{"id":18154,"date":"2026-10-15T07:46:36","date_gmt":"2026-10-15T02:16:36","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=18154"},"modified":"2026-10-15T07:46:37","modified_gmt":"2026-10-15T02:16:37","slug":"ham-radio-exam-preparation-1b","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/ham-radio-exam-preparation-1b\/","title":{"rendered":"Ham Radio Exam Preparation &#8211; 1B"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/36rAmrGL7Ng?si=syLBREo5VioZ209L\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">I am compiling 50 brand-new questions covering new areas of the ASOC General Grade syllabus, including advanced electronics, additional Q-codes, propagation phenomena, and Indian regulations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ASOC General Grade MCQs &#8211; Part 1B<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">ASOC General Grade Exam Preparation &#8211; Part 2<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Part 1: Basic Electricity and Components<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>51. In a purely resistive AC circuit, what is the phase relationship between voltage and current?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Voltage leads current<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Current leads voltage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) They are in phase<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) They are 180 degrees out of phase<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> When an AC circuit has only pure resistance, the voltage and current waveforms rise and fall exactly together (in phase).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>52. Which instrument must be placed in series with a component to measure it accurately?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Voltmeter<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Ammeter<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Ohmmeter<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Wattmeter<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> An ammeter measures electrical current and must be placed in series so the current being measured flows directly through it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>53. What is the standard unit of electrical capacitance?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Henry<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Farad<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Ohm<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Coulomb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Capacitance, the ability of a component to store an electrical charge, is measured in Farads (F).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>54. Which factors determine the capacitance of a parallel-plate capacitor?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Applied voltage and current<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Area of the plates, distance between them, and the dielectric material<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Frequency and internal resistance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Temperature and atmospheric pressure<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Larger plates, closer spacing, and better dielectric materials all increase the capacitance of a capacitor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>55. What is the nominal voltage of a single, fully charged lead-acid battery cell?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) 1.2 Volts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) 1.5 Volts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) 2.1 Volts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) 12 Volts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A standard lead-acid cell provides approximately 2.1V. A &#8220;12-volt&#8221; car battery actually contains six of these cells in series.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>56. What is the primary purpose of a heat sink attached to a semiconductor transistor?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) To increase electrical resistance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) To prevent RF radiation leakage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) To safely dissipate excess heat<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) To ground the circuit<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Transistors generate heat during operation. A heat sink provides a large surface area to dissipate this heat into the surrounding air, preventing damage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>57. What term describes the opposition to alternating current (AC) flow caused by a capacitor or inductor?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Resistance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Reluctance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Reactance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Admittance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Reactance (measured in ohms) is how capacitors and inductors oppose the flow of AC, and its value changes with frequency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>58. If a circuit has a voltage of 10 Volts and a resistance of 5 Ohms, what is the power dissipated?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) 2 Watts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) 20 Watts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) 50 Watts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) 100 Watts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Using the power formula P = V\u00b2 \/ R, we get 10\u00b2 \/ 5, which equals 100 \/ 5 = 20 Watts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>59. What happens to the total inductance when two inductors are connected in series (assuming no mutual magnetic coupling)?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) It decreases<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) It halves<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) It adds together<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) It becomes zero<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Just like resistors in series, the total inductance of inductors in series is the sum of their individual values (L_total = L1 + L2).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>60. What component consists of two coils of wire wound on a common magnetic core, used to change AC voltage levels?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Transistor<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Relay<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Transformer<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Diode<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A transformer transfers electrical energy between two or more circuits through electromagnetic induction, allowing AC voltages to be stepped up or down.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Part 2: Radio Receivers and Transmitters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>61. What does the acronym &#8220;SDR&#8221; stand for in modern amateur radio?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Signal Direct Routing<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Software Defined Radio<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Standard Dipole Radiator<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Shortwave Digital Receiver<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> In an SDR, components that were traditionally implemented in hardware (like mixers, filters, and modulators) are instead implemented via software on a computer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>62. Which modulation technique varies the phase angle of the carrier wave in relation to the audio signal?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Amplitude Modulation (AM)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Frequency Modulation (FM)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Phase Modulation (PM)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Single Sideband (SSB)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> PM alters the phase of the carrier. It is very closely related to FM and is often used in digital modes and some VHF radios.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>63. What is the main function of a &#8220;detector&#8221; stage in an AM receiver?