Federal Communications Commission (FCC) Element 3 Practice Test

These questions are part of the practice quiz. Start practicing

• Which modulation technique does SSB use?
• In a single-sideband phone signal, what determines the PEP-to-average power ratio?
• If a circuit has a time constant of 20 seconds, how long will it take to reach 63.2% of its maximum current?
• To lengthen an antenna electrically, which component should be added?
• In a series circuit, how do you calculate total resistance?
• What layer is responsible for handling error correction and data flow control?
• What is the principal function of a built-in self-test feature in communication transceivers?
• What is the maximum DC or RMS voltage that may be connected across a 20 watt, 2000 ohm resistor?
• After two time constants, to what percentage of the supply voltage is a capacitor in an RC circuit charged?
• What is a characteristic of a NOR gate?
• The permanent magnetic field surrounding a traveling-wave tube (TWT) serves to do what?
• When is a short pulse width most beneficial in a RADAR system?
• What does the term "night effect" refer to in relation to Automatic Direction Finding (ADF) equipment?
• What is meant by the term "back EMF"?
• What does an SWR meter measure?
• What type of filtering is typically used in audio processing to improve clarity?
• What is a common occurrence when voice-testing an SSB aboard a boat?
• What does the noise figure of a communications receiver indicate?
• Which component is essential in the Instrument Landing System (ILS)?
• What is the easiest voltage amplitude to measure on an oscilloscope when viewing a pure sine wave signal?
• Which frequency standard is commonly used as a time base standard by field technicians?
• Which component in a phase-locked loop is responsible for generating the error voltage?
• What are the three terminals of an SCR?
• What type of reception antenna is used for Very High Frequency Omnidirectional Range (VOR) and Localizer (LOC) installations on aircraft?
• Which of the following best describes the function of a local oscillator in a radio receiver?
• What is the function of a phase-locked loop (PLL) circuit?
• What is the effective radiated power of a repeater with a 50 watts transmitter output, considering 4 dB feedline loss, 3 dB duplexer and circulator loss, and 6 dB antenna gain?
• What is the time constant of a circuit with two 220-microfarad capacitors and two 1-megohm resistors in series?
• In microprocessor-controlled two-way radios, the "watchdog" timer serves what purpose?
• What is the primary purpose of a mode C transponder in aviation?
• In an FM-phone signal, what is the term for the maximum deviation from the carrier frequency divided by the maximum audio modulating frequency?
• What do the initials CMOS stand for?
• In rectangular coordinates, what is the impedance of a network composed of a 1.0-millihenry inductor in series with a 200-ohm resistor, at 30 kHz?
• Before conducting a ground test with an aircraft RADAR, what should the operator ensure?
• Which amplifier configuration provides more voltage gain than common emitter or common collector?
• A TDMA radio uses what to carry multiple conversations sequentially?
• At what radio stage is the image frequency typically rejected?
• Which of the following statements concerning satellite EPIRBs is true?
• What is true about the output of a NAND gate?
• How might an installer verify correct GPS sentence to a marine DSC VHF radio?
• In electrical terms, a transformer primarily functions to do what?
• What component in a transmission line contributes to the velocity factor?
• What happens when the resonant frequency of an antenna is increased?
• If a power supply has a full load voltage of 200 volts and a regulation of 25%, what is the no load voltage?
• What feature makes operational amplifiers suitable for filtering applications?
• How does the time constant affect the charging and discharging of capacitors in circuits?
• What would be the bandwidth of a good crystal lattice band-pass filter for weather facsimile HF reception?
• Which of the following statements about VOR stations is true?
• Which component has a higher efficiency at 400 Hz compared to 60 Hz in aviation systems?
• What is the conductance (G) of a circuit when 6 amperes of current flow with a 12 volts DC applied?
• Which amplifier typically has the lowest voltage gain among the common configurations?
• Which of the following statements about NAVTEX is true?
• What is the voltage drop across R1 if its value is 9 volts?
• What is a key characteristic of an inverting operational amplifier circuit?
• What is the principal characteristic of a tunnel diode?
• What is the distinguishing feature of a Class A amplifier?
• What type of wire would connect an SSB automatic tuner to an insulated backstay?
• The beta cutoff frequency of a bipolar transistor refers to the frequency at which?
• What does DAC stand for in microprocessor circuits?
• What is the total capacity required for a battery to run a 50W transmitter continuously for 6 hours with specified loads?
• What does DGPS stand for?
• What is the effective radiated power of a repeater with 100 watts transmitter power output and specified losses?
• If a current of 3 amperes flows through a resistor connected to 90 volts, what is the resistance?
• What does the term velocity factor of a transmission line refer to?
• What is a key function of a logic probe?
• In the seven-level reference model, which level arranges the bits into frames and controls data flow?
• Which class of amplifier is known for the highest linearity and least distortion?
• What does RAM stand for in semiconductor memory ICs?
• In coaxial cables, what is reflected power indicative of?
• What is the modulation index of a FM phone transmitter with a maximum carrier deviation of 6 kHz and a modulating frequency of 2 kHz?
• What is one advantage of using a trap antenna?
• What determines whether a NAVTEX receiver does not print a particular type of message content?
• What is the nominal output voltage of a fully charged nickel-cadmium battery?
• What does GFI stand for in electrical systems?
• What are the two most-used PCS coding techniques used to separate different calls?
• What device is typically used as a stable reference voltage in a linear voltage regulator?
• What is the process of detection in a radio diode detector circuit?
• A communications technician would perform a modulation-acceptance bandwidth test in order to:
• What stage of an oscilloscope determines the maximum frequency response?
• What class of amplifier is characterized by the bias set well beyond cutoff?
• What is a typical application of a hot-carrier diode?
• What is the impedance of a network with a 0.01-microfarad capacitor in parallel with a 300-ohm resistor, at 50 kHz?
• A nickel-cadmium cell has an operating voltage of about:
• What is meant by antenna bandwidth?
• How many logic levels does a TTL circuit operate with?
• What kind of input signal is used to test the amplitude linearity of a single-sideband phone transmitter?
• For a power supply with a no load voltage of 12 volts and a full load voltage of 10 volts, what is the percentage of voltage regulation?
• How should the signal from a Search And Rescue RADAR Transponder appear on a RADAR display?
• Which terminals are part of a bipolar transistor?
• Why are special precautions necessary in handling FET and CMOS devices?
• What is a "hot gas bonder" used for?
• What type of modulation is characterized by the variation of pulse duration?
• What is the carrier frequency for the marker beacon system used during an ILS approach?
• What is the output of an OR gate when both inputs are low?
• What is the best method to eliminate parasitic oscillations in a power amplifier?
• Which device acts as two SCRs connected back to back but facing in opposite directions?
• In a linear electronic voltage regulator, how is the conduction of a control element varied?
• What aspect of INMARSAT-C distinguishes it from other systems?
