FCC Technician Exam Question Pool. Subelement 3AI. Antennas and Feed Lines. 3 Questions. -------------------------------------------------- 3I 1.1 D What antenna type best strengthens signals from a particular direction while attenuating those from other directions? A. A Monopole antenna. B. An Isotropic antenna. C. A Vertical antenna. D. A Beam antenna. 3I 1.2 C What is a YAGI Antenna? A. Half Wavelength elements stacked vertically and excited in phase. B. Quarter Wavelength elements arranged horizontally and excited out of phase. C. Half Wavelength linear driven element(s) with parasitically excited parallel linear elements. D. Quarter Wavelength, triangular loop elements. 3I 1.4 A What is the general configuration of the radiating elements of a horizontally polarized Yagi? A. Two or more straight, parallel elements arranged in the same horizontal plane. B. Vertically stacked square or circular loops arranged in parallel horizontal planes. C. Two or more wire loops arranged in parallel vertical planes. D. A vertical radiator arranged in the center of an effective RF ground plane. 3I 1.5 D What type of Parasitic Beam Antenna uses two or more straight metal tubing elements arranged physically parallel to each other? A. A Quad Antenna. B. A Delta Loop Antenna. C. A Zepp Antenna. D. A Yagi Antenna. 3I 1.6 B How many directly driven elements does a Yagi Antenna have? A. None; they are all parasitic. B. One. C. Two. D. All elements are directly driven. 3I 1.8 A What is PARASITIC BEAM ANTENNA? A. An antenna where the director and reflector elements receive their RF excitation by induction or radiation from the driven elements. B. An antenna where wave traps are used to assure mawnetic coupling among the elements. C. An antenna where all elements are driven by direct connection to the feed line. D. An antenna where the driven element receives its RF excitation by induction or radiation from the driven elements. 3I 2.2 B What kind of antenna array is composed of a Square Full Wave Closed Loop Driven Element with Parallel Parasitic Element(s)? A. Dual Rhombic. B. Cubical Quad. C. Stacked Yagi. D. Delta Loop. 3I 2.3 D Approximately how long is one side of the driven element of a Cubical Quad Antenna? A. 2 electrical wavelengths. B. 1 electrical wavelength. C. 1/2 electrical wavelength. D. 1/4 electrical wavelength. 3I 2.4 C Approximately how long is the wire in the driven element of a Cubical Quad Antenna? A. 1/4 electrical wavelength. B. 1/2 electrical wavelength. C. 1 electrical wavelength. D. 2 electrical wavelengths. 3I 2.5 A What is a DELTA LOOP ANTENNA? A. A variation of the Quad Antenna with triangular elements. B. A large copper ring used direction finding. C. An antenna system composed of three Vertical Antennas arranged in a triangular shape. D. An antenna made from several coils of wire on an insulating form. 3I 2.6 B What is a QUBICAL QUAD ANTENNA? A. Four parallel metal tubes, each approximately 1/2 electrical wavelength long. B. Two or more parallel four sided wire loops, each approximately one electrical wavelength long. C. A vertical conductor 1/4 electrical wavelength high, fed at the bottom. D. A center fed wire 1/2 electrical wavelength long. 3I 4.1 D What is the polarization of electromagnetic waves radiated from a Half Wavelength Antenna mounted perpendicular to the Earth's surface? A. Circularly polarized waves. B. Horizontally polarized waves. C. Parabolically polarized waves. D. Vertically polarized waves. 3I 4.2 B What is the electromagnetic wave polarization of most Man Made Noise in the HF/VHF spectrum? A. Left Hand Circular. B. Vertically. C. Right Hand Circular. D. Horizontally. 3I 4.3 C To what does the term VERTICAL as applied to Wave Polarization refer? A. This means that the electric lines of force in the radio wave are parallel to the Earth's surface. B. This means that the magnetic lines of force in the radio wave are perpendicular to the Earth's surface. C. This means that the electric lines of force in the radio wave are perpendicular to the Earth's surface. D. This means that the radio wave will leave the antenna and radiate Vertically into the Ionosphere. 3I 4.4 B To what does the term HORIZONTAL as applied to Wave Polarization refer? A. This means that the magnetic lines of force in the radio wave are parallel to the Earth's surface. B. This means that the electric lines of force in the radio wave are parallel to the Earth's surface. C. This means that the electric lines of force in the radio wave are perpendicular to the Earth's surface. D. This means that the radio wave will leave the antenna and radiate Horizontally to the destination. 3I 4.5 B What electromagnetic wave polarization does a Cubical Quad Antenna have when the feedpoint is in the center of a horizontal side? A. Vertical. B. Horizontal. C. Circular. D. Helical. 3I 4.6 A What electromagnetic wave polarization does a Cubical Quad Antenna have when the feedpoint is in the center of a vertical side? A. Vertical. B. Horizontal. C. Circular. D. Helical. 3I 4.7 B What electromagnetic polarization does a Cubical Quad Antenna have when all sides are at 45 degrees to the Earth's surface and the feedpoint is at the bottom corner? A. Vertical. B. Horizontal. C. Circular. D. Helical. 