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) To amplify the RF signal<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) To filter out adjacent frequencies<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) To extract the audio information from the RF carrier<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) To generate the local oscillator frequency<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> The detector (or demodulator) acts as a rectifier and filter, stripping away the high-frequency RF carrier to leave only the original audio waveform.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>64. What is a &#8220;parasitic oscillation&#8221; in a transmitter?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) An intended test signal<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Unwanted, self-generated oscillation at an unintended frequency<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) The main carrier frequency<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) The audio tone used for CW<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Parasitic oscillations are spurious RF emissions generated within an amplifier stage. They waste power and cause severe interference.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>65. What does the &#8220;ALC&#8221; circuit do in an RF transmitter?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Amplifies Low Current<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Automatically Logs Contacts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Automatic Level Control to prevent over-driving the amplifier<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Adjusts Local Carrier<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> ALC monitors the output and automatically reduces the transmitter gain if it gets too high, preventing signal distortion and splatter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>66. What is the primary use of a Variable Frequency Oscillator (VFO)?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) To tune the transceiver to different operating frequencies<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) To generate high voltage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) To decode digital signals<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) To measure SWR<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A VFO allows an operator to continuously tune their radio across a band, unlike crystal oscillators which are fixed to one frequency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>67. What is a distinct advantage of using a piezoelectric crystal oscillator?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) It can be tuned across a wide frequency range<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Extremely high frequency stability<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) It operates without a power supply<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) It emits absolutely no harmonics<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Quartz crystals vibrate at very precise frequencies, making crystal oscillators highly stable against temperature and voltage variations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>68. In a Single Sideband (SSB) transmission, what happens to the carrier wave?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) It is amplified to maximum power<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) It is suppressed\/eliminated<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) It is frequency modulated<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) It is split into two phases<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> SSB removes both the redundant sideband and the carrier wave entirely at the transmitter, saving power and bandwidth.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>69. By amateur radio convention, which sideband is primarily used for voice communications on the 20-meter band (14 MHz)?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Lower Sideband (LSB)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Upper Sideband (USB)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Double Sideband (DSB)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Independent Sideband (ISB)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> By international convention, amateurs use USB for bands at 14 MHz and above, and LSB for bands below 10 MHz.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>70. By convention, which sideband is primarily used on the 40-meter band (7 MHz)?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Lower Sideband (LSB)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Upper Sideband (USB)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Amplitude Modulation (AM)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Frequency Modulation (FM)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Because 7 MHz is below 10 MHz, the standard convention is to operate using Lower Sideband (LSB).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>71. What does the term &#8220;CW&#8221; signify in amateur radio communications?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Continuous Wave, typically used for Morse code<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Carrier Wavelength<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Clear Weather propagation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Contact Worked<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> CW refers to an unmodulated continuous RF wave being turned on and off to transmit Morse code (Emission type A1A).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>72. What is a &#8220;pileup&#8221; in amateur radio?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) A stack of old logbooks<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Multiple stations calling a single station simultaneously<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) A multi-element antenna<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) A battery pack series<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A pileup occurs when a rare or highly sought-after station (DX) transmits, and many operators try to answer them at the exact same time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>73. What is the purpose of a &#8220;notch filter&#8221; in a communications receiver?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) To remove a very specific, narrow interfering tone or carrier<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) To widen the audio bandwidth for hi-fi sound<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) To boost the bass frequencies<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) To completely mute the receiver<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A notch filter creates a sharp &#8220;notch&#8221; in the receiver&#8217;s passband, allowing the operator to eliminate an annoying continuous whistle or tone without affecting the rest of the voice signal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>74. What is &#8220;cross-modulation&#8221;?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Sending Morse code over an FM repeater<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Interference where the modulation of a strong unwanted signal transfers to the desired signal<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Changing bands quickly<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Bouncing signals off the moon<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Cross-modulation occurs when a very strong local signal overloads a receiver&#8217;s front end, causing its audio to superimpose itself onto the weak station you are trying to hear.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>75. Which component acts as a variable resistor and is typically used for volume controls?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Thermistor<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Potentiometer<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Capacitor<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Inductor<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A potentiometer (or &#8220;pot&#8221;) features a resistive track and a wiper that moves across it to vary resistance, commonly used for volume and tuning knobs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Part 3: Antennas and Propagation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>76. What is the standard characteristic impedance of coaxial cable used in amateur radio installations?