Description : List the two principal optical detectors used in fiber optic systems.
Last Answer : The semiconductor positive-intrinsic-negative (PIN) photodiode and avalanche photodiode (APD).
Description : Why can phase-modulated signals be detected by fm detectors?
Last Answer : Because of the incidental frequency shift that is caused while phase-shifting a carrier wave that is similar to fm modulation.
Description : Optical detectors are square-law devices because they respond to _____ rather than amplitude ∙ a. Intensity ∙ b. Light ∙ c. Density ∙ d. Photon
Last Answer : a. Intensity
Description : What is the basic principle of a magnetic amplifier?
Last Answer : change in inductance in a series LR circuit causes a change in true power.
Description : What the three basic components make up the typical magnetic amplifier?
Last Answer : Two saturable reactors and a transformer.
Description : What are the four basic parts of a magnetic tape recorder's tape transport system?
Last Answer : a. Tape reeling system. b. Tape speed control system. c. Electronic subsystem. d. Basic enclosure.
Description : Magnetic tape is made of what three basic materials?
Last Answer : a. Base material. b. Coating of magnetic oxide particles. c. Glue that bonds the particles to the base.
Description : What are the two types of circuit protection devices?
Last Answer : Fuses and circuit breakers
Description : What are the three types of circuit control devices?
Last Answer : Switches, solenoids, and relays.
Description : What two types of record and reproduce electronics are used by magnetic tape recorders?
Last Answer : . a. Direct record (AM). b. Frequency modulation (FM).
Description : Your activity stores its magnetic tape in an area where the temperature is 100º F. What two types of environmental damage could occur that would make these tapes unusable?
Last Answer : Head-to-tape sticking and layer-to-layer adhesion
Description : Which of the two types of magnetic tape is used to record audio and instrumentation type signals in the VLF to 2.5MHz frequency range?
Last Answer : Analog magnetic tape.
Description : The magic-T is composed of what two basic types of T junctions?
Last Answer : E-type and H-type.
Description : What are the two basic types of T junctions?
Description : The two basic types of voltage regulators are ___ and ___
Last Answer : Series and shunt.
Description : What are the two basic types of transmitters?
Last Answer : Keyed oscillator and power-amplifier chain.
Last Answer : . Keyed oscillator and power-amplifier chain.
Description : The two basic types of voltage regulators are _______ and _______.
Description : What are the two basic types of single mode step-index fibers?
Last Answer : Matched-clad and depressed-clad.
Description : What are the two basic types of preamplifiers used in fiber optic receivers?
Last Answer : The high-impedance amplifier and the transimpedance amplifier.
Description : What are the two basic types of tape buffering reeling systems?
Last Answer : a. Spring-tension buffering systems. b. Vacuum-column buffering systems.
Description : What are the two basic types of optical fibers?
Last Answer : Multimode and single mode fibers.
Description : What are the two basic types of alternators?
Last Answer : Rotating armature and rotating field.
Description : If magnetic tape is stored in areas with temperature and humidity extremes, what are three types of tape damage that may occur?
Last Answer : Oxide shedding, layer-to-layer sticking, and tape deformation.
Description : What are four types of tape errors that can degrade a magnetic recording system’s performance?
Last Answer : Signal dropout, noise, skew, and level. Dropout is the most common.
Description : In digital magnetic tape recording, the series of recorded digital pulses can represent what three types of data?
Last Answer : a. Data used by digital computers. b. Pulsed squarewave signals. c. Digitized analog waveforms.
Description : What types of diagrams are the most convenient from which to learn the basic Functions of a circuit?
Last Answer : Block or single-line diagram.
Description : What are the three basic LED types?
Last Answer : Surface-emitting LEDs (SLEDs), edge-emitting LEDs (ELEDs)
Description : What are the four basic transmitter types?
Last Answer : Am, fm, cw, ssb.
Description : What are the three basic types of ac motors?
Last Answer : Series, synchronous, induction.
Description : List basic types of programmable logic devices.
Last Answer : 1. . Read only memory 2. . Programmable logic Array 3. . Programmable Array Logic
Description : What are the two most common semiconductor materials used in electronic and electro-optic devices?
Last Answer : Silicon and gallium arsenide.
Description : An error signal is the difference between what two quantities fed to the CT (error detector)?
Last Answer : Input signal and feedback.
Description : Ferrite devices are useful in microwave applications because they possess what properties?
Last Answer : Magnetic properties and high resistance
Description : What is the name given to a variety of rotary electromechanical, position sensing devices?
Last Answer : The synchro.
Description : What are the three networks used for frequency determining devices?
Last Answer : RC, LC, and crystal
Description : Early analog computers were what type of devices?
Last Answer : Mechanical or electromechanical.
Description : What is the primary advantage of bulk-effect devices over normal pn-junction semiconductors?
Last Answer : Larger microwave power outputs.
Description : Computer-aided layout is used to prepare _______ devices.
Last Answer : Complex.
Description : Why are disk storage devices popular?
Last Answer : Largely because of their direct access capabilities.
Last Answer : Largely because of their direct access capabilities
Description : Whenever data is transferred between devices, it involves the exchange of prearranged signals; what is this process called?
Last Answer : Handshaking.
Description : How are circuits protections devices connected to the circuit they are intended to protect and why are they connected in this way?
Last Answer : In series, so total current will be stopped when the device opens.
Description : Why are digital multimeters well suited for testing sensitive devices?
Last Answer : The current flow through the component is limited to 1 milliamp.
Description : Why do electronic devices use amplifiers?
Last Answer : To amplify the input signal to a usable level.
Description : Why are shaded-pole motors used to drive only very small devices?
Last Answer : They have very weak starting torques.
Description : In the output of an ac error detector, what indicates the (a) direction and (b) amount of control necessary for correspondence?
Last Answer : (a) Phase. (b) Amplitude.
Description : When the input and output wipers of a balanced potentiometer are in the same angular position, what is the value of the error voltage?
Last Answer : Zero.
Description : Error-rate damping is effective because the circuitry has the capability of ______________the amount of overshoot before it happens.
Last Answer : Anticipating
Description : Which performance parameter is the minimum amount of optical power required to achieve a specific bit-error rate (BER) in digital systems or a given signal-to-noise ratio (SNR) in analog systems?
Last Answer : Receiver sensitivity.