1.04 UTF-8 J 0 0 1243588 E6A01 In what application is gallium arsenide used as a semiconductor material in preference to germanium or silicon? 0 In high-current rectifier circuits 0 In high-power audio circuits 0 At microwave-frequency frequencies 1 At very low frequency RF circuits 0 E6A02 What type of semiconductor material contains more free electrons than pure germanium or silicon crystals? 0 N-type 1 P-type 0 Bipolar 0 Insulated gate 0 E6A03 What are the majority charge carriers in P-type semiconductor material? 0 Free neutrons 0 Free protons 0 Holes 1 Free electrons 0 E6A04 What is the name given to an impurity atom that adds holes to a semiconductor crystal structure? 0 Insulator impurity 0 N-type impurity 0 Acceptor impurity 1 Donor impurity 0 E6A05 What is the alpha of a bipolar transistor? 0 The change of collector current with respect to base current 0 The change of base current with respect to collector current 0 The change of collector current with respect to emitter current 1 The change of collector current with respect to gate current 0 E6A06 In Figure E6-1, what is the schematic symbol for a PNP transistor? 0 1 1 2 0 4 0 5 0 E6A07 What term indicates the frequency at which a transistor grounded base current gain has decreased to 0.7 of the gain obtainable at 1 kHz? 0 Corner frequency 0 Alpha rejection frequency 0 Beta cutoff frequency 0 Alpha cutoff frequency 1 E6A08 What is a depletion-mode FET? 0 An FET that has a channel with no gate voltage applied; a current flows with zero gate voltage 1 An FET that has a channel that blocks current when the gate voltage is zero 0 An FET without a channel; no current flows with zero gate voltage 0 An FET without a channel to hinder current through the gate 0 E6A09 In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET? 0 2 0 4 1 5 0 6 0 E6A10 In Figure E6-2, what is the schematic symbol for a P-channel junction FET? 0 1 1 2 0 3 0 6 0 E6A11 Why do many MOSFET devices have built-in gate-protective Zener diodes? 0 To provide a voltage reference for the correct amount of reverse-bias gate voltage 0 To protect the substrate from excessive voltages 0 To keep the gate voltage within specifications and prevent the device from overheating 0 To prevent the gate insulation from being punctured by small static charges or excessive voltages 1 E6A12 What do the initials CMOS stand for? 0 Common mode oscillating system 0 Complementary mica-oxide silicon 0 Complementary metal-oxide semiconductor 1 Complementary metal-oxide substrate 0 E6A13 How does DC input impedance on the gate of a field-effect transistor compare with the DC input impedance of a bipolar transistor? 0 They cannot be compared without first knowing the supply voltage 0 An FET has low input impedance; a bipolar transistor has high input impedance 0 An FET has high input impedance; a bipolar transistor has low input impedance 1 The input impedance of FETs and bipolar transistors is the same 0 E6A14 What two elements widely used in semiconductor devices exhibit both metallic and nonmetallic characteristics? 0 Silicon and gold 0 Silicon and germanium 1 Galena and germanium 0 Galena and bismuth 0 E6A15 What type of semiconductor material contains fewer free electrons than pure germanium or silicon crystals? 0 N-type 0 P-type 1 Superconductor-type 0 Bipolar-type 0 E6A16 What are the majority charge carriers in N-type semiconductor material? 0 Holes 0 Free electrons 1 Free protons 0 Free neutrons 0 E6A17 What are the three terminals of a field-effect transistor? 0 Gate 1, gate 2, drain 0 Emitter, base, collector 0 Emitter, base 1, base 2 0 Gate, drain, source 1 E6B01 What is the principal characteristic of a Zener diode? 0 A constant current under conditions of varying voltage 0 A constant voltage under conditions of varying current 1 A negative resistance region 0 An internal capacitance that varies with the applied voltage 0 E6B02 What is the principal characteristic of a tunnel diode? 