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) 300 ohms<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) 75 ohms<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) 50 ohms<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) 600 ohms<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Almost all modern amateur radio transceivers and antennas are designed to interface with 50-ohm coaxial cable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>77. What happens to the transmission line loss if water enters the inside of a coaxial cable?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Loss decreases<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Loss increases significantly<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) The cable becomes an amplifier<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) SWR drops to 1:1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Water acts as a dielectric contaminant. It severely alters the cable&#8217;s impedance and absorbs RF energy, leading to massive signal attenuation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>78. What determines the &#8220;polarization&#8221; of an antenna&#8217;s radio wave?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) The type of feedline used<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) The orientation of the electric field relative to the earth<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) The frequency of transmission<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) The geographical location<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Polarization is defined by the plane of the electric field. A horizontally mounted wire dipole produces horizontally polarized waves; a vertical whip produces vertically polarized waves.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>79. A vertical ground-plane antenna typically exhibits what kind of radiation pattern?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Figure-eight<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Unidirectional<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Omnidirectional<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Highly directional beam<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A vertical antenna radiates RF energy equally in all horizontal directions (omnidirectional), making it ideal for local VHF\/UHF repeater communications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>80. What type of antenna is a &#8220;Yagi-Uda&#8221;?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) An isotropic radiator<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) A directional beam antenna with a driven element and parasitic elements<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) A simple wire dipole<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) A random wire antenna<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Usually just called a &#8220;Yagi,&#8221; this is a highly directional antenna utilizing a driven element, a reflector, and one or more directors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>81. In a Yagi antenna, what is the role of a &#8220;director&#8221; element?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) It connects directly to the coax<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) It reflects the signal backward<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) It helps focus RF energy in the forward direction<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) It grounds the antenna<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Directors are parasitic elements placed in front of the driven element. They are slightly shorter than the driven element and focus the signal forward.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>82. What is the phenomenon where a radio wave bends as it passes through regions of the ionosphere?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Reflection<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Refraction<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Diffraction<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Absorption<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Skywave propagation is actually caused by the ionosphere <em>refracting<\/em> (bending) the radio waves back toward the earth, though it is commonly referred to as &#8220;reflection.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>83. What effect does a high Solar Flux Index (SFI) generally have on HF propagation?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) It degrades all HF communications<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) It causes a complete radio blackout<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) It improves propagation on higher HF bands (e.g., 15m, 10m)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) It only affects VHF frequencies<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A high SFI indicates increased solar activity and ionization, which drastically improves the ability of higher HF bands to refract off the ionosphere for global communication.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>84. Which atmospheric layer is closest to the Earth and influences VHF\/UHF propagation via weather phenomena?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Troposphere<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Stratosphere<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Ionosphere<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Exosphere<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> The troposphere contains our weather. Temperature and humidity changes here can affect VHF and UHF signals, but have little effect on HF.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>85. What is &#8220;tropospheric ducting&#8221;?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Routing antenna cables through PVC pipes<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Extended VHF\/UHF propagation range caused by temperature inversions in the lower atmosphere<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Bouncing signals off satellites<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Lightning static<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> A temperature inversion can create a &#8220;duct&#8221; in the troposphere that traps VHF\/UHF signals and carries them hundreds of miles beyond the normal line-of-sight horizon.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>86. What is the approximate velocity of electromagnetic radio waves in a vacuum?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) 343 meters per second<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) 100,000 km per second<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) 300,000 km per second<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) 3,000 km per second<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Radio waves are a form of electromagnetic radiation and travel at the speed of light: roughly 300,000 kilometers per second.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>87. If an antenna has a gain of 3 dB over a standard dipole, what is the effective power multiplier?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) It halves the power<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) It doubles the effective radiated power<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) It triples the power<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) It multiplies power by 10<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Every 3 dB of gain represents a doubling of effective radiated power. Therefore, 100W fed into a 3 dB gain antenna performs like 200W from a standard dipole.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>88. What type of transmission line consists of two parallel wires separated by insulating spacers?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Coaxial cable<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Waveguide<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Open-wire line (ladder line)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Fiber optic cable<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Ladder line is a balanced transmission line that offers extremely low loss at HF frequencies, even when operating with high SWR.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Part 4: Radio Regulations and Operating Procedures (Indian Context)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>89. In the standard ITU phonetic alphabet, what word is used for the letter &#8220;A&#8221;?