• What characteristic of a receiver is impacted by the selectivity of its IF circuitry?
• How can an installer verify correct GPS sentence to a marine DSC VHF radio?
• RADAR collision avoidance systems utilize inputs from each of the following except which device?
• What is the ideal method of removing insulation from wire?
• What does dB represent in the context of power losses in transmission lines?
• What is the term that identifies an AC voltage which produces the same heating effect in a resistor as a corresponding value of DC voltage?
• What is the function of a GFI electrical socket?
• At which position are the amplitude modulated variable phase signal and the frequency modulated reference phase signal of a VOR station in phase with each other?
• Which type of circuit component would be used to temporarily store electrical energy?
• What type of encoding is utilized in an aircraft's mode C transponder transmission?
• Which class of amplifier conducts for 180 degrees of the input wave?
• When an emergency transmitter uses 325 watts and a receiver uses 50 watts, how many hours can a 12.6 volt, 55 ampere-hour battery supply full power to both units?
• In which component is the energy stored in the form of an electrostatic field?
• In a circuit diagram, which labeled component is used to provide a signal ground?
• What resistance should be connected in series with a battery of 12.5 volts to trickle-charge it at a 0.5 A rate from a 110-V DC line?
• Which instrument is best suited for checking a TTL logic circuit?
• Which data language is described as bi-directional, multi-transmitter, and multi-receiver network?
• Which of the following quantities is measured in Amperes?
• What is a correct statement about the localizer beam system used during ILS approaches?
• What occurs to the conductivity of a photosensitive semiconductor junction when illuminated?
• What are the transmit and receive frequencies of an aircraft's mode C transponder?
• Which component is critical for tracking down electromagnetic interference (EMI)?
• What elements are combined in a time-domain reflectometer (TDR) to measure transmission line characteristics?
• What is the characteristic feature of a NAND gate?
• What type of modulation technique is known for varying the duration of the pulse to convey signal information?
• What is the time constant of a circuit with two 100-microfarad capacitors and two 470-kilohm resistors in parallel?
• What is an L-network composed of?
• How much gain should the RF amplifier stage provide?
• What is a primary use of time-division multiplexing in communications?
• What circuit interconnects the microprocessor with the memory and input/output system?
• If the elapsed time for a RADAR echo is 62 microseconds, what is the distance to the object in nautical miles?
• In a transformer, what does a higher winding turn count typically indicate about voltage?
• How is true power computed in a circuit where AC voltage and current are out of phase?
• What additional feature can a mode S transponder provide beyond basic transponder functionality?
• What is the digital signal processing term for noise subtraction circuitry?
• Which of the following can be a consequence of an improper impedance match in an antenna system?
• What describes a spread spectrum communications system altering the center frequency of a conventional carrier rapidly?
• What is characterized by the increased conductivity of an illuminated semiconductor junction?
• What is the proper way to cut plastic wire ties?
• Which of the following is NOT one of the major oscillator circuits found in radio equipment?
• Which statement about the Iridium system is true?
• In polar coordinates, what is the impedance of a network composed of a 100-picofarad capacitor in parallel with a 4000-ohm resistor, at 500 KHz?
• Which of the following best describes galvanic corrosion?
• Which of the following Ohm's Law formulas is incorrect?
• The pulse repetition rate (PRR) of a RADAR pertains to what aspect?
• In electrical terms, what does the term 'dielectric' refer to?
• How much can the actual transmitter frequency differ from a reading of 156,520,000 Hertz with an accuracy of +/- 10 ppm?
• What describes the primary use of DRAM?
• Which gate produces a logic "0" when both inputs are high?
• If the capacitance of an op-amp oscillator circuit were suddenly doubled, what would be the most noticeable effect?
• What is the primary function of a low noise amplifier in a VHF receiver?
• What is a characteristic of a NOT gate?
• Which is the code used for SITOR-A and -B transmissions?
• What type of radio transmitter is indicated by the block labeled 4 in a specific block diagram?
• In a pulse-position modulation system, what parameter does the modulating signal vary?
• What would a significant characteristic of an astable multivibrator be?
• At what aggregate power level is an MPE study required?
• How many revolutions per second does the VOR variable signal rotate?
• What kind of interference will a 13.345 MHz signal cause in a receiver mixing a 13.8 MHz VFO with a 14.255 MHz input?
• What is the main advantage of using an op-amp audio filter compared to a passive LC audio filter?
• The Distance Measuring Equipment (DME) indicates the distance from an aircraft to the DME ground station, commonly referred to as?
• Is it advisable to use a power drill without eye protection?
• How can even-order harmonics be reduced in a transmitter amplifier design?
• Where is the external feedback network connected in a closed-loop op-amp circuit to control the gain?
• Skin effect is the phenomenon where:
• What is the dynamic range of a receiver?
• In a pulse-width modulation system, what parameter does the modulating signal vary?
• What factors determine the capacitance of a capacitor?
• An electrical relay is a:
• What is the impedance of a 1.0-microfarad capacitor in series with a 500-ohm resistor at 100 kHz?
• An oscilloscope can be used for all of the following except:
• What is the frequency range of an aircraft's radio altimeter?
• Which of the following systems uses TDMA for its operations?
• How is the efficiency of a Class A amplifier typically characterized?
• What is the purpose of a low-pass filter in synthesizer circuits?
• How can an FM-phone signal be produced in a transmitter?
• What is the relative dielectric constant for air?
• What does the term "beta" represent in bipolar transistors?
• Which type of antenna is known to radiate signals equally from all horizontal directions?
• What is the optimal receiver selectivity in the IF circuitry for SSB voice signals?
• In rectangular coordinates, what is the impedance of a network composed of a 0.1-microhenry inductor in series with a 30-ohm resistor, at 5 MHz?
• What is the impedance expressed in polar coordinates of a series network consisting of a 200-ohm resistor and a 150-ohm-reactance inductor?
• What does the term "time constant" of an RC circuit specifically refer to?
• What is the typical orbit altitude of Global Positioning Service (GPS) satellites?
• What is an isolator in RF technology?
• What is the orbital altitude of INMARSAT satellites?
• What produces a magnetic field?
• What factor contributes to the ADF's ability to receive long-distance signals?
• What is the primary role of an RF amplifier in a receiver?
• What are the distinguishing features of a Chebyshev filter?
• An excited 1/2 wavelength antenna produces which types of fields?
• What would be the output voltage in a circuit given combined DC input voltages of -5.5 V?
• If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage across the resistor?
• Can a P25 radio system be monitored with a scanner?
• The output of a Class B amplifier is present for what portion of the input cycle?
• To produce a single-sideband suppressed carrier transmission, it is necessary to ____ the carrier and to ____ the unwanted sideband.
• A 12.6 volt, 8 ampere-hour battery is supplying power to a receiver that uses 50 watts and a RADAR system that uses 300 watts. How long will the battery last?
• In a positive-logic circuit, what is the typical output for a logic "0"?