0 A high forward resistance 0 A very high PIV 0 A negative resistance region 1 A high forward current rating 0 E6B03 What special type of diode is capable of both amplification and oscillation? 0 Point contact 0 Zener 0 Tunnel 1 Junction 0 E6B04 What type of semiconductor diode varies its internal capacitance as the voltage applied to its terminals varies? 0 Varactor 1 Tunnel 0 Silicon-controlled rectifier 0 Zener 0 E6B05 In Figure E6-3, what is the schematic symbol for a varactor diode? 0 8 0 6 0 2 0 1 1 E6B06 What is a common use of a hot-carrier diode? 0 As balanced mixers in FM generation 0 As a variable capacitance in an automatic frequency control circuit 0 As a constant voltage reference in a power supply 0 As VHF and UHF mixers and detectors 1 E6B07 What limits the maximum forward current rating in a junction diode? 0 Peak inverse voltage 0 Junction temperature 1 Forward voltage 0 Back EMF 0 E6B08 Structurally, what are the two main categories of semiconductor diodes? 0 PN junction and metal-semiconductor junction 1 Electrolytic and PN junction 0 CMOS-field effect and metal-semiconductor junction 0 Vacuum and point contact 0 E6B09 What is a common use for point contact diodes? 0 As a constant current source 0 As a constant voltage source 0 As an RF detector 1 As a high voltage rectifier 0 E6B10 In Figure E6-3, what is the schematic symbol for a light-emitting diode? 0 1 0 5 1 6 0 7 0 E6B11 What voltage gain can be expected from the circuit in Figure E6-4 when R1 is 10 ohms and RF is 470 ohms? 0 0.21 0 94 0 47 1 24 0 E6B12 How does the gain of a theoretically ideal operational amplifier vary with frequency? 0 It increases linearly with increasing frequency 0 It decreases linearly with increasing frequency 0 It decreases logarithmically with increasing frequency 0 It does not vary with frequency 1 E6B13 What essentially determines the output impedance of a FET common-source amplifier? 0 The drain resistor 1 The input impedance of the FET 0 The drain supply voltage 0 The gate supply voltage 0 E6B14 What will be the voltage of the circuit shown in Figure E6-4 if R1 is 1000 ohms and RF is 10,000 ohms and 0.23 volts is applied to the input? 0 0.23 volts 0 2.3 volts 0 -0.23 volts 0 -2.3 volts 1 E6B15 What voltage gain can be expected from the circuit in Figure E6-4 when R1 is 1800 ohms and RF is 68 kilohms? 0 1 0 0.03 0 38 1 76 0 E6B16 What voltage gain can be expected from the circuit in Figure E6-4 when R1 is 3300 ohms and RF is 47 kilohms? 0 28 0 14 1 7 0 0.07 0 E6B18 Which of the following circuits is used to recover audio from an FM voice signal? 0 A doubly balanced mixer 0 A phase-locked loop 1 A differential voltage amplifier 0 A variable frequency oscillator 0 E6B19 What is the capture range of a phase-locked loop circuit? 0 The frequency range over which the circuit can lock 1 The voltage range over which the circuit can lock 0 The input impedance range over which the circuit can lock 0 The range of time it takes the circuit to lock 0 E6B20 How are junction diodes rated? 0 Maximum forward current and capacitance 0 Maximum reverse current and PIV 0 Maximum reverse current and capacitance 0 Maximum forward current and PIV 1 E6B21 What is one common use for PIN diodes? 0 As a constant current source 0 As a constant voltage source 0 As an RF switch 1 As a high voltage rectifier 0 E6B22 What type of bias is required for an LED to produce luminescence? 0 Reverse bias 0 Forward bias 1 Zero bias 0 Inductive bias 0 E6B23 What is an operational amplifier? 0 A high-gain, direct-coupled differential amplifier whose characteristics are determined by components external to the amplifier 1 A high-gain, direct-coupled audio amplifier whose characteristics are determined by components external to the amplifier 0 An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit 0 A program subroutine that calculates the gain of an RF amplifier 0 E6B24 What is meant by the term op-amp input-offset voltage? 