FCC Novice Exam Question Pool. Subelement 2I. Antennas and Feed Lines. 3 Questions. One (1) question must be from the following: ------------------------------------------------ 2I 1.1 A What is the approximate length of a Half-Wave Dipole antenna for 3725 kHz? A. 126 ft. B. 81 ft. C. 63 ft. D. 40 ft. 2I 1.2 D What is the approximate length of a Half-Wave Dipole antenna for 7125 kHz? A. 84 ft. B. 42 ft. C. 33 ft. D. 66 ft. 2I 1.3 C What is the approximate length of a Half-Wave Dipole antenna for 21,125 kHz? A. 44 ft. B. 28 ft. C. 22 ft. D. 14 ft. 2I 1.4 C What is the approximate length of a Half-Wave Dipole antenna for 28,150 kHz? A. 22 ft. B. 11 ft. C. 17 ft. D. 34 ft. 2I 1.5 D How is the approximate length of a Half-Wave Dipole antenna calculated? A. By substituting the desired operating frequency for f in the formula : 150/f (MHz.) B. By substituting the desired operating frequency for f in the formula : 234/f (MHz.) C. By substituting the desired operating frequency for f in the formula : 300/f (MHz.) D. By substituting the desired operating frequency for f in the formula : 468/f (MHz.) 2I 2.1 D What is the approximate length of a Quarter-Wave Vertical antenna adjusted to resonate at 3725 kHz.? A. 20 ft. B. 32 ft. C. 40 ft. D. 63 ft. 2I 2.2 D What is the approximate length of a Quarter-Wave Vertical antenna adjusted to resonate at 7125 kHz.? A. 11 ft. B. 16 ft. C. 21 ft. D. 33 ft. 2I 2.3 B What is the approximate length of a Quarter-Wave Vertical antenna adjusted to resonate at 21,125 kHz.? A. 7 ft. B. 11 ft. C. 14 ft. D. 22 ft. 2I 2.4 B What is the approximate length of a Quarter-Wave Vertical antenna adjusted to resonate at 28,150 kHz.? A. 5 ft. B. 8 ft. C. 11 ft. D. 16 ft. 2I 2.5 A When a vertical antenna is lengthened, what happens to its resonant frequency? A. It decreases. B. It increases. C. It stays the same. D. It doubles. 2I 2.6 C What is the approximate length (in inches) of a 5/8 Wavelength Vertical antenna for the 220 MHz. band? A. 19.5 Inches. B. 22 Inches. C. 28.5 Inches D. 32 Inches. 2I 2.7 B Why do many Amateurs use a 5/8 Wavelength Vertical Antenna rather that a 1/4 Wavelength Antenna for their VHF of UHF mobile stations? A. A 5/8 Wavelength Antenna can handle more power than a 1/4 Wavelength antenna. B. A 5/8 Wavelength Antenna has more gain than a 1/4 Wavelength antenna. C. A 5/8 Wavelength Antenna exhibits less corona loss than a 1/4 Wavelength antenna. D. A 5/8 Wavelength Antenna looks more like a CB Antenna, so it does not attract as much attention as a 1/4 Wavelength Antenna. One (1) question must be from the following: ------------------------------------------------ 2I 3.1 D What is COAXIAL CABLE? A. Two parallel conductors encased along the edges of a flat plastic ribbon. B. Two parallel conductors held at a fixed distance from each other by insulating rods. C. Two conductors twisted around each other in a double spiral. D. A center conductor encased in insulating material which is covered by a conducting sleeve or shield and encased in a weatherproof jacket. 2I 3.2 B What kind of antenna feed line is constructed of a center conductor encased in insulation which is then covered by an outer conducting shield and weatherproof jacket? A. Twin Lead. B. Coaxial Cable. C. Open-Wire Feed Line. D. Waveguide. 2I 3.3 B What are some advantages in using Coaxial Cable as an antenna feed line? A. It is easy to make at home, and it has a characteristic impedance in the range of most common amateur antennas. B. It is weatherproof, and it has a characteristic impedance in the range of most common amateur antennas. C. It can be operated at a higher SWR than twin lead, and is weatherproof. D. It is unaffected by nearby metallic objects, and has a characteristic impedance that is higher than twin lead. 2I 3.4 B What commonly available antenna feed line can be buried directly in the ground for some distance without adverse effects? A. Twin Lead. B. Coaxial Cable. C. Parallel