• What does the DSP not do in a modern DSP radio?
• What is a critical factor in the operation of a DME system?
• What is the most important safety measure when repairing circuit board assemblies?
• What is the rectangular coordinate impedance of a network consisting of a 10-microhenry inductor and a 20-ohm resistor at 1 MHz?
• What is the normal range of pulse repetition rates for RADAR systems?
• What is facsimile in the context of communication?
• What are the distinguishing features of a Butterworth filter?
• Conductance takes place in a waveguide through what means?
• What is the function of the 1 μF capacitor connected to a potentiometer?
• What value of current-limiting resistor would appropriately bias a 1-watt, 10-volt Zener diode in a 20-V power supply?
• If a coaxial cable has 7 dB of reflected power when the input is 5 watts, what is the output of the transmission line?
• What is the maximum allowable voltage drop at the end of the last segment in NMEA 2000 wiring?
• What method is used to power an NMEA 2000 system with devices located in a single area?
• What will occur when a non-linear amplifier is used with a single-sideband phone transmitter?
• What happens if an amplifier input signal coupling capacitor fails open?
• What is the common method for determining the exact sensitivity specification of a receiver?
• If a 100-ohm resistor is connected across 200 volts, what is the current through the resistor?
• What is the typical output of the mixing process in a radio receiver?
• What kind of antenna is typically used in an aircraft's Instrument Landing System (ILS) marker beacon installation?
• How many individual memory cells are in an IC with 4 data bus I/O pins and 4 address pins?
• What is the approximate DC input power to a Class AB RF power amplifier stage when the PEP output is 500 watts?
• What is the maximum amount of information bits that can be stored in a single flip-flop?
• Which of the following statements concerning INMARSAT geostationary satellites is true?
• In a specific circuit, which lamps would be lit if the relevant circuit components were functioning properly?
• How many satellites need to be received to determine complete position and time?
• What input amplitude parameter is most valuable in evaluating a Class A amplifier?
• Which characteristic of a filter implies the ability to reduce unwanted signals?
• What pulse width and repetition rate should be used at short ranges for RADAR?
• What parameter must be selected when designing an audio filter using an op-amp?
• In a TTL device operating at 5.0 volts, what range is identified as valid logic high input?
• What characterizes spread spectrum communication?
• What does the pulse width (PW) in a RADAR system determine?
• Which network provides the greatest harmonic suppression?
• Which filter type is suitable for micro-miniature electronic circuits?
• Which of the following is the preferred method of cleaning solder from plated-through circuit-board holes?
• Which device is typically used to resolve issues in elevator circuit tachometers?
• What is a bistable multivibrator circuit commonly referred to as?
• Which circuit samples analog signals, processes them as numbers, then converts them back to analog?
• What are the two most commonly-used specifications for a junction diode?
• What type of antenna is used to extract the RADAR signal from the waveguide?
• If a marine radiotelephone receiver uses 75 watts of power and a transmitter uses 325 watts, how long can they both operate before discharging a 50 ampere-hour, 12 volt battery?
• What is the time constant of a circuit with two 100-microfarad capacitors and two 470-kilohm resistors in series?
• How should the filter bandwidth of a receiver's IF section be relative to the bandwidth of a received signal?
• What is the opposition to the creation of magnetic lines of force in a magnetic circuit called?
• What is the magnitude of the impedance in a series AC circuit with a resistance of 6 ohms and an inductive reactance of 17 ohms?
• What does cross-modulation interference refer to?
• What is the frequency range of the ground-based Very-high-frequency Omnidirectional Range (VOR) stations used for aircraft navigation?
• In the IF circuitry, how does a selectivity of 2.4 kHz benefit SSB voice signals?
• What do the initials TTL stand for?
• What kind of communication does SELCAL allow for with aircraft?
• What is the frequency range of the localizer beam system used in an Instrument Landing System (ILS)?
• Which component is essential for preventing strong signals from degrading weak signal reception?
• How does the output power of typical VHF transmitters compare to that of HF transmitters?
• Which instrument is used to check the signal quality of a single-sideband radio transmission?
• What does a synchro transmitter and receiver transmit?
• What does the term radiation resistance of an antenna refer to?
• At pi/3 radians, what is the amplitude of a sine wave with a peak value of 5 volts?
• A good crystal band-pass filter for a single-sideband phone would be?
• What type of spectral impurity components might be generated by a phase-locked-loop synthesizer?
• What type of bias is necessary for an LED to emit light?
• Which frequency band does the Iridium system use for telephone and messaging services?
• What method can be used to reduce the inductance of an antenna coil?
• What is one of the primary uses of a low-pass filter in radio applications?
• What type of signals are used to conduct an SSB two-tone test?
• What is the primary reason voltage can be greater across reactances in series than the applied voltage?
• What is the frequency range of an aircraft's Automatic Direction Finding (ADF) equipment?
• On an analog wattmeter, how accurate is the reading at full scale?
• What class of fire is caused by an electrical short circuit?
• At 240 degrees, what is the amplitude of a sine wave with a peak value of 5 volts?
• Why is nitrogen used in transmission lines?
• Which of the following best describes a pulse modulation system?
• What is the definition of detection in a radio receiver?
• Which device is used to store electrical energy in an electrostatic field?
• What is the impedance of a network composed of a 0.1-microhenry inductor in series with a 20-ohm resistor, at 30 MHz?
• What causes the SART to begin a transmission?
• What does compliance with MPE regulations help to ensure?
• In a resonant circuit, how are the current and voltage related?
• What term refers to the sequence of commands and instructions within a microprocessor?
• What is the typical operating current for a light-emitting diode?
• When measuring DC in a circuit, what should be expected with normal function?
• What is the power factor in an R-L circuit with a 30 degree phase angle between voltage and current?
• Which of the following ensures legal operation of a marine VHF DSC radio during emergencies?
• What is the second harmonic of an SSB frequency of 4146 kHz?
• If a transmission line has a power loss of 6 dB per 100 feet, how much power is available at the feed point of a 200 foot line fed by a 100 watt transmitter?
• What does the vertical axis of a spectrum analyzer display?
• According to U.S. Health Department regulations, exposure to microwave energy from RADAR is limited to _______ mW/centimeter.
• If a repeater has a 75 watts output with a combination of 5 dB feedline loss and 4 dB duplexer loss, while also considering 6 dB of antenna gain, what is its effective radiated power?
• What is the deviation ratio for an FM phone signal with a maximum frequency deviation of ±5 kHz and a maximum modulation rate of 3 kHz?
• Which of the following is NOT a precaution to ensure the magnetron is not weakened?
• What integrated circuit device converts an analog signal to a digital signal?
• What is the time constant of a circuit with a 220-microfarad capacitor and a 1-megohm resistor in parallel?
• What is the primary purpose of the final IF amplifier stage in a receiver?
• What is the main underlying operating principle of the VOR aircraft navigational system?