3I 4.8 A What electromagnetic polarization does a Cubical Quad Antenna have when all sides are at 45 degrees to the Earth's surface and the feedpoint is at a side corner? A. Vertical. B. Horizontal. C. Circular. D. Helical. 3I 6.7 D What is a DIRECTIONAL ANTENNA? A. An antenna whose parasitic elements are all constructed to be directors. B. An antenna that radiates in direct Line of Sight propagation, but not skywave or skip propagation. C. An antenna permanently mounted so as to radiate in only one direction. D. An antenna that radiates more strongly in some directions than others. 3I 8.1 D What is meant by the term STANDING WAVE RATIO? A. The ratio of forward and reflected inductance on a feed line. B. The ratio of forward and reflected resistances on a feed line. C. The ratio of forward and reflected impedances on a feed line. D. The ratio of forward and reflected voltages on a feed line. 3I 8.2 A What is meant by the term FORWARD POWER? A. The power traveling from the transmitter to the antenna. B. The power radiated from the front of the antenna. C. The power produced during the positive half of the RF cycle. D. The power used to drive a linear apmlifier. 3I 8.3 B What is meant by the term REFLECTED POWER? A. The power radiated from the back of the antenna. B. The power returned to the transmitter from the antenna. C. The power produced during the negative half of the RF cycle. D. The power reflected to the transmitter site by buildings and trees. 3I 9.1 A What is STANDING WAVE RATIO a measure of? A. The ratio of maximum to minimum voltage on a line. B. The ratio of maximum to minimum reactance on a line. C. The ratio of maximum to minimum resistance on a line. D. The ratio of maximum to minimum sidebands on a line. 3I 9.2 D What happens to the power loss in an unbalanced feed line as the Standing Wave Ratio increases? A. It is unpredictable. B. It becomes nonexistent. C. It decreases. D. It increases. 3I 10.1 D What is a BALANCED LINE? A. Feed line with one conductor connected to ground. B. Feed line with both conductors connected to ground to balance out harmonics. C. Feed line with the outer conductor connected to ground at even intervals D. Feed line with neither conductor connected to ground. 3I 10.2 B What is a BALANCED ANTENNA? A. A symetrical antenna with one side of the feedpoint connected to ground. B. An antenna (or a driven element in an array) that is symetrical about the feed point. C. A symetrical antenna with both sides of the feed point connected to ground to balance out harmonics. D. An antenna designed to be mounted in the center. 3I 10.3 C What is an UNBALANCED LINE? A. Feed line with neither conductor connected to ground. B. Feed line with both conductors connected to ground to balance out harmonics. C. Feed line with one conductor connected to ground. D. Feed line with the outer conductor connected to ground at uneven intervals 3I 10.4 A What is an UNBALANCED ANTENNA? A. An antenna (or a driven element in an array) that is not symetrical about the feed point. B. A symetrical antenna having neither half connected to ground. C. An antenna (or a driven element in an array) that is symetrical about the feed point. D. A symetrical antenna with both halves coupled to ground at uneven intervals to balance out harmonics. 3I 11.3 D What type of feed line is best suited to operating at a high Standing Wave Ratio? A. Coaxial cable. B. Twisted pair. C. Flat ribbon "Twin Lead." D. Parallel Open Wire Line. 3I 11.5 B What is the general relationship between frequencies passing through a Feed Line and the losses in the Feed Line? A. Loss is independent of frequency. B. Loss increases with increasing frequency. C. Loss decreases with increasing frequency. D. There is no predictable relationship. 3I 11.6 C What happens to RF energy not delivered to the antenna by a lossy Coaxial Feed Line? A. It is radiated by the feed line. B. It is returned to the transmitter's chassis ground. C. Some of it is dissipated as heat in the conductors and dielectric. D. It is canceled because of the voltage ratio of forward power to reflected power in the feed line. 3I 11.9 A As the operating frequency decreases, what happens to conductor losses in a feed line? A. The losses decreases. B. The losses increases. C. The losses remains the same. D. The losses become infinite. 3I 11.11 B As operating frequency increases, what happens to conductor losses in a feed line? A. The losses decreases. B. The losses increase. C. The losses remains the same. D. The losses decreases to zero. 3I 12.3 D What device can be installed on a Balanced Antenna so that it can be fed through a Coaxial Cable? A. A triaxial transformer. B. A wavetrap. C. A loading Coil. D. A balun. 3I 12.4 B What is a BALUN? A. A device that can be used to convert an antenna designed to be fed at the center so that it may be fed at one end. B. A device that may be installed on a Balanced Antenna so that it may be fed with unbalanced feed line. C. A device that can be installed on an antenna to produce Horizontally Polarized or Vertically Polarized waves. D. A device used to allow an antenna to operate on more than one band. -------------------------------------------------- End of Subelement 3AI.