3D1X3 CDC Volume 2 Ure
The second one lol.
- 1.(201) 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.(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?
- A.
Reproduction.
- B.
Reception.
- C.
Detection.
- D.
Selection.
- 3.(201) The ability to reproduce the input signal accurately is the characteristics of the receiver's
- A.
Fidelity.
- B.
Capacity.
- C.
Sensitivity.
- D.
Selectivity.
- 4.(202) 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.(202) 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.(203) 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.(203) Which selection best describes the term "cutoff frequency" when discussing transmission line properties?
- A.
The frequency where XL becomes to 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.(203) 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.(203) 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.(203) 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 maximum voltages across its shorted termination.
- 11.(203) 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.(204) 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.(204) The concept that alternation current (AC) changes in magnitude and reverses its direction during each cycle is
- A.
An unproven hypothesis.
- B.
The definition of propagation.
- C.
What makes radio transmission possible.
- D.
What led to the discovery of direct current.
- 14.(205) 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.(205) 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.(206) 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.(206) 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.(206) 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.(206) 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.(207) Which antenna radiates radio energy in a circular pattern?
- A.
Omnidirectional.
- B.
Unidirectional.
- C.
Bidirectional.
- D.
Directional.
- 21.(207) 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.(208) Ungrounded lengths of wire specifically designed to be either a half-wavelength or more than a full wavelength long is called a
- A.
Reflector.
- B.
Hertz antenna.
- C.
Marconi antenna.
- D.
Vertical monopole.
- 23.(209) 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.(209) All antennas used in satellite communications are designed to be
- A.
Circular directional.
- B.
Omnidirectional.
- C.
Bidirectional.
- D.
Directional.
- 25.(209) A commmon satellite antenna is the
- A.
Whip.
- B.
Discone.
- C.
Parabolic.
- D.
Long-wire.
Questions: 100 | Attempts: 2042 | Last updated: Jul 30, 2011
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