Electronics Technician Second Class (ET2) Advancement Practice Exam

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• How much time is required for electromagnetic energy to travel 1 nautical mile and return to the source?
• Radar surface-angular measurements are measured in which plane?
• What material is commonly used as a semiconductor in electronic devices?
• What is the main role of an amplifier in electronic systems?
• What are the four basic transmitter types?
• What coordinates are presented on a plan position indicator (PPI) scope?
• What is a primary characteristic of a digital signal?
• What are the required radar inputs for proper indicator operation?
• Which component is responsible for improving signal strength in a transmitter?
• The broadside array consists of a flat reflector and which additional elements?
• How is pulse repetition time (PRT) related to pulse repetition frequency (PRF)?
• What is the primary use of a Zener diode?
• Why are frequency multipliers utilized in communication systems?
• Which component represents the final stage of a transmitter?
• What does an oscilloscope primarily measure?
• What device switches power from the normal source to an alternate source for nonvital users?
• Which component is specifically used to manage electrical overload?
• Range-marker generators produce pulses based on which radar constant?
• Which radar component allows the same antenna to be used for both transmitting and receiving?
• In the context of radio transmission, which term describes the act of varying the signal to carry information?
• What is the main purpose of a rectifier?
• The display screen of a spectrum analyzer shows a graphic plot of which two signal characteristics?
• What must be added to the dBm reading when measuring receiver sensitivity?
• What is the effect of using a pull-up resistor?
• What is the main advantage of radiotelegraph communications?
• How does a hybrid amplifier differ from a linear amplifier?
• A typical liquid-cooling system comprises what loops?
• What is the primary function of the oscillator in a continuous wave (CW) transmitter?
• What is the primary use of a radio teletypewriter?
• What property of a phototransistor determines its function?
• What principle does Ohm's Law explain?
• What two elements support only designated Navy requirements?
• What is the main function of a transistor in a circuit?
• Which of the following elements indicates the strength of a signal?
• What does a circuit breaker do?
• What is the primary role of a resistor in a circuit?
• What is the primary purpose of a fuse in an electrical circuit?
• What characterizes Direct Current (DC) as opposed to Alternating Current (AC)?
• What is the purpose of an order-wire circuit in communication systems?
• Transmitter power readings are most commonly referenced to which power level?
• Which type of radar is capable of detecting range, bearing, and height?
• What is the function of a phototransistor?
• What is the purpose of a fuse box in an electrical system?
• In electrical systems, what does the term "ground" refer to?
• What is the main function of a transformer?
• What is the operational principle of a relay?
• Which formula represents electrical power?
• What characteristic does the spectrum of a radar transmitter describe?
• Why is radiotelephone considered useful for military communications?
• What is the primary function of signal conditioning?
• The peak power of a radar system depends on which factors?
• Which two factors determine the degree of bearing resolution for a radar system?
• What does the term 'ground' refer to in electrical systems?
• What does amplitude modulation (AM) primarily alter in a signal?
• In digital circuits, what is the main function of flip-flops?
• What type of signal does a digital circuit primarily operate with?
• How is frequency defined in the context of electrical signals?
• What term describes the rotation of an RF feed source to produce a conical scan pattern?
• What determines the effectiveness of energy transfer in resonant circuits?
• Which component is used to stabilize voltage in a circuit?
• What term describes the product of pulse width and pulse-repetition frequency?
• What is an electric field?
• When using frequencies above 30 megahertz, you are normally limited to using which range?
• What type of radar transmitter power is measured over a period of time?
• In an AC circuit, impedance combines which two factors?
• What is a primary function of an integrator circuit?
• In addition to recovery time, what determines the minimum range of a radar set?
• What is the purpose of biasing in transistors?
• What is the unit of electrical power?
• Which component is essential for converting AC to DC in electronic circuits?
• What are the four basic characteristics of a receiver?
• How many phases are typically used in shipboard distribution systems that utilize AC power?
• Why does the Navy primarily use the upper and lower ends of the mf band?
• Which frequency range is not associated with low-frequency (LF) signals?
• Where should the transmitter spectrum be positioned in relation to the receiver response curve?
• A message transmitted on several frequencies at the same time is an example of what type of transmission?
• Microcontrollers are commonly used for what purpose?
• Which radar scope uses a range step for measuring range?
• When does emergency power activate in the event of normal power loss?
• What differentiates the electronics dry-air branch from the vital service LP air main?
• What measurement unit is used to express electrical resistance?
• What is the role of a heat sink in electronic devices?
• A parabolic reflector changes a spherical wavefront into which type of wavefront?
• In an FM transmitter, when does the oscillator generate a steady frequency?
• What describes capacitive reactance?
• What device is used to store electrical energy in an electric field?
• Atmospheric interference with the travel of electromagnetic energy increases with what RF energy characteristic?
• What is the typical frequency range for low-frequency (LF) signals?
• In electronics, what does PWM stand for?
• What is the unit of capacitance?
• What is adjusted in electronic scanning to change the characteristics of radiated energy?
• How does increasing the radar beam width affect target resolution?
• Which subsystem provides timing signals to synchronize the entire radar system?
• What does an inductor do in an electrical circuit?
• What term describes a radar system's ability to differentiate between closely spaced targets?
• Which type of filter allows signals below a certain frequency to pass while attenuating higher frequencies?