0 The output voltage of the op-amp minus its input voltage 0 The difference between the output voltage of the op-amp and the input voltage required in the following stage 0 The potential between the amplifier input terminals of the op-amp in a closed-loop condition 1 The potential between the amplifier input terminals of the op-amp in an open-loop condition 0 E6B25 What is the input impedance of a theoretically ideal op-amp? 0 100 ohms 0 1000 ohms 0 Very low 0 Very high 1 E6B26 What is the output impedance of a theoretically ideal op-amp? 0 Very low 1 Very high 0 100 ohms 0 1000 ohms 0 E6B27 What is a phase-locked loop circuit? 0 An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator 0 An electronic circuit also known as a monostable multivibrator 0 An electronic servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator 1 An electronic circuit consisting of a precision push-pull amplifier with a differential input 0 E6B28 What functions are performed by a phase-locked loop? 0 Wide-band AF and RF power amplification 0 Comparison of two digital input signals, digital pulse counter 0 Photovoltaic conversion, optical coupling 0 Frequency synthesis, FM demodulation 1 E6C01 What is the recommended power supply voltage for TTL series integrated circuits? 0 12 volts 0 1.5 volts 0 5 volts 1 13.6 volts 0 E6C02 What logic state do the inputs of a TTL device assume if they are left open? 0 A high-logic state 1 A low-logic state 0 The device becomes randomized and will not provide consistent high or low-logic states 0 Open inputs on a TTL device are ignored 0 E6C03 What level of input voltage is high in a TTL device operating with a 5-volt power supply? 0 2.0 to 5.5 volts 1 1.5 to 3.0 volts 0 1.0 to 1.5 volts 0 -5.0 to -2.0 volts 0 E6C04 What level of input voltage is low in a TTL device operating with a 5-volt power-supply? 0 -2.0 to -5.5 volts 0 2.0 to 5.5 volts 0 0.0 to 0.8 volts 1 -0.8 to 0.4 volts 0 E6C05 What is NOT a major advantage of CMOS over other devices? 0 Small size 0 Low power consumption 0 Low cost 0 Differential output 1 E6C06 Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply? 0 Larger bypass capacitors are used in CMOS circuit design 0 The input switching threshold is about two times the power supply voltage 0 The input switching threshold is about one-half the power supply voltage 1 Input signals are stronger 0 E6C07 In Figure E6-5, what is the schematic symbol for an AND gate? 0 1 1 2 0 3 0 4 0 E6C08 In Figure E6-5, what is the schematic symbol for a NAND gate? 0 1 0 2 1 3 0 4 0 E6C09 In Figure E6-5, what is the schematic symbol for an OR gate? 0 2 0 3 1 4 0 6 0 E6C10 In Figure E6-5, what is the schematic symbol for a NOR gate? 0 1 0 2 0 3 0 4 1 E6C11 In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)? 0 2 0 4 0 5 1 6 0 E6D01 How is the electron beam deflected in a vidicon? 0 By varying the beam voltage 0 By varying the bias voltage on the beam forming grids inside the tube 0 By varying the beam current 0 By varying electromagnetic fields 1 E6D02 What is cathode ray tube (CRT) persistence? 0 The time it takes for an image to appear after the electron beam is turned on 0 The relative brightness of the display under varying conditions of ambient light 0 The ability of the display to remain in focus under varying conditions 0 The length of time the image remains on the screen after the beam is turned off 1 E6D03 If a cathode ray tube (CRT) is designed to operate with an anode voltage of 25,000 volts, what will happen if the anode voltage is increased to 35,000 volts? 