability of an antenna to both receive and transmit equally well is known as the antenna's
- A.
Bandwidth
- B.
Resonance
- C.
Reciprocity
- D.
Effectiveness
- 18.The standard used to measure the radiating effectiveness (gain) of an antenna system is the
- A.
Marconi antenna
- B.
Isotropic antenna
- C.
Hertz antenna
- D.
Whip antenna
- 19.What does the effectiveness of an entire transmitting and receiving system depend largely upon?
- A.
Impedance matching
- B.
Antenna distance
- C.
Antenna properties
- D.
Line characteristics
- 20.Which antenna radiates radio energy in a circular pattern?
- A.
Omnidirectional
- B.
Unidirectional
- C.
Bidirectional
- D.
Directional
- 21.Which antenna type is usually used on long-range, point-to-point circuits where the concentrated radio energy is needed for circuitry reliability?
- A.
Omnidirectional
- B.
Unidirectional
- C.
Bidirectional
- D.
Circular
- 22.Ungrounded lengths of wire specifically designed to be either a half-wavelength or more than full wavelength long is called a
- A.
Reflector
- B.
Hertz antenna
- C.
Marconi antenna
- D.
Vertical monopole
- 23.A long-wire's takeoff angle depends on the antenna's
- A.
Length
- B.
Directivity
- C.
Front-to-back ratio
- D.
Standing wave ratio
- 24.All antennas used in satellite communications are designed to be
- A.
Circular directional
- B.
Omnidirectional
- C.
Bidirectional
- D.
Directional
- 25.A common satellite antenna is the
- A.
Whip
- B.
Discone
- C.
Parabolic
- D.
Long-wire
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