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Amateur Radio Question PoolsNew! View the differences between the 2008 Extra question pool and the previous pool. General Class Question PoolPrev 1 2 3 4 5 6 7 8 9 0 NextG6A01 What will happen to the resistance if the temperature of a carbon resistor is increased? It will increase by 20% for every 10 degrees centigrade It will stay the same It will change depending on the resistor's temperature coefficient rating It will become time dependent G6A02 What type of capacitor is often used in power-supply circuits to filter the rectified AC? Disc ceramic Vacuum variable Mica Electrolytic G6A03 Which of the following is the primary advantage of ceramic capacitors? Tight tolerance High stability High capacitance for given volume Comparatively low cost G6A04 Which of the following is an advantage of an electrolytic capacitor? Tight tolerance Non-polarized High capacitance for given volume Inexpensive RF capacitor G6A05 Which of the following is one effect of lead inductance in a capacitor used at VHF and above? Effective capacitance may be reduced Voltage rating may be reduced ESR may be reduced The polarity of the capacitor might become reversed G6A06 What is the main disadvantage of using a conventional wire-wound resistor in a resonant circuit? The resistor's tolerance value would not be adequate for such a circuit The resistor's inductance could detune the circuit The resistor could overheat The resistor's internal capacitance would detune the circuit G6A07 What is an advantage of using a ferrite core with a toroidal inductor? Large values of inductance may be obtained The magnetic properties of the core may be optimized for a specific range of frequencies Most of the magnetic field is contained in the core All of these choices are correct G6A08 How should two solenoid inductors be placed so as to minimize their mutual inductance? In line with their winding axis With their winding axes parallel to each other With their winding axes at right angles to each another Within the same shielded enclosure G6A09 Why might it be important to minimize the mutual inductance between two inductors? To increase the energy transfer between both circuits To reduce or eliminate unwanted coupling To reduce conducted emissions To increase the self-resonant frequency of both inductors G6A10 What is an effect of inter-turn capacitance in an inductor? The magnetic field may become inverted The inductor may become self resonant at some frequencies The permeability will increase The voltage rating may be exceeded G6A11 What is the common name for a capacitor connected across a transformer secondary that is used to absorb transient voltage spikes? Clipper capacitor Trimmer capacitor Feedback capacitor Suppressor capacitor G6A12 What is the common name for an inductor used to help smooth the DC output from the rectifier in a conventional power supply? Back EMF choke Repulsion coil Charging inductor Filter choke G6A13 What type of component is a thermistor? A resistor that is resistant to changes in value with temperature variations A device having a controlled change in resistance with temperature variations A special type of transistor for use at very cold temperatures A capacitor that changes value with temperature G6B01 What is the peak-inverse-voltage rating of a rectifier? The maximum voltage the rectifier will handle in the conducting direction 1.4 times the AC frequency The maximum voltage the rectifier will handle in the non-conducting direction 2.8 times the AC frequency G6B02 What are the two major ratings that must not be exceeded for silicon-diode rectifiers? Peak inverse voltage; average forward current Average power; average voltage Capacitive reactance; avalanche voltage Peak load impedance; peak voltage G6B03 What is the approximate junction threshold voltage of a germanium diode? 0.1 volt 0.3 volts 0.7 volts 1.0 volts G6B04 When two or more diodes are connected in parallel to increase current handling capacity, what is the purpose of the resistor connected in series with each diode? The resistors ensure the thermal stability of the power supply The resistors regulate the power supply output voltage The resistors ensure that one diode doesn't carry most of the current The resistors act as swamping resistors in the circuit G6B05 What is the approximate junction threshold voltage of a silicon diode? 0.1 volt 0.3 volts 0.7 volts 1.0 volts G6B06 Which of the following is an advantage of using a Schottky diode in an RF switching circuit as compared to a standard silicon diode? Lower capacitance Lower inductance Longer switching times Higher breakdown voltage G6B07 What are the stable operating points for a bipolar transistor that is used as a switch in a logic circuit? Its saturation and cut-off regions Its active region (between the cut-off and saturation regions) Between its peak and valley current points Between its enhancement and deletion modes G6B08 Why is it often necessary to insulate the case of a large power transistor? To increase the beta of the transistor To improve the power dissipation capability To reduce stray capacitance To avoid shorting the collector or drain voltage to ground G6B09 Which of the following describes the construction of a MOSFET? The gate is formed by a back-biased junction The gate is separated from the channel with a thin insulating layer The source is separated from the drain by a thin insulating later The source is formed by depositing metal on silicon G6B10 Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate? Control grid Heater Screen Grid Suppressor grid G6B11 Which of the following solid state devices is most like a vacuum tube in its general characteristics? A bipolar transistor An FET A tunnel diode A varistor G6B12 What is the primary purpose of a screen grid in a vacuum tube? To reduce grid-to-plate capacitance To increase efficiency To increase the high frequency response To decrease plate resistance G6B13 What is an advantage of the low internal resistance of Nickel Cadmium batteries? Long life High discharge current High voltage Rapid recharge G6B14 What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead acid battery? 6 volts 8.5 volts 10.5 volts 12 volts G6B15 When is it acceptable to recharge a carbon-zinc primary cell? As long as the voltage has not been allowed to drop below 1.0 volt When the cell is kept warm during the recharging period When a constant current charger is used Never G6B16 Which of the following is a rechargeable battery? Carbon-zinc Silver oxide Nickel Metal Hydride Mercury G6C01 Which of the following is most often provided as an analog integrated circuit? NAND Gate Gallium Arsenide UHF Receiver "front end" Amplifier Frequency Counter Linear voltage regulator G6C02 Which of the following is the most commonly used digital logic family of integrated circuits? RTL TTL CMOS PMOS G6C03 Which of the following is an advantage of CMOS Logic integrated circuits compared to TTL logic circuits? Low power consumption High power handling capability Better suited for RF amplification Better suited for power supply regulation G6C04 What is meant by the term ROM? Resistor Operated Memory Read Only Memory Random Operational Memory Resistant to Overload Memory G6C05 What is meant when memory is characterized as "non-volatile"? It is resistant to radiation damage It is resistant to high temperatures The stored information is maintained even if power is removed The stored information cannot be changed once written G6C06 Which type of integrated circuit is an operational amplifier? Digital MMIC Programmable Analog G6C07 What is one disadvantage of an incandescent indicator compared to a LED? Low power consumption High speed Long life High power consumption G6C08 How is an LED biased when emitting light? Beyond cutoff At the Zener voltage Reverse Biased Forward Biased G6C09 Which of the following is a characteristic of a liquid crystal display? It requires ambient or back lighting It offers a wide dynamic range It has a wide viewing angle All of these choices are correct G6C10 What is meant by the term MMIC? Multi Megabyte Integrated Circuit Monolithic Microwave Integrated Circuit Military-specification Manufactured Integrated Circuit Mode Modulated Integrated Circuit G6C11 What is a microprocessor? A low powered analog signal processor used as a microwave detector A miniature computer on a single integrated circuit chip A microwave detector, amplifier, and local oscillator on a chip A low voltage amplifier used in a microwave transmitter modulator stage G6C12 What two devices in an amateur radio station might be connected using a USB interface? Computer and transceiver Microphone and transceiver Amplifier and antenna Power supply and amplifier |
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