3d153v2 CDC Unit Review

100 Questions | By Ashley_baker | Last updated: Mar 21, 2022 | Total Attempts: 352

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100 Question Test CDC Unit Review, Volume 2

Questions and Answers

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 = X_L XC= X_C
- 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
- 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.
- 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