Amateur Extra › E6
E6 Circuit Components
68 questions in the pool. Your exam will include 6, one from each group below.
E6A
Semiconductor materials and devices: semiconductor materials; bipolar junction transistors; operation and types of field-effect transistors
- E6A01In what application is gallium arsenide used as a semiconductor material?
- E6A02Which of the following semiconductor materials contains excess free electrons?
- E6A03Why does a PN-junction diode not conduct current when reverse biased?
- E6A04What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?
- E6A05How does DC input impedance at the gate of a field-effect transistor (FET) compare with that of a bipolar transistor?
- E6A06What is the beta of a bipolar junction transistor?
- E6A07Which of the following indicates that a silicon NPN junction transistor is biased on?
- E6A08What is the term for the frequency at which the grounded-base current gain of a bipolar junction transistor has decreased to 0.7 of the gain obtainable at 1 kHz?
- E6A09What is a depletion-mode field-effect transistor (FET)?
- E6A10In Figure E6-1, which is the schematic symbol for an N-channel dual-gate MOSFET?
- E6A11In Figure E6-1, which is the schematic symbol for a P-channel junction FET?
- E6A12What is the purpose of connecting Zener diodes between a MOSFET gate and its source or drain?
E6B
Diodes
- E6B01What is the most useful characteristic of a Zener diode?
- E6B02Which characteristic of a Schottky diode makes it a better choice than a silicon junction diode for use as a power supply rectifier?
- E6B03What property of an LED's semiconductor material determines its forward voltage drop?
- E6B04What type of semiconductor device is designed for use as a voltage-controlled capacitor?
- E6B05What characteristic of a PIN diode makes it useful as an RF switch?
- E6B06Which of the following is a common use of a Schottky diode?
- E6B07What causes a junction diode to fail from excessive current?
- E6B08Which of the following is a Schottky barrier diode?
- E6B09What is a common use for point-contact diodes?
- E6B10In Figure E6-2, which is the schematic symbol for a Schottky diode?
- E6B11What is used to control the attenuation of RF signals by a PIN diode?
E6C
Digital ICs: families of digital ICs; gates; programmable logic devices
- E6C01What is the function of hysteresis in a comparator?
- E6C02What happens when the level of a comparator's input signal crosses the threshold voltage?
- E6C03What is tri-state logic?
- E6C04Which of the following is an advantage of BiCMOS logic?
- E6C05Which of the following digital logic families has the lowest power consumption?
- E6C06Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?
- E6C07What best describes a pull-up or pull-down resistor?
- E6C08In Figure E6-3, which is the schematic symbol for a NAND gate?
- E6C09What is used to design the configuration of a field-programmable gate array (FPGA)?
- E6C10In Figure E6-3, which is the schematic symbol for a NOR gate?
- E6C11In Figure E6-3, which is the schematic symbol for the NOT operation (inversion)?
E6D
Inductors and piezoelectricity: permeability, core material and configuration; transformers; piezoelectric devices
- E6D01What is piezoelectricity?
- E6D02What is the equivalent circuit of a quartz crystal?
- E6D03Which of the following is an aspect of the piezoelectric effect?
- E6D04Why are cores of inductors and transformers sometimes constructed of thin layers?
- E6D05How do ferrite and powdered iron compare for use in an inductor core?
- E6D06What core material property determines the inductance of an inductor?
- E6D08Which of the following materials has the highest temperature stability of its magnetic characteristics?
- E6D09What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier?
- E6D10What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor?
- E6D11Which type of core material decreases inductance when inserted into a coil?
- E6D12What causes inductor saturation?
E6E
Semiconductor materials and packages for RF use
- E6E01Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies?
- E6E02Which of the following device packages is a through-hole type?
- E6E03Which of the following materials supports the highest frequency of operation when used in MMICs?
- E6E04Which is the most common input and output impedance of MMICs?
- E6E05Which of the following noise figure values is typical of a low-noise UHF preamplifier?
- E6E06What characteristics of MMICs make them a popular choice for VHF through microwave circuits?
- E6E07What type of transmission line is often used for connections to MMICs?
- E6E08How is power supplied to the most common type of MMIC?
- E6E09Which of the following component package types have the least parasitic effects at frequencies above the HF range?
- E6E10What advantage does surface-mount technology offer at RF compared to using through-hole components?
- E6E11What is a characteristic of DIP packaging used for integrated circuits?
- E6E12Why are DIP through-hole package ICs not typically used at UHF and higher frequencies?
E6F
Electro-optical technology: photoconductivity; photovoltaic devices; optical sensors and encoders; optically isolated switching
- E6F01What absorbs the energy from light falling on a photovoltaic cell?
- E6F02What happens to photoconductive material when light shines on it?
- E6F03What is the most common configuration of an optoisolator or optocoupler?
- E6F04What is the photovoltaic effect?
- E6F05Which of the following describes an optical shaft encoder?
- E6F06Which of these materials is most commonly used to create photoconductive devices?
- E6F07What is a solid-state relay?
- E6F08Why are optoisolators often used in conjunction with solid-state circuits that control 120 VAC circuits?
- E6F09What is the efficiency of a photovoltaic cell?
- E6F10What is the most common material used in power-generating photovoltaic cells?
- E6F11What is the approximate open-circuit voltage produced by a fully illuminated silicon photovoltaic cell?