3D153 Practice Exam
This practice exam takes all URE questions from Vol 1 - 3 and randomly gives you 100 to answer. The questions are different every time you take this, so make sure to take this practice test more than once or twice!
Hint: This is the MINIMUM you need to know. The number in parenthesis preceding each question gives you the section the answer can be found in. Be sure to read through each section!
- 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.
Correct Answer
C. A transmitter. -
- 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
Correct Answer
B. Reception -
- 3.
(201) The ability to reproduce the input signal accurately is characteristic of the receiver’s
- A.
Fidelity.
- B.
Capacity.
- C.
Sensitivity.
- D.
Selectivity.
Correct Answer
A. Fidelity. -
- 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.
Correct Answer
B. Transceiver. -
- 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.
The ability to repair itself
Correct Answer
D. The ability to repair itself -
- 6.
(203) A transmission line that consists of a center conductor placed inside a metal tube functioning as the outer shield is called a
- A.
Flexible coaxial cable.
- B.
Rigid coaxial cable.
- C.
Waveguide.
- D.
Twin lead.
Correct Answer
B. Rigid coaxial cable. -
- 7.
(203) Which selection best describes the term “cutoff frequency” when discussing transmission line properties?
- 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.
Correct Answer
B. The frequency where XC causes the signal to be shunted. -
- 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.
Correct Answer
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.
Correct Answer
B. 8.33 wavelengths. -
- 10.
(203) A non-resonant 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 voltage across its shorted termination.
Correct Answer
B. Having no reflected waves. -
- 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 non-resonant.
Correct Answer
A. Current is at maximum and voltage at minimum at the termination. -
- 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.
Correct Answer
A. Antenna. -
- 13.
(204) The concept that alternating 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.
Correct Answer
C. What makes radio transmission possible. -
- 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.
Correct Answer
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.
Correct Answer
C. Transmit right hand and receive left 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.
Correct Answer
B. Standing wave ratio. -
- 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.
Correct Answer
C. Reciprocity. -
- 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.
Correct Answer
B. Isotropic 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.
Correct Answer
A. Impedance matching. -
- 20.
(207) Which antenna radiates radio energy in a circular pattern?
- A.
Omnidirectional.
- B.
Unidirectional.
- C.
Bidirectional.
- D.
Directional.
Correct Answer
A. Omnidirectional. -
- 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.
Correct Answer
B. Unidirectional. -
- 22.
(208) 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.
Correct Answer
B. Hertz antenna. -
- 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.
Correct Answer
A. Length. -
- 24.
(209) All antennas used in satellite communications are designed to be
- A.
Circular directional.
- B.
Omnidirectional.
- C.
Bidirectional.
- D.
Directional.
Correct Answer
D. Directional. -
- 25.
(209) A common satellite antenna is the
- A.
Whip.
- B.
Discone.
- C.
Parabolic.
- D.
Long-wire.
Correct Answer
C. Parabolic. -
- 26.
(209) A helical antenna radiates a signal with what type of polarization?
- A.
Horizontal.
- B.
Vertical.
- C.
Circular.
- D.
Linear.
Correct Answer
C. Circular. -
- 27.
(210) Aircraft antennas are housed
- A.
Inside non-conductive radomes mounted outside or flush with the fuselage.
- B.
Inside conductive radomes mounted outside or flush with the fuselage.
- C.
Outside non-conductive radomes mounted outside the fuselage.
- D.
Inside conductive radomes mounted flush with the fuselage.
Correct Answer
A. Inside non-conductive radomes mounted outside or flush with the fuselage. -
- 28.
(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?
- A.
90 and 180 degrees.
- B.
60 and 90 degrees.
- C.
30 and 60 degrees.
- D.
5 and 30 degrees.
Correct Answer
D. 5 and 30 degrees. -
- 29.
(210) What determines an antenna’s location and orientation on the aircraft?
- A.
Antennas always require a 360° radiating pattern.
- B.
The type of aircraft propulsion and power system.
- C.
Antennas are always mounted on top of the fuselage.
- D.
Optimizing the antenna’s radiating pattern for its application.
Correct Answer
D. Optimizing the antenna’s radiating pattern for its application. -
- 30.
(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?
- A.
Fixed blade.
- B.
Conformal.
- C.
Probe tip.
- D.
Whip.
Correct Answer
B. Conformal. -
- 31.
(211) In selecting an antenna for a circuit, what is the first thing to look at?
- A.
Type of propagation.
- B.
Selecting the antenna.
- C.
Determine the distance.
- D.
Finding the operating frequency.
Correct Answer
D. Finding the operating frequency. -
- 32.
(212) Which object has the greatest effect on an antenna?
- A.
Sun.
- B.
Earth.
- C.
Operator.
- D.
Ionosphere.
Correct Answer
B. Earth. -
- 33.