• What principle do stub lines utilize in transmission systems?
• Which component directly processes the CTCSS tone in an FM receiver?
• What is the significance of the carrier frequency in a modulation process?
• What visual representation is produced for a voltage in a sinewave circuit using the polar coordinate system?
• What is the purpose of adjusting the pulse repetition rate (pps) in a RADAR system?
• What is the peak voltage at a common household electrical outlet?
• Which class of amplifier provides the highest efficiency?
• What turns ratio does a transformer require to match a source impedance of 500 ohms to a load of 10 ohms?
• What equipment may be useful to track down EMI aboard a ship or aircraft?
• When soldering or working with CMOS electronics products or equipment, a wrist strap:
• When a lead-acid storage battery is being charged, what harmful effect can occur to humans?
• What current will flow in a 6 volt storage battery with an internal resistance of 0.01 ohms when a 3-watt, 6-volt lamp is connected?
• What is the maximum FM deviation for voice operation of a normal wideband channel on VHF and UHF?
• Which logic gate will output a logic "1" only if both of its inputs are also "1"?
• What is a truth table?
• Which of the following statements is true?
• Which of the following are the two basic types of junction field-effect transistors?
• What risk is associated with looking directly into a fiber optic cable?
• What effect does using a push-pull amplifier have on even-order harmonics?
• What advantage does digital signal processing (DSP) provide for RADAR signals?
• What does the term 'apparent power' represent in an electrical circuit?
• Good conductors with minimum resistance have what type of electrons?
• What is a common method used to program radios without using a wired connection?
• What are the elements of a unijunction transistor?
• What happens to current in a parallel circuit as more resistors are added?
• What describes the phenomenon where induced currents produce expanding magnetic fields that oppose the original magnetic field?
• Which aspect of the ADF is particularly beneficial for pilots?
• What is the recommended pulse width and repetition rate for long-range RADAR operation?
• How is the voltage produced in a receiving antenna related to the received field strength?
• What is the second harmonic of a frequency at 380 kHz?
• Which factor has the least effect on the resistance of a conductor?
• In terms of signal fidelity, which class of amplifier generally produces the highest quality output?
• In binary numbers, how would you note the quantity TWO?
• What is most important when routing cables in a mobile unit?
• Where is a low-pass filter typically located in a radio receiver?
• What is the piezoelectric effect?
• Which paired channel do most airborne Distance Measuring Equipment systems tune to automatically?
• What does the mixing process in a radio receiver involve?
• Which characteristic defines an AND gate?
• What is one common use for PIN diodes?
• Why is accuracy limited on the scale of an analog wattmeter?
• How many degrees are in one complete cycle of a sine wave?
• Which of the following is not part of a MCU processor?
• What occurs if the load is removed from an operating series DC motor?
• Which amplifier class is typically used in high-efficiency applications due to its low power dissipation?
• Which components are involved in the description of an optoisolator?
• What type of antenna is used to receive 1030 MHz interrogation signals in an aircraft's Mode C transponder?
• The expression "voltage regulation" as it applies to a shunt-wound DC generator operating at a constant frequency refers to:
• What is the purpose of de-emphasis in the receiver audio stage?
• What is an m-derived filter?
• What instrument may be used to verify proper radio antenna functioning?
• What type of memory IC must be refreshed periodically to maintain data?
• Which configuration can lead to maximum voltage in an antenna?
• For a repeater with a 75 watts transmitter output and various losses including a 10 dB antenna gain, what is the effective radiated power?
• What is the primary frequency that is used exclusively for NAVTEX broadcasts internationally?
• At resonance, what is the characteristic of the current flow in a series R-L-C circuit?
• What is the average fully-charged voltage of a lead-acid storage cell?
• What type of wave is composed of sine waves at the fundamental frequency and all odd harmonics?
• If the MPE power is present, how often must personnel in the area be trained and certified?
• What will a NOT gate output if the input is low?
• What type of power does a capacitor primarily store?
• What is a frequency discriminator in a radio receiver?
• What is the term used for the time it takes to complete one full cycle of a sine wave?
• Which factor could result in a high standing wave ratio on a transmission line?
• In terms of communication capabilities, what does INMARSAT-M offer?
• What risk may occur with excessive gain in a VHF receiver's front end?
• In a negative-logic circuit, what level is used to represent a logic 0?
• What does the term "intermodulation interference" refer to?
• To divide a signal frequency by 4, how many flip-flops are necessary?
• What color is the binder for pairs 51-75 in a 100-pair cable?
• Which statement is true regarding the filter output characteristics?
• What best describes the orbital arrangement of GPS satellites?
• What is the primary advantage of using a GaAsFET preamplifier in modern VHF radio receivers?
• What is the primary purpose of an aircraft's VOR system?
• What is one way that voice is transmitted in a pulse-width modulation system?
• What is the term used for the oscillator stage in a frequency synthesizer?
• In the context of microprocessors, what does "IO" refer to?
• What is the channel spacing used for VHF marine radio?
• If an inductor has a reactance of 40 ohms and is connected in series with a resistor of 60 ohms, what is the total impedance?
• A vertical 1/4 wave antenna receives signals from which direction?
• What electrical component can be monitored with a DC voltmeter in a radio circuit?
• How do you calculate the total capacitance of three capacitors in parallel?
• How does the gain of a parabolic dish antenna change when the operating frequency is doubled?
• What might contribute to apparent low voltage on marine SSB transmitting?
• Which characteristic must a transformer have to step up its input voltage?
• What is an important factor in pulse-code modulation using time-division multiplex?
• What is a primary characteristic of INMARSAT-C terminals?
• What formula would calculate the total inductance of inductors in series?
• How can a double-sideband phone signal be produced?
• Which factors limit the accuracy and stability of an oscilloscope?
• For a target 25 miles away, what is the appropriate pulse width and repetition rate when the RADAR is set to the 25 mile range?
• What is the line current of a 7 horsepower motor operating on 120 volts at full load, with a power factor of 0.8, and 95% efficiency?
• What is the role of address pins in a memory IC?
• What does a steady output of 75 watts on a 150 watt marine SSB HF transceiver indicate?
• In an NMEA 2000 device, a load equivalence number (LEN) of 1 corresponds to which current consumption?
• Which of the following best describes the behavior of a logic high input?
• What is the total voltage when 12 Nickel-Cadmium batteries are connected in series?
• What is an advantage of a constant-k filter?
• What is the standard scan rate for high-frequency weather facsimile reception from shore stations?
• Which device is known for isolating circuits while allowing light to pass?
• What term describes the time required for a capacitor in an RC circuit to charge to 63.2% of the supply voltage?
• What is the primary reason behind using a sacrificial anode in corrosion control?
• What are the three general groupings of filters?
• What device is used to decrease circuit loading when using an oscilloscope?
• What does SDR stand for?
• What occurs to reactive power in a circuit containing both inductors and capacitors?