Conductor. D. Twisted Pair. 2I 3.5 C When an antenna feed line must be located near grounded metal objects, which commonly available feed line should be used? A. Twisted Pair. B. Twin Lead. C. Coaxial Cable. D. Ladder Line. 2I 4.1 B What is Parallel Conductor Feed Line? A. Two conductors twisted around each other in a double spiral. B. Two parallel conductors held a uniform distance apart by insulating material. C. A conductor encased in insulating material which is then covered by a conducting shield and a weatherproof jacket. D. A metallic pipe whose diameter is equal to or slightly greater than the wavelength of the signal being carried. 2I 4.2 C How can TV TYPE TWIN LEAD be used as a feed line? A. By carefully running the feed line parallel to a metal post to insure self resonance. B. TV Type Twin Lead can not be used in an Amateur Radio Station. C. By installing an impedance matching network between the transmitter and the feed line. D. By using a high power amplifier and installing a power attenuator between the transmitter ad feed line. 2I 4.3 D What are some advantages of using Parallel Conductor Feed Line? A. It has a lower characteristic impedance than coaxial cable and will operate at a higher SWR than coaxial cable. B. It will operate at a higher SWR than coaxial cable and it is unaffected by nearby metal objects. C. It has a lower characteristic impedance than coaxial cable and has less loss than coaxial cable. D. It will operate at a higher SWR than coaxial cable and has less loss than coaxial cable. 2I 4.4 A What are some disadvantages in using parallel conductor feed line? A. It is affected by nearby metallic objects and it has a characteristic impedance that is too high for direct connection to most Amateur transmitters. B. It is more dificult to make at home than Coaxial Cable and it can not be operated at high SWR. C. It is affected by nearby metallic objects and it can not handle the power output of typical Amateur transmitters. D. It has a characteristic impedance that is too high for direct connection to most Amateur transmitters and it will operate at high SWR. 2I 4.5 B What kind of antenna feed line is constructed of two parallel conductors maintained a uniform distance apart by insulated spreaders? A. Coaxial Cable. B. Ladder Line open conductor line. C. Twin Lead in a plastic ribbon. D. Twisted Pair. One (1) question must be from the following: ------------------------------------------------ 2I 5.1 A What type of pattern is produced by a 5/8 Wavelength Vertical Antenna? A. A pattern with the transmitted signal spread out equally in all directions. B. A pattern with more of the signal concentrated in one direction than in other directions. C. A pattern with most of the transmitted signal concentrated in two opposite directions. D. A pattern with most of the transmitted signal concentrated at high radiation angles. 2I 6.1 B What type of pattern is produced by a YAGI Antenna? A. A pattern with the transmitted signal spread out equally in all directions. B. A pattern with more of the signal concentrated in one direction than in other directions. C. A pattern with most of the transmitted signal concentrated in two opposite directions. D. A pattern with most of the transmitted signal concentrated at high radiation angles. 2I 6.2 D On the Yagi Antenna show in Figure 2I-6, what is the name of section B ? A. Director. B. Reflector. C. Boom. D. Driven Element. 2I 6.3 A On the Yagi Antenna show in Figure 2I-6, what is the name of section C ? A. Director. B. Reflector. C. Boom. D. Driven Element. 2I 6.4 B On the Yagi Antenna show in Figure 2I-6, what is the name of section A ? A. Director. B. Reflector. C. Boom. D. Driven Element. 2I 6.5 C Approximately how long (in wavelengths) is the driven element of a YAGI Antenna? A. 1/4 Wavelength. B 1/3 Wavelength. C. 1/2 Wavelength. D. 1 Wavelength. ------------------------------------------------ End of Subelement 2I.