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Apple<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Alpha<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) America<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Antenna<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> The ITU standard phonetic alphabet is universally used in aviation, maritime, and amateur radio to ensure clear spelling. &#8216;A&#8217; is Alpha.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>90. Under ASOC rules, which of the following is strictly prohibited on amateur radio bands?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Morse code<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) International communications<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Broadcasting music and commercial advertisements<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Technical discussions<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Amateur radio is strictly for non-commercial use, technical investigation, and personal communication. Playing music or advertising is illegal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>91. What is the best practice before transmitting on any frequency?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Turn power to maximum<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Listen to ensure the frequency is not already in use<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Shout &#8220;CQ&#8221; immediately<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Tune the antenna tuner while transmitting at full power<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Always listen first, and then ask &#8220;Is this frequency in use?&#8221; to prevent interfering with an ongoing contact.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>92. Which Q-code is used to ask &#8220;Are you busy?&#8221; or to indicate &#8220;The frequency is busy&#8221;?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) QRM<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) QSY<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) QRL<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) QRZ<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Transmitting &#8220;QRL?&#8221; asks if the frequency is in use. If a station replies &#8220;QRL&#8221;, it means they are busy using the frequency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>93. Which Q-code is used to report &#8220;Your signals are fading&#8221;?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) QSB<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) QRN<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) QRT<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) QSO<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> QSB refers to signal fading, often caused by shifting ionospheric propagation conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>94. If a CW operator sends &#8220;QRS&#8221;, what are they requesting?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Send faster<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Send more slowly<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Stop sending<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Change frequency<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> QRS means &#8220;Please send more slowly.&#8221; It is good etiquette to match the speed of the operator who is sending to you, especially if they request QRS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>95. What Q-code means &#8220;I am ready&#8221; or &#8220;I am ready to receive your message&#8221;?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) QRV<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) QTH<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) QRM<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) QSL<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> QRV means the station is set up, operators are present, and they are ready to communicate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>96. What does the abbreviation &#8220;DX&#8221; stand for in amateur radio?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Diagnostics<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Duplex operation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Long distance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Digital transmission<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> DX historically stands for &#8220;distance.&#8221; On HF bands, it usually refers to contacting foreign countries or continents.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>97. In an emergency, what is the globally recognized voice distress signal?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) HELP<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) EMERGENCY<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) MAYDAY<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) PAN-PAN<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Derived from the French &#8220;m&#8217;aider&#8221; (help me), MAYDAY is the highest priority voice distress call, indicating imminent danger to life or vessel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>98. What is the standard Morse code (CW) equivalent of the Mayday distress signal?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) CQD<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) SOS<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) XXX<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) OSO<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> SOS (&#8230; &#8212; &#8230;) is universally recognized as the Morse code distress signal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>99. Are amateur radio operators permitted to use secret codes or encrypted ciphers to hide the meaning of their transmissions?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Yes, for personal privacy<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Yes, if communicating with another country<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) No, all transmissions must be in plain language or recognized Q-codes<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Only on digital modes<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Transparency is a core rule of amateur radio. Encryption or obscuring the meaning of messages is expressly forbidden by ASOC rules.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>100. In India, what is the legal status of an amateur radio station communicating with a non-amateur<\/strong> <strong>station?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) Allowed anytime<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) Strictly prohibited, except in declared emergencies<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) Allowed on weekends<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) Allowed if power is below 10 Watts<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Answer:<\/strong> B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Explanation:<\/strong> Amateurs are only permitted to communicate with other licensed amateur stations, except when assisting during declared life-threatening emergencies or disasters. Only on amateur frequencies, not on other bands.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I am compiling 50 brand-new questions covering new areas of the ASOC General Grade syllabus, including advanced electronics, additional Q-codes, propagation phenomena, and Indian regulations. ASOC General Grade MCQs &#8211; Part 1B ASOC General Grade Exam Preparation &#8211; Part 2 Part 1: Basic Electricity and Components 51. In a purely resistive AC circuit, what is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":18164,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-18154","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ham Radio Exam Preparation - 1B - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/ham-radio-exam-preparation-1b\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ham Radio Exam Preparation - 1B - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"I am compiling 50 brand-new questions covering new areas of the ASOC General Grade syllabus, including advanced electronics, additional Q-codes, propagation phenomena, and Indian regulations. ASOC General Grade MCQs &#8211; Part 1B ASOC General Grade Exam Preparation &#8211; Part 2 Part 1: Basic Electricity and Components 51. 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