• What type of semiconductor diode varies its internal capacitance as the voltage changes?
• What type of waveform is produced at the collectors of an astable multivibrator?
• What portion of the input cycle does the output of a class AB amplifier correspond to?
• How can the resonant frequency of a Hertz antenna be lowered?
• What term is used to express the amount of electrical energy stored in an electrostatic field?
• What is the range of voltage ratings commonly available in Zener diodes?
• What primarily determines the velocity factor in a transmission line?
• What is the reason for the USA-INT control or function?
• What does a two-tone test illustrate on an oscilloscope for an SSB transmitter?
• What condition is necessary for a circuit to oscillate?
• What type of circuit component demonstrates the phenomenon of skin effect most significantly?
• Which of the following statements about SSB voice transmissions is correct?
• What is the impedance of a network composed of a 10-microhenry inductor in series with a 40-ohm resistor, at 500 MHz?
• Which piece of required GMDSS equipment is the primary source of transmitting locating signals?
• What is a common characteristic of broadband noise in synthesizer outputs?
• What is the best way for a technician to evaluate the operational condition of a software-defined transceiver?
• What is a common method for programming portable or mobile radios?
• What protective device is commonly built into the gate of MOSFETs?
• How does a strong adjacent channel signal affect a receiver?
• What does the deviation ratio represent in FM transmission?
• When applying a pure AC signal input to a certain circuit, what waveform would be displayed on an oscilloscope?
• What voltage range is considered a valid logic low input in a TTL device operating at 5 volts?
• When engaging in voice communications via an INMARSAT-B terminal, what techniques are used?
• A 500-ohm, 2-watt resistor and a 1500-ohm, 1-watt resistor are connected in parallel. What is the maximum voltage that can be applied across the parallel circuit without exceeding wattage ratings?
• What type of modulation employs frequency hopping across multiple carriers?
• In FM communication, what does the term "frequency deviation" refer to?
• What capacity in amperes is needed from a storage battery to operate a 50-watt transmitter for 6 hours, with a continuous load of 70% of 40 A and an emergency light load of 1.5 A?
• In a direct digital synthesizer, what are the unwanted components found on its output?
• Which services are typically not offered by INMARSAT-B?
• What type of waveform is produced when a sine wave is distorted?
• When an NPN transistor operates as a Class A amplifier, what is the state of the base-emitter junction?
• What would be the output of an AND gate if one of the inputs is logic "0"?
• At the ends of a half-wave antenna, what values of current and voltage exist compared to the remainder of the antenna?
• What type of multivibrator is often used as a timer?
• What is the current drawn by a 3 horsepower, 100 V DC motor that is 85% efficient?
• What factor limits the maximum forward current in a junction diode?
• What best describes the output behavior of a comparator circuit?
• What is the main function of the COSPAS-SARSAT satellite system?
• A 6 volt battery with 1.2 ohms internal resistance is connected across two light bulbs in parallel whose resistance is 12 ohms each. What is the current flow?
• Which of the following describes the INMARSAT Satellite system?
• Which operational method describes how a linear voltage regulator functions with respect to load conditions?
• Maximum power transfer occurs when the load impedance equals what?
• In a circuit, if the voltage is halved and the resistance remains the same, what happens to the current?
• What is the main purpose of a capacitor in an electrical circuit?
• Which of the following amplifiers operates in Class B mode?
• In a simple RC circuit, what primarily affects the frequency response?
• What is an important safety measure when testing radar equipment on aircraft?
• What is the purpose of a shunt resistor used with an ammeter?
• What is a common potential solution to interference caused by a radio system on the tachometer of a building's elevator circuit?
• Which device contains a multirange AF voltmeter calibrated in dB and a 1000 Hz bandstop filter?
• What is a notable difference between INMARSAT-B and INMARSAT-C antennas?
• In the context of synthesizers, what does spurs refer to?
• What is the primary function of a receiver discriminator?
• A common emitter amplifier provides:
• What is needed to improve signal clarity in the presence of strong interference?
• What does the skin effect affect in a conductor at high frequencies?
• What happens to the output voltage in a transformer as the number of secondary turns increases?
• How many stable states does a flip-flop circuit have?
• How can a monostable multivibrator be described?
• Which of the following circuits can hold a binary state indefinitely until switched?
• Which block diagram symbol in a schematic represents where audio intelligence is inserted?
• What is the main purpose of training personnel working near MPE power levels?
• What is a product detector?
• What is the primary function of the INMARSAT-C system in maritime communication?
• What is the conclusion in diagnosing a problem with a regulated power supply?
• What is the frequency range of an aircraft's Very High Frequency (VHF) communications?
• Why is the RF stage crucial in a communications receiver?
• What might happen in a receiver if excessive signal energy overdrives the mixer circuit?
• What is the peak-to-peak RF voltage on the 50-ohm output of a 100 watt transmitter?
• What would be the voltage across a 50-ohm dummy load dissipating 1,200 watts?
• Which of the following groups of metals are the best low-resistance conductors?
• Which component is used to limit current in a voltage regulator circuit?
• In a positive logic circuit, what level is used to represent a logic 1?
• What is the output you would expect from a square wave input according to the given figure?
• What type of wave is comprised of sine waves at the fundamental frequency and all its harmonics?
• What is the impedance for a network composed of a 300-ohm-reactance capacitor, a 600-ohm-reactance inductor, and a 400-ohm resistor, all connected in series?
• What services does the Iridium system provide?
• What does a 1/2 digit on a DMM indicate?
• What does the time constant of an RL circuit indicate?
• What is the 6th pair color code in a 25 pair switchboard cable?
• Why should sharp corners not be put on ground leads within a building?
• What principle allows multiple conversations to share one radio channel on a GSM channel?
• Which factor does NOT affect the resistance of a conductor?
• What effect does light have on the conductivity of photoconductive material?
• With an improper impedance match between a 30 watt transmitter and the antenna, and 5 watts reflected, how much power is actually radiated?
• What is the output peak envelope power from a transmitter as measured on an oscilloscope showing 200 volts peak-to-peak across a 50-ohm load resistor?
• What is the term for the out-of-phase power associated with inductors and capacitors?
• What is equivalent to the root-mean-square value of an AC voltage?
• What happens when a GFI detects a ground current fault?
• When does an ideal diode conduct current in a circuit?
• If a shunt motor running with a load has its shunt field opened, how would this affect the speed of the motor?
• Which function cannot be performed by an R-S flip-flop?
• What is the main function of a flip-flop circuit?
• Which term describes a communications system where the RF carrier changes based on a pre-determined sequence?
• Which oscillator circuit is commonly identified with a VFO?
• Permeability is defined as what?
• What is a characteristic of an OR gate?
• On which frequencies do Aircraft Emergency Locator Transmitters (ELT) operate?
• What are the logic levels of test points A, B, and C if A is low, B is high, and C is high?
