Description : What type of source is typically used in low-data-rate digital applications?
Last Answer : LED.
Description : For what types of applications are APDs generally used?
Last Answer : For high-data-rate applications and for low- or moderate-data rate applications where receivers with extremely low sensitivities are required.
Description : Why would a laser diode be used in a low-data-rate digital application?
Last Answer : When extremely high transmitter output powers are required.
Description : Digital computers are generally used for what purposes?
Last Answer : Business and scientific data processing
Description : Power for the electronic digital multimeter is normally supplied by what internal power source?
Last Answer : Rechargeable batteries.
Description : Why is it generally only necessary to refer to point-to-point data links when discussing the process of fiber optic system design?
Last Answer : Because fiber optic systems that incorporate complex architectures can be simplified into a collection of point-to-point data links before beginning the design process.
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.
Description : What method for encoding digital data enables you to store more data in less space by limiting the distance between pulses on a hard disk?
Last Answer : Run length-limited (RLL) encoding.
Description : Older, single-sided, single-density floppy disk drives would probably use what method for encoding digital data onto the floppy disk?
Last Answer : Frequency-modulation encoding.
Description : What are the three most popular methods for encoding digital data onto magnetic disks?
Last Answer : a. Frequency modulation (FM). b. Modified frequency modulation (MFM). c. Run length limited (RLL).
Description : Digital magnetic tape recorders used to store and retrieve digital data fall into what three categories?
Last Answer : a. Computer-compatible digital tape recorders. b. Telemetry digital tape recorders. c. Instrumentation digital tape recorders
Description : Which digital data encoding method helps overcome a tape recorder’s low-frequency response problems by recording two logic levels for each incoming data bit?
Last Answer : Bi-phase level encoding.
Description : Which method of digital data encoding does NOT return the tape to neutral between pulses but, instead, saturates the tape positively or negatively as the incoming data changes between zero and one?
Last Answer : Non-return-to-zero (NRZ) encoding.
Description : Which digital data encoding method records a digital one as a positive pulse and a digital (zero) as a negative pulse and returns the tape to neutral between pulses?
Last Answer : Return-to-zero (RZ) encoding.
Description : Which digital data tape encoding method presets the magnetic tape to all zeros and then records digital ones onto the tape?
Last Answer : Return-to-bias (RB) encoding.
Description : Which of the eight methods for encoding digital data onto magnetic tape is most widely used because it’s accurate, simple, and reliable?
Description : What format of digital tape recording is normally used to record instrumentation or telemetry data?
Last Answer : Serial digital magnetic tape recording.
Description : What format of digital tape recording takes a serial input stream of data pulses, breaks them up, and records them on more than one data track?
Last Answer : Serial-parallel digital magnetic tape recording.
Description : What format of digital tape recording is normally used to store computer data?
Last Answer : Parallel digital magnetic tape recording.
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 type of applications were most third generation computer systems designed to accomplish?
Last Answer : Both scientific and business data processing applications.
Description : By what two means can the data contained on a source document be converted into a machinereadable form for processing?
Last Answer : By either direct or indirect means.
Description : What type of antennas are generally used at earth terminals?
Last Answer : Large, high-gain parabolic antennas.
Description : Ferrite devices are useful in microwave applications because they possess what properties?
Last Answer : Magnetic properties and high resistance
Description : In applications where electronic waveforms are displayed on a CRT screen, the input signal is normally applied to what CRT element?
Last Answer : The vertical-deflection plate.
Description : How is the applications software compatibility problem overcome
Last Answer : Some software comes in several versions so it can run under several different operating systems.
Description : Why is the availability of applications software for a particular operating system critical?
Last Answer : Because, to use applications software, it must be compatible with the operating system.
Description : List two reasons why fusion splicing is one of the most popular splicing techniques in commercial applications.
Last Answer : . The small size of the fusion splice and the development of automated fusion-splicing machines.
Description : Why are LEDs preferred over laser diodes for low- and moderate-frequency analog applications?
Last Answer : LEDs require less complex circuitry than lasers.
Description : What five characteristics do applications using plastic clad silica (PCS) and all-plastic fibers typically have?
Last Answer : High NA, low bandwidth, tight bend radius, short length, and low cost.
Description : What multimode graded-index fiber offers the best overall performance for most applications?
Last Answer : 62.5/125 mm multimode graded-index fiber.
Description : How many systems dealing with accounting applications have been widely accepted?
Last Answer : Six.
Description : What does the liquid crystal display require for computer applications?
Last Answer : An external light source, called a backlight.
Description : The use of antibiotics can be based on either the clinical course of a patient without the benefit of well-defined microbiologic data (empiric therapy), or targeted at ... which polymicrobial infection is identified, specifically-directed treatment for the predominant organism is satisfactory
Last Answer : Answer: c The use of empiric therapy without the benefit of well-defined microbiologic data is appropriate when there is sufficient clinical evidence to support the diagnosis such that it would ... components of the infection if the body site is such that these microorganisms may be present
Description : Which types of LEDs are the preferred optical sources for short-distance, low-data-rate fiber optic systems?
Last Answer : SLEDs and ELEDs.
Description : Private networks can be a richer source of evidence than the Internet because: a. They retain data for longer periods of time. b. Owners of private networks are more cooperative with law enforcement. c. Private networks contain a higher concentration of digital evidence. d. All of the abov
Last Answer : c. Private networks contain a higher concentration of digital evidence.
Description : Private networks can be a richer source of evidence than the Internet because: a. They retain data for longer periods of time. b. Owners of private networks are more cooperative with law enforcement. c. Private networks contain a higher concentration of digital evidence. d. All of the above.
Description : Private networks can be a richer source of evidence than the Internet because: a. They retain data for longer periods of time. b. Owners of private networks are more cooperative with law enforcement. c. Private networks contain a higher concentration of digital Evidences d. None of the above.
Last Answer : c. Private networks contain a higher concentration of digital Evidences
Description : Private networks can be a richer source of evidence than the Internet because: A. They retain data for longer periods of time. B. Owners of private networks are more cooperative with law enforcement. C. Private networks contain a higher concentration of digital evidence. D. All the above.
Last Answer : C. Private networks contain a higher concentration of digital evidence.
Description : A sound wave that is reflected back toward the source is known as what type of sound?
Last Answer : Echo.
Description : The source and drain of an N-channel JFET are made of what type of material?
Last Answer : N-type material.
Description : Which type of optical source tends to operate at higher drive currents to produce light?
Last Answer : Laser.
Description : Which type of optical source usually lacks reflective facets and in some cases are designed to suppress reflections back into the active region?
Description : What type of antenna has all elements connected to the same energy source?
Last Answer : Driven Array.
Description : A radiating source that radiates energy equally in all directions is known as what type of radiator?
Last Answer : Isotropic radiator.
Description : A radiating source that radiates energy stronger in one direction than another is known as what type of radiator?
Last Answer : Anisotropic radiator.
Description : Is the drive circuitry generally more complex for an LED or a laser diode? Why?
Last Answer : For a laser diode. The laser diode transmitter generally contains output power control circuitry and may contain a TE cooler and some circuitry associated with the TE cooler.
Description : Why is detector saturation not generally a problem in fiber optic communications systems?
Last Answer : Because fiber optic communications systems operate at low optical power levels.
Description : Will fiber coupling loss generally increase or decrease if the mode field diameter of a single mode fiber is decreased?
Last Answer : Increase.