0 The image size will decrease and the tube will produce X-rays 1 The image size will increase and the tube will produce X-rays 0 The image will become larger and brighter 0 There will be no apparent change 0 E6D04 Exceeding what design rating can cause a cathode ray tube (CRT) to generate X-rays? 0 The heater voltage 0 The anode voltage 1 The operating temperature 0 The operating frequency 0 E6D05 Which of the following is true of a charge-coupled device (CCD)? 0 Its phase shift changes rapidly with frequency 0 It is a CMOS analog-to-digital converter 0 It samples an analog signal and passes it in stages from the input to the output 1 It is used in a battery charger circuit 0 E6D06 What function does a charge-coupled device (CCD) serve in a modern video camera? 0 It stores photogenerated charges as signals corresponding to pixels 1 It generates the horizontal pulses needed for electron beam scanning 0 It focuses the light used to produce a pattern of electrical charges corresponding to the image 0 It combines audio and video information to produce a composite RF signal 0 E6D07 What is a liquid-crystal display (LCD)? 0 A modern replacement for a quartz crystal oscillator which displays its fundamental frequency 0 A display that uses a crystalline liquid to change the way light is refracted 1 A frequency-determining unit for a transmitter or receiver 0 A display that uses a glowing liquid to remain brightly lit in dim light 0 E6D08 What material property determines the inductance of a toroidal inductor with a 10-turn winding? 0 Core load current 0 Core resistance 0 Core reactivity 0 Core permeability 1 E6D09 By careful selection of core material, over what frequency range can toroidal cores produce useful inductors? 0 From a few kHz to no more than several MHz 0 From 100 Hz to at least 1000 MHz 1 From 100 Hz to no more than 3000 kHz 0 From a few hundred MHz to at least 1000 GHz 0 E6D10 What is one important reason for using powdered-iron toroids rather than ferrite toroids in an inductor? 0 Powdered-iron toroids generally have greater initial permeabilities 0 Powdered-iron toroids generally have better temperature stability 1 Powdered-iron toroids generally require fewer turns to produce a given inductance value 0 Powdered-iron toroids are easier to use with surface-mount technology 0 E6D11 What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of transistorized HF amplifiers? 0 Electrolytic capacitors 0 Butterworth filters 0 Ferrite beads 1 Steel-core toroids 0 E6D12 What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor? 0 Toroidal cores contain most of the magnetic field within the core material 1 Toroidal cores make it easier to couple the magnetic energy into other components 0 Toroidal cores exhibit greater hysteresis 0 Toroidal cores have lower Q characteristics 0 E6D13 How many turns will be required to produce a 1-mH inductor using a ferrite toroidal core that has an inductance index (A L) value of 523 millihenrys/1000 turns? 0 2 turns 0 4 turns 0 43 turns 1 229 turns 0 E6D14 How many turns will be required to produce a 5-microhenry inductor using a powdered-iron toroidal core that has an inductance index (A L) value of 40 microhenrys/100 turns? 0 35 turns 1 13 turns 0 79 turns 0 141 turns 0 E6D15 What type of CRT deflection is better when high-frequency waves are to be displayed on the screen? 0 Electromagnetic 0 Tubular 0 Radar 0 Electrostatic 1 E6D16 Which is NOT true of a charge-coupled device (CCD)? 0 It uses a combination of analog and digital circuitry 0 It can be used to make an audio delay line 0 It can be used as an analog-to-digital converter 1 It samples and stores analog signals 0 E6D17 What is the principle advantage of liquid-crystal display (LCD) devices? 0 They consume low power 1 They can display changes instantly 0 They are visible in all light conditions 0 They can be easily interchanged with other display devices 0 E6D18 What is one important reason for using ferrite toroids rather than powdered-iron toroids in an inductor? 