• What process does Distance Measuring Equipment primarily rely on for calculating distance?
• A relay coil has 500 ohms resistance and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC?
• In a CTCSS controlled FM receiver, the CTCSS tone is filtered out after the:
• A flip-flop circuit is defined as what type of logic element?
• What is the characteristic of the current flow within the parallel elements of a parallel R-L-C circuit at resonance?
• What is the typical RF power output of airborne HF transmitters compared to VHF transmitters?
• Which secondary winding of a transformer will have the highest measured DC resistance if three windings produce 5.0 volts, 12.6 volts, and 150 volts?
• What triggers a squelch circuit to activate?
• How can the output of a separately-excited AC generator be controlled while running at a constant speed?
• What is a potential outcome of generating spurious mixer products in a receiver?
• In terms of oscillator stability, which circuit is preferred in VFO applications?
• How can ignition noise in radio receivers be suppressed using ferrite beads?
• An antenna radiates a primary signal of 500 watts output. If there is a 2nd harmonic output of 0.5 watt, what attenuation of the 2nd harmonic has occurred?
• What condition exists when a transistor is in saturation?
• What radio navigation aid measures the time it takes for a signal to indicate distance from an aircraft to a VORTAC station?
• What is a CODEC?
• What effect does moisture have on transmission lines if not prevented?
• What does it mean for a transistor to be fully saturated?
• What constitutes a pi-network?
• What components are typically found in a three-terminal regulator?
• What is the purpose of placing a capacitor in series with the primary of a power transformer?
• What is the maximum allowable frequency deviation for VHF marine radios?
• In polar coordinates, what is the impedance of a network composed of a 100-ohm-reactance inductor in series with a 100-ohm resistor?
• What is the primary function of a squelch circuit in a radio?
• A switching regulator's efficiency is often determined by what factor?
• After two time constants, to what percentage of the starting voltage is a capacitor in an RC circuit discharged?
• What is the name of the type of modulation in which the modulating signal varies the duration of the transmitted pulse?
• Do shorted-stub lightning protectors work at all frequencies?
• All directions associated with a VOR station are related to which reference?
• What is required to activate the DSC emergency signaling function on a marine VHF?
• What is the maximum deviation from a reading of 156,520,000 Hertz on a frequency counter with a time base accuracy of ± 1.0 ppm?
• What is the maximum rated current-carrying capacity of a resistor marked "2000 ohms, 200 watts"?
• In which frequency band does a search and rescue transponder operate?
• What is the typical effect of increasing the distance between capacitor plates in terms of capacitance?
• What is an effect of adding inductance to an antenna?
• In terms of RADAR function, what could a longer pulse width negatively affect?
• At 150 degrees, what is the amplitude of a sine wave with a peak value of 5 volts?
• In which type of circuit might an SCR be commonly found?
• In an RL circuit, what does a larger time constant imply?
• Which method reduces unwanted signals in a radio receiver?
• What frequency range does the Distance Measuring Equipment (DME) operate within?
• What type of bias ensures an LED functions correctly?
• Which stage of a receiver primarily establishes its noise figure?
• What is the orbiting altitude of the Iridium satellite communications system?
• Why is pulse position modulation used in mode C transponder transmissions?
• What is likely if the output of a marine SSB transceiver is significantly lower than expected?
• What determines the strength of the magnetic field around a conductor?
• In a circuit diagram, what is the effect of installing a small variable capacitor instead of the dashed line?
• How is a frequency counter primarily used?
• What is the best description for the INMARSAT-C system?
• Corrosion resulting from electric current flow between dissimilar metals is called what?
• How can intermodulation interference between two transmitters in close proximity often be reduced or eliminated?
• How can two similar SCRs be connected to safely distribute the power load?
• What is the term used for lines drawn from the VOR station in a particular magnetic direction?
• How many R-S flip-flops are needed to create an 8-bit storage register?
• Which statement best describes the code used for GMDSS-DSC transmissions?
• What is the function of a decade counter digital IC?
• In addition to mode C functions, what extra capability does a mode S transponder provide?
• What is the approximate ratio of peak envelope power to average power during normal voice modulation peak in a single-sideband phone signal?
• What does the term "BCD" mean?
• What role does the RADAR duplexer/circulator serve?
• What happens to the junctions in a transistor when it is conducting?
• Which op-amp configuration is considered to be operated in an open-loop mode?
• How much voltage will develop across a 500-turn secondary from a primary of 2250 turns connected to 120 VAC?
• What is the impedance of a network composed of a 400-ohm-reactance capacitor in series with a 300-ohm resistor, expressed in polar coordinates?
• Which of the following conditions can render INMARSAT-B communications impossible?
• What is the condition called when signals from two transmitters mix and create unwanted signals?
• What would happen if there is insufficient positive feedback in an oscillator circuit?
• What happens to the beamwidth of an antenna as the gain is increased?
• What is the total bandwidth of a FM phone transmission that has a 5 kHz deviation and a 3 kHz modulating frequency?
• Which three network types are commonly used to match an amplifying device to a transmission line?
• Which component is essential for converting digital signals to analog?
• What does SELCAL stand for in commercial aircraft communications?
• Which frequencies are transmitted by GPS satellites?
• What is the power factor in an R-L circuit with a 60 degree phase angle between voltage and current?
• The INMARSAT mini-M system is a:
• What are the directional characteristics of the INMARSAT-C SES antenna?
• What value of series resistor is needed for full scale deflection on a 50 microamp DC meter with an applied voltage of 200 volts DC?
• Which component is essential for DGPS to function effectively?
• To increase the resonant frequency of a 1/4 wavelength antenna, what should be added?
• Which of the following frequencies will cause an image response when mixed with a 14.255 MHz signal in a mixer with a 13.8 MHz VFO?
• What type of values does an AC ammeter indicate?
• What is the typical range of RADAR pulse widths?
• What type of digital circuit can electronically divide the frequency of an AC signal?
• Which visual phenomenon may occur due to RF exposure from portable devices?
• Which type of signals is a receiver selectivity of 10 kHz in the IF circuitry best suited for?
• What is a negative consequence of using an overly wide filter bandwidth in a receiver's IF section?
• Prior to testing any RADAR system, what should the operator first ensure?
• Which component is essential for the operation of a flip-flop circuit?
• The output of a Class C amplifier is present for what portion of the input cycle?
• What is the maximum current safe for illuminating a LED?
• What is the voltage drop across R1 if its value is 5 volts?
• What is the effect of halving the cross-sectional area of a conductor?
• What is the primary function of a flip-flop circuit?
• What type of antenna is utilized in an aircraft's ILS glideslope installation?
• How does a spectrum analyzer differ from a conventional oscilloscope?
• By which factor must the voltage in an AC circuit be multiplied to obtain the average voltage value?
• What is meant by the term modulation index?
• What aspect of RADAR operation is impacted by increasing the pulse repetition rate?