(212) Where is the most challenging location for a radio frequency (RF) transmission systems technician to establish and operate a radio station from?
- A.
Amazon jungle.
- B.
North Pole.
- C.
Sahara desert.
- D.
Sierra Nevada mountains.
Correct Answer
A. Amazon jungle. -
- 34.
(212) With a mountain between you and the distant end, which antenna is more effective?
- A.
Whip.
- B.
Dipole.
- C.
Discone.
- D.
Near-vertical incidence skywave (NVIS).
Correct Answer
D. Near-vertical incidence skywave (NVIS). -
- 35.
(213) Direct waves are radio waves that travel
- A.
Long distances with few interruptions.
- B.
From point to point along the earth’s surface.
- C.
Through the air in a straight line.
- D.
No more than 20 miles to the receive antenna.
Correct Answer
C. Through the air in a straight line. -
- 36.
(213) Radio waves that travel near the earth’s surface are called
- A.
Earth waves.
- B.
Global waves.
- C.
Ground waves.
- D.
Terrestrial waves.
Correct Answer
C. Ground waves. -
- 37.
(213) Sky wave transmission is used for which type of communications?
- A.
Long distance.
- B.
Sub-terrestrial.
- C.
Atmospheric.
- D.
Line of sight.
Correct Answer
A. Long distance. -
- 38.
(214) The path that undergoes a 180° phase shift is a
- A.
Ground-reflected path.
- B.
Surface path.
- C.
Direct path.
- D.
Sky path.
Correct Answer
A. Ground-reflected path. -
- 39.
(214) Which gives sky wave propagation its ability to communicate beyond the optical line-ofsight (LOS)?
- A.
Refraction.
- B.
Reflection.
- C.
Earth’s conductivity.
- D.
Atmospheric charge.
Correct Answer
A. Refraction. -
- 40.
(214) Frequencies higher than the critical frequency are
- A.
Returned to earth.
- B.
Passed into space.
- C.
The most desirable.
- D.
Refracted by the F2 layer.
Correct Answer
B. Passed into space. -
- 41.
(214) In high frequency (HF) communications, the lowest frequency that arrives at the distant receiver on 90 percent of the undisturbed days of the month is called the
- A.
Maximum usable frequency ( MUF).
- B.
Lowest usable frequency (LUF).
- C.
Operating frequency.
- D.
Critical frequency.
Correct Answer
B. Lowest usable frequency (LUF). -
- 42.
(214) The abbreviation FOT is derived from the term
- A.
Outbound traffic frequency.
- B.
Optimum tropospheric frequency.
- C.
Frequency of optimum transmission.
- D.
Frequency of outbound transmission.
Correct Answer
C. Frequency of optimum transmission. -
- 43.
(214) Magneton splitting creates two waves called
- A.
Direct and indirect.
- B.
Ordinary and abnormal.
- C.
In-phase and out-of-phase.
- D.
Ordinary and extraordinary.
Correct Answer
D. Ordinary and extraordinary. -
- 44.
(214) What occurs when a transmitted signal travels over two or more separate paths during transmission?
- A.
Skip effects.
- B.
Modulation.
- C.
Multipathing.
- D.
Magneton splitting.
Correct Answer
C. Multipathing. -
- 45.
(215) What is the recombination process dependent upon?
- A.
Season.
- B.
Time of day.
- C.
Regular variation.
- D.
Irregular variations.
Correct Answer
B. Time of day. -
- 46.
(215) Which layer of the ionosphere is most important to high frequency (HF) communications?
- A.
D
- B.
E
- C.
F
- D.
Topside
Correct Answer
C. F -
- 47.
(215) During what season do we have the widest range of critical frequencies and less absorption of all frequencies?
- A.
Fall.
- B.
Winter.
- C.
Spring.
- D.
Summer.
Correct Answer
B. Winter. -
- 48.
(215) Sunspots are disturbances
- A.
In the sun’s atmosphere.
- B.
On the sun’s surface.
- C.
In the ionosphere.
- D.
Beneath the sun’s surface.
Correct Answer
B. On the sun’s surface. -
- 49.
(216) For communications purposes, the usable frequency spectrum ranges from
- A.
3 hertz (Hz) to 300 gigahertz (GHz+).
- B.
300 Hz to 300 GHz.
- C.
3000Hz to 3000 GHz.
- D.
30 megahertz (MHz) to 300 MHz.
Correct Answer
A. 3 hertz (Hz) to 300 gigahertz (GHz+). -
- 50.
(216) What U.S. government agency divides the radio frequency (RF) spectrum into different bands?
- A.
Federal Aviation Agency.
- B.
American National Standard Institute.
- C.
Federal Communications Commission.
- D.
Institute of Electrical & Electronics Engineers, Inc.
Correct Answer
C. Federal Communications Commission. -
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Jun 28, 2013Quiz Edited by
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Sep 19, 2011Quiz Created by
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