0 Ferrite toroids generally have lower initial permeabilities 0 Ferrite toroids generally have better temperature stability 0 Ferrite toroids generally require fewer turns to produce a given inductance value 1 Ferrite toroids are easier to use with surface mount technology 0 E6E01 For single-sideband phone emissions, what would be the bandwidth of a good crystal lattice band-pass filter? 0 6 kHz at -6 dB 0 2.1 kHz at -6 dB 1 500 Hz at -6 dB 0 15 kHz at -6 dB 0 E6E02 For double-sideband phone emissions, what would be the bandwidth of a good crystal lattice band-pass filter? 0 1 kHz at -6 dB 0 500 Hz at -6 dB 0 6 kHz at -6 dB 1 15 kHz at -6 dB 0 E6E03 What is a crystal lattice filter? 0 A power supply filter made with interlaced quartz crystals 0 An audio filter made with four quartz crystals that resonate at 1-kHz intervals 0 A filter with wide bandwidth and shallow skirts made using quartz crystals 0 A filter with narrow bandwidth and steep skirts made using quartz crystals 1 E6E04 What technique is used to construct low-cost, high-performance crystal ladder filters? 0 Obtain a small quantity of custom-made crystals 0 Choose a crystal with the desired bandwidth and operating frequency to match a desired center frequency 0 Measure crystal bandwidth to ensure at least 20% coupling 0 Measure crystal frequencies and carefully select units with a frequency variation of less than 10% of the desired filter bandwidth 1 E6E05 Which of the following factors has the greatest effect in helping determine the bandwidth and response shape of a crystal ladder filter? 0 The relative frequencies of the individual crystals 1 The DC voltage applied to the quartz crystal 0 The gain of the RF stage preceding the filter 0 The amplitude of the signals passing through the filter 0 E6E06 What is the piezoelectric effect? 0 Physical deformation of a crystal by the application of a voltage 1 Mechanical deformation of a crystal by the application of a magnetic field 0 The generation of electrical energy by the application of light 0 Reversed conduction states when a P-N junction is exposed to light 0 E6E07 What is the characteristic impedance of circuits in which MMICs are designed to work? 0 50 ohms 1 300 ohms 0 450 ohms 0 10 ohms 0 E6E08 What is the typical noise figure of a monolithic microwave integrated circuit (MMIC) amplifier? 0 Less than 1 dB 0 Approximately 3.5 to 6 dB 1 Approximately 8 to 10 dB 0 More than 20 dB 0 E6E09 What type of amplifier device consists of a small pill sized package with an input lead, an output lead and 2 ground leads? 0 A junction field-effect transistor (JFET) 0 An operational amplifier integrated circuit (OAIC) 0 An indium arsenide integrated circuit (IAIC) 0 A monolithic microwave integrated circuit (MMIC) 1 E6E10 What typical construction technique do amateurs use when building an amplifier for the microwave bands containing a monolithic microwave integrated circuit (MMIC)? 0 Ground-plane "ugly" construction 0 Microstrip construction 1 Point-to-point construction 0 Wave-soldering construction 0 E6E11 How is the operating bias voltage supplied to a monolithic microwave integrated circuit (MMIC) that uses four leads? 0 Through a resistor and RF choke connected to the amplifier output lead 1 MMICs require no operating bias 0 Through a capacitor and RF choke connected to the amplifier input lead 0 Directly to the bias-voltage (VCC IN) lead 0 E6E12 How is the DC power from a voltage source fed to a monolithic microwave integrated circuits (MMIC)? 0 Through a coupling capacitor 0 Through a PIN diode 0 Through a silicon-controlled rectifier 0 Through a resistor 1 E6E13 What supply voltage do monolithic microwave integrated circuits (MMIC) amplifiers typically require? 0 1 volt DC 0 12 volts DC 1 20 volts DC 0 120 volts DC 0 E6E14 What is the most common package for inexpensive monolithic microwave integrated circuit (MMIC) amplifiers? 0 Beryllium oxide packages 0 Glass packages 0 Plastic packages 1 Ceramic packages 0