• Why does the DME ground station incorporate a built-in delay between interrogation and reply?
• Which statement correctly describes an aircraft's Automatic Direction Finding (ADF) equipment?
• The DME's distance measurement is known as slant range; what does this encompass?
• How can selectivity be achieved in a communications receiver?
• What type of interference can be attributed to unwanted signals heard in addition to desired signals?
• What is a sine wave?
• Which logic gate inverts the output of an AND gate?
• Which of the following statements about average voltage is true in AC circuits?
• What types of services does the INMARSAT-M service provide?
• What type of circuit maintains a constant output voltage over a range of load conditions?
• Which component is essential for a class C amplifier to operate efficiently in modulation?
• What portion of a microprocessor circuit is the pulse generator?
• What formula determines the inductive reactance of a coil given the frequency and coil inductance?
• In which stage of a VHF receiver is a low noise amplifier most beneficial?
• What is the primary purpose of a coupling capacitor?
• What happens to the bandwidth of an antenna as it is shortened using loading coils?
• A ship RADAR unit uses 315 watts and a radio uses 50 watts. If the equipment is connected to a 50 ampere-hour battery rated at 12.6 volts, how long will the battery last?
• What is the basic unit of electrical power?
• What is a characteristic of 406 MHz EPIRB transmissions?
• Which of the following represents the best standing wave ratio (SWR)?
• What is used to couple energy into and out of a waveguide?
• In a RADAR system set to a 6 mile range, what pulse width and pulse repetition rate should be utilized?
• In which band is shipboard RADAR most commonly operated?
• What type of meter uses a bandstop filter for testing purposes?
• What is the effective radiated power of a repeater with 100 watts transmitter power output and specific losses?
• If the RF input to a mixer is 200 MHz and the local oscillator frequency is 150 MHz, which output frequencies can be expected at the IF output prior to filtering?
• What accurately describes an astable multivibrator?
• What is a primary application for Class C amplifiers?
• Which type of diode is capable of both amplification and oscillation?
• What is the effective radiated power of a repeater with 50 watts transmitter output and specified losses?
• What is the maximum deviation from a reading of 462,100,000 Hertz on a frequency counter with a time base accuracy of ± 0.1 ppm?
• What is the primary purpose of a bypass capacitor?
• What describes a diode junction that is forward biased?
• Which type of amplifier configuration has more current gain than common emitter or common base?
• During the charging of a lead-acid battery, which gas poses a risk of explosion?
• What is one of the main purposes of a CODEC in digital communications?
• What type of synthesizer circuit uses a phase comparator, look-up table, digital-to-analog converter, and a low-pass antialias filter?
• In the context of phase relationships between two signals, if signal B is lagging signal A by 90 degrees, what can be inferred?
• What primarily determines the visible color emitted by an LED junction?
• What is the primary function of the ATR box in a RADAR system?
• What is the term for the time required for the current in an RL circuit to build up to 63.2% of its maximum value?
• What does the term "alpha" refer to in bipolar transistors?
• Which capacitor is used as a bypass capacitor in a given circuit?
• What type of multivibrator produces a continuous square wave output?
• To calculate trickle charging resistance for a 12.5-volt battery from a 110-V DC line, what resistance value is needed at 0.5 A?
• What is the common power supply voltage used for TTL series integrated circuits?
• In a regulated power supply, what type of component will most likely be used to establish a reference voltage?
• Which of these will be most useful for insulation at UHF frequencies?
• What metal is usually employed as a sacrificial anode for corrosion control purposes?
• When an R-L-C circuit is resonant, what is true about the total impedance?
• Which component provides the transmitter output power for a RADAR system?
• What is the primary characteristic of ROM in semiconductor ICs?
• What principal frequencies are produced at the output of a mixer circuit?
• In which oscillator circuit would you find a quartz crystal?
• What modulation type involves frequency hopping of one carrier or multiple simultaneous carriers?
• What logic state do TTL inputs develop when left open?
• How does the input impedance of a field-effect transistor (FET) compare to that of a bipolar transistor?
• What is the frequency ratio of the output to the input of a single-phase full-wave rectifier?
• What is the deviation ratio of an FM-phone signal with a maximum frequency swing of ±7.5 kHz and a maximum modulation rate of 3.5 kHz?
• What instrument is commonly used by radio service technicians to monitor frequency, modulation, check receiver sensitivity, distortion, and to generate audio tones?
• What is the maximum deviation from a frequency reading of 462,100,000 Hertz with a time base accuracy of ± 1.0 ppm?
• For uncontrolled RF environments, over what period is MPE averaged?
• Which type of wave is characterized by a rise time that is significantly faster than the fall time?
• What is a frequency standard?
• What is the approximate magnitude of the impedance of a parallel R-L-C circuit at resonance?
• What is the main operating principle of Distance Measuring Equipment (DME)?
• In a circuit where the AC voltage and current are out of phase, how can true power be determined?
• What is the transistor called that consists of two complementary SCRs in parallel with a common gate terminal?
• Which unit is used to measure inductance?
• What is the preferred substance used to extinguish electrical short circuit fires?
• If you halve the resistance in a circuit to which constant voltage is applied, what happens to the power dissipation?
• An LED facing a photodiode in a light-tight enclosure is commonly known as a/an:
• What is the purpose of a series multiplier resistor used with a voltmeter?
• What is the RMS voltage at a common household electrical power outlet?
• What happens to receiver performance if adjacent channel signals are too strong?
• On runway approach, what does the ILS Localizer indicate?
• How does the modulation index of a phase-modulated emission relate to RF carrier frequency?
• When operating a RADAR on the 48 mile range setting, what are the recommended pulse width and pulse repetition rate?
• What is the wavelength of a shorted stub line attached to a transmission line that absorbs even harmonics?
• What CODEC is used in Phase 2 P25 radios?
• What type of interference can a spread spectrum system help mitigate?
• What is the noise floor of a receiver described as?
• When is it more desirable to use an m-derived filter over a constant-k filter?
• In an RC circuit, what does the time constant represent?
• How is the gain of a closed-loop op-amp circuit determined?
• By what factor must the voltage measured in an AC circuit be multiplied to obtain the peak voltage value?
• Which sequence correctly lists common materials in order of descending conductivity?
• Which of the following codes has gained the widest acceptance for exchange of data from one computer to another?
• For current to flow in an NPN silicon transistor's emitter-collector junction, the base must be:
• What degree of selectivity is ideal in the IF circuitry of a wideband FM phone receiver?
• How many GPS satellites are typically in operation at any given time?
• What does the horizontal axis of a spectrum analyzer display?
• What integrated circuit device converts digital signals to analog signals?
• Which term describes a reduction in receiver sensitivity caused by adjacent high-level signals?
• What will be the expected secondary voltage when 20 volts are applied to a transformer with a primary of 200 turns and a secondary of 500 turns?
• What does it indicate when a transistor is in a cut-off state?