• What term is used to identify the distance from a radar set to a target along the line of sight?
• How do series circuits differ from parallel circuits?
• Which of the following describes direct current (DC)?
• What is defined as the process used to transmit photographs, charts, and other graphic information?
• In the example 1A6CR3, what is the assembly designator?
• What does the function of biasing mainly influence in a transistor?
• What are the two general classes of antennas most commonly used with radar?
• How do radio frequency (RF) signals differ from audio signals?
• What is the primary purpose of a radar's Modulator?
• Which of the following are basic functions that a receiver must perform?
• Which type of deflection coils is used most often in radar systems?
• Which feature of radar systems is crucial for detecting target proximity?
• Which of the following is a characteristic of a series circuit?
• What are the five most prominent communications modes of operation?
• What is the normal source of dry air for a radar system on a ship?
• What does the term "bandwidth" refer to in electronics?
• What does "saturation" mean in relation to a transistor?
• What does a digital-to-analog converter (DAC) do?
• What is the function of a diode in electronic circuits?
• What type of radiator typically drives a corner reflector?
• What function does a diode bridge serve?
• A system is subdivided into which of the following levels?
• In a series circuit, what happens if one component fails?
• What pulse starts the range sweep in a range-gate generator?
• What does a power supply unit (PSU) do?
• What is the primary purpose of a transistor in electronics?
• What type of signal does a Zener diode primarily manage?
• Which component is defined as a coil of wire that stores energy in a magnetic field?
• In an electrical context, what is the function of a fuse?
• What characterizes a hybrid amplifier?
• What does an inductor primarily do in an electrical circuit?
• What type of target bearing is defined based on the ship's position?
• If the fundamental frequency is 200 megahertz, what is the third harmonic?
• The power gain of an antenna is directly related to which other antenna property?
• Which type of current alternates direction regularly?
• What phenomenon occurs when atmospheric temperature first increases with altitude and then decreases?
• Which component is used to control current flow in a circuit by changing resistance?
• What are the four general types of communications services in the hf band?
• The majority of VLF transmitters are primarily used for what purpose?
• Today the Navy uses LF communications as a segment of which operational system?
• What is the primary function of a voltage regulator?
• What is the function of a diode in a circuit?
• What is the main purpose of a capacitor in an electronic circuit?
• What does resonance in electronic circuits signify?
• What are the two basic methods of radar scanning?
• What is the primary function of an antenna in communications?
• Receiver bandwidth is defined as the range of frequencies between which two specific points?
• What is meant by "decibel" in electronics?
• What characteristic of a receiver enhances its ability to select desired frequencies?
• What type of ranging circuit is commonly used with radar to achieve extremely accurate range data?
• How is "impedance" best defined in an electrical circuit?
• What does the term "circuit load" refer to?
• What role does a resistor play in controlling current levels?
• What defines a harmonic in relation to frequency generation?
• What are the two types of electrical communications?
• What is the result of proper biasing in transistor applications?
• What is the purpose of a pull-up resistor in electronics?
• In a schematic, what does the ground connection symbol typically look like?
• What type of cooling system is typically used to control ambient room temperature?
• Which three fundamental quantities are involved in radar displays?
• What is a schematic diagram used for?
• What is the speed of electromagnetic energy traveling through air?
• What is the main difference between a logic gate and a flip-flop?
• In addition to serving as directional radiators, what other purpose do horn radiators serve?
• What does an RF signal attenuator do?
• What is the primary function of an LCR meter in electronics?
• Receiver sensitivity is determined by measuring the power level of which signal?
• What is meant by bandwidth limitation in electronic circuits?
• How does an operator determine when the target moves off the axis in a single-lobe scanning system?
• What is a common use for a multimeter?
• What does the air control panel manage within a system?
• What kind of relationship does the ideal radar spectrum have with the carrier frequency?
• What is the recommended procedure when the power input to your equipment is missing?
• What are two advantages of single sideband (SSB) transmission?
• What does modulation accomplish in signal processing?
• What is the main function of a transformer in an electrical circuit?
• What distinguishes an NPN transistor from a PNP transistor?
• Which component is primarily responsible for controlling higher power circuits?
• Why is resonance important in electronic circuits?
• What is typically produced by a circuit at its natural frequency?
• What does "signal-to-noise ratio" refer to?
• What are some disadvantages of radiotelephone communications?
• What type of loop in a cooling system is typically supplied by seawater?
• What impact does a temperature inversion have on radar performance?
• How does the speed of electromagnetic energy change with increased altitude in the atmosphere?
• What benefit does a duplexer provide in radar systems?
• How many major lobes are produced by a paraboloid reflector?
• What type of wave does a continuous wave (CW) transmitter produce?
• Physically separating receive antennas is an example of what technique?
• What is one practical application of a multimeter?
• What aspect of circuitry does an LCR meter not measure?
• The naval communications system is made up of what two groups of communications?
• A loss of receiver sensitivity has the same impact on range performance as which other loss?
• What four switched networks are part of the defense communications system?
• Why are schematic diagrams essential in electronics?
• What is the simplest type of scanning used in radar systems?
• What device is used to store electrical energy for short durations?
• What does the term "phase" refer to in AC signals?
• What indicates the end of the usefulness of a tr tube?
• In a transmitter that uses a high-power oscillator, what activates the oscillator?
• What kind of energy transformation does a power supply unit (PSU) perform?