• Which device can help to prevent intermodulation interference?
• Which of the following statements about time constants in circuits is true?
• What is the definition of an optocoupler?
• Why can RF exposure from portable radio transceivers be harmful to the eyes?
• Which class of amplifier is defined by the presence of output throughout the entire signal cycle?
• What is a balanced modulator?
• When operating a RADAR on the 1.5 mile range setting, what are the recommended pulse width and pulse repetition rate?
• What term describes a wide-bandwidth communications system with varying RF carrier frequency?
• What is the impedance of a network composed of a 0.001-microfarad capacitor in series with a 400-ohm resistor, at 500 kHz?
• What is the averaging time for Maximum Permissible Exposure (MPE) in controlled RF environments?
• Given the input levels, what would the output be if A is low, B is high, and C is high?
• What is the time constant of a circuit with two 220-microfarad capacitors and two 1-megohm resistors in parallel?
• Which class of amplifier has an operating angle of more than 180 degrees but less than 360 degrees?
• Which circuit is used to detect FM-phone signals?
• What level of the International Organization for Standardization's reference model is responsible for the actual transmission of data and handshaking signals?
• At what frequency does a network composed of a 500-picofarad capacitor and a 600-ohm resistor have an impedance of 100 ohms, /0 degrees?
• What is the RMS value of a 340-volt peak-to-peak pure sine wave?
• Which of the following answers is true regarding RF Power readings on a CDMA radio?
• What tolerance off of plumb should a single base station radio rack be installed?
• What type of signals does CTCSS squelch rely on to operate?
• What is the time constant of a circuit with a 100-microfarad capacitor and a 470-kilohm resistor in series?
• What statement best describes the INMARSAT-B services?
• Another term often used to refer to a bistable multivibrator circuit is?
• Which metal object may be least affected by galvanic corrosion when submerged in seawater?
• Which INMARSAT systems offer High Speed Data at 64/54 kbps?
• Which type of microphones are predominantly used in aviation services?
• How can you determine the RADAR range in nautical miles to an object?
• When light strikes a photoconductive material, what is generally observed?
• What is the primary purpose of the first IF amplifier stage in a receiver?
• What is the purpose of a prescaler circuit?
• What noticeable change does the photoconductive effect in crystalline solids produce?
• Which component is primarily used to reduce noise in an electrical circuit?
• Which component does the physical layer of the ISO model primarily deal with?
• Which of the following statements concerning SITOR communications is true?
• Which type of transformer winding typically has a lower resistance?
• Which of the following best describes a low-pass filter?
• Which factors should be considered when selecting an intermediate frequency?
• What VHF Channel is used for Digital Selective Calling and acknowledgement?
• What occurs in an NMEA 2000 network if one device in the line fails?
• What are two common types of spread spectrum systems used in RF communications?
• What is the resonant frequency in an electrical circuit?
• What is a pi-L network?
• In the term "ARPA RADAR," what does ARPA stand for?
• Which component is typically not utilized in TTL logic circuits?
• What protects a transmitting station from a direct lightning strike?
• What characteristic is altered in frequency modulation compared to amplitude modulation?
• Which of the following statements concerning SITOR communications is true?
• What is a common type of shipboard RADAR antenna?
• How does the COSPAS-SARSAT satellite system determine the position of a ship in distress?
• How does the construction of an LED affect its color output?
• Which device is commonly used to assess the performance of a RADAR system at sea?
• What applied voltage is required for a 50 microampere meter movement with an internal resistance of 2,000 ohms to indicate half-scale deflection?
• What does the power factor represent in an AC circuit?
• In the context of oscillators, what does the term "VCO" stand for?
• What is the product of the readings of an AC voltmeter and AC ammeter called?
• What happens to reactive power in an inductive circuit?
• What circuit component must be connected in series to protect an LED?
• Which wave is known for having abrupt transitions back and forth between two voltage levels?
• In a closed-loop op-amp circuit, which of the following determines the output voltage?
• What does the term "receiver desensitizing" refer to?
• What is the current flowing through a 52-ohm line with an input power of 1,872 watts?
• What type of wire connects an SSB automatic tuner to an insulated backstay?
• What voltage level is indicated by a successive peak value before it's converted to RMS?
• Which logic gate provides an active high output when both inputs are active high?
• What is the image frequency if the normal channel is 151.000 MHz and the IF is at 11.000 MHz?
• How is a single-sideband phone signal generated?
• Why should you not use white or translucent plastic tie wraps on a radio tower?
• What type of communication does the INMARSAT mini-M primarily focus on?
• How is a square wave described?
• The sequence ARQ, FEC, SFEC best corresponds to which of the following?
• How many horsepower is equivalent to 746 watts, which corresponds to lifting 550 pounds at the rate of one-foot-per-second?
• Which instrument is considered the most accurate for checking antennas at their operating frequency?
• Why is the Colpitts oscillator commonly utilized in variable frequency oscillators (VFOs)?
• Why is knowing the radiation resistance of an antenna significant?
• What does the effective radiated power of a repeater take into account?
• In polar coordinates, what is the impedance of a network comprising a 400-ohm-reactance inductor in parallel with a 300-ohm resistor?
• What component is essential for a Digital Coded Squelch to function?
• What is a possible reason for voltage drop across a resistor?
• In an NPN transistor, which junction must be forward biased for current to flow?
• What is the power factor in an R-L circuit with a 45 degree phase angle between voltage and current?
• What test instrument can be used to display spurious signals in the output of a radio transmitter?
• What happens to the phase relationship of current and voltage in a resonant circuit?
• What is the effect of pulse type interference related to engine speed on automobile radios?
• What type of antenna pattern is radiated from a ground station's phased-array directional antenna in a Mode S interrogation signal?
• What is essential for the detection process in a radio receiver to occur?
• How should shielding be grounded on an NMEA 0183 data line?
• What are the two main categories of semiconductor diodes?
• What is the relationship between voltage, current, and resistance known as?
• What VHF channel is assigned for distress and calling?
• Which instrument is used to indicate high and low digital voltage states?
• What is characteristic of a switching electronic voltage regulator?
• Which characteristic is notable about INMARSAT-B regarding communication quality?
• In a microprocessor, what is the meaning of the term "ALU"?
• When evaluating RF site exposure, what percentage of the maximum permissible power density exposure limit must antennas have?
• What is the approximate magnitude of the impedance of a series R-L-C circuit at resonance?
• What are the three terminals of a TRIAC?
• What is the primary advantage of using a 400 Hz power supply in aviation equipment?
• Which components make up a phase-locked loop (PLL) circuit?
• What is the modulation index for an FM phone signal with a maximum frequency deviation of 3,000 Hz and a modulating frequency of 1,000 Hz?
• Why is it crucial to maintain a filter bandwidth that is slightly greater than the bandwidth of the received signal?
• The GSM uses what type of CODEC for digital mobile radio system communications?