Description : What material is applied to electronic assemblies to prevent damage from corrosion, moisture, and stress?
Last Answer : Conformal coating
Description : Before servicing the device indicated as 'A' in panels #1 and #3 of the illustration, the device labeled 'CT' must __________. EL-0003 A. have the disconnected leads taped to prevent ... D. have one lead grounded to discharge static electricity for the prevention of damage to electronic components
Last Answer : Answer: C
Description : When a solid-state component of an electronic circuit is mounted to a metallic mass, the general purpose of that mass is to ____________. A. prevent vibration damage to delicate components B. prevent ... damage to solid-state components C. dissipate stray magnetic currents D. act as a heat sink
Last Answer : Answer: D
Description : When troubleshooting electronic equipment, you should use a high impedance multimeter ________________. A. to prevent excess current flow through the meter that would damage it B. for AC measurements only ... being tested D. so as not to load down the circuit and obtain erroneous voltage readings
Description : Can I ground myself outside by wearing electrostatic discharge (ESD) footwear?
Last Answer : ESD shoes are A. ESD shoes are primarily designed for dischargin primarily designed for discharging static electrici g static electricity but to a degree they ty but to a degree they ground ... sit on any synthetic material. The ESD industry uses dissipative grounding to prevent a rapid discharge
Description : Which of the following has acquired the theatrical telecast rights for cricket matches of the Indian Premier League (IPL) 2010 and 2019 for Rs 330 crore recently? a. Entertainment and Sports Direct (ESD) ... Services (SIS) c. Triplecom Media d. Fox Sports International (FSI) e. Big Entertainment
Last Answer : a. Entertainment and Sports Direct (ESD)
Description : ESD stands for
Last Answer : ESD stands for Electro static Discharge
Description : You notice steps in the tape pack such as those in figure 2-3. What causes this and how does it damage the magnetic tape?
Last Answer : Pack slip. It's caused by loosely wound tape on a reel that is exposed to excessive vibration or heat. The vibration or heat causes the tape to shift, causing steps in the tape pack. The uneven tape will then rub against the reel's sides and the recorder's tape guides.
Description : List four rules you should follow when storing magnetic tape to protect it from damage.
Last Answer : a. Make sure the tape is wound properly on the reel hub, b. store tapes vertically, c. keep storage area at right temperature and humidity, d. store away from equipment that generates stray magnetic fields.
Description : Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components? A. Ambient temperature should be as high as possible to drive ... is kept low. D. A reduced ambient temperature causes a corresponding reduced service life.
Last Answer : Answer: B
Description : List the types of fiber optic components considered part of a fiber optic cable plant.
Last Answer : Optical fiber cables, connectors, splices, mounting panels, jumper cables, and other passive components.
Description : List five system design parameters considered when system designers choose the system operational wavelength and link components.
Last Answer : Launch power, connection losses, bandwidth, cost, and reliability
Description : Is it possible for a person to have such sensitive hears that even low level everyday sounds like converersation,TV at low volume or riding in a car, can damage the ear and hearing? Causing a raise in ... would be helpful. I seem to be having this problem and none of the doctors have any answers ?
Last Answer : answer:Have you seen a trained Audiologist for hearing test on all frequencies? That might give you some clues. And I assume that one of the Doctors was an ENT specialist? How old are you? ... . Tinnitus cause is still a medical mystery, I believe. (Shilolo, are you listening?) hearing sensitivity
Description : Which of the following precautions should be taken when troubleshooting various power circuits using a common solenoid-type mechanical voltage tester (wiggins)? A. Never use this tester on circuits greater ... voltage expected in the circuit in order to prevent damage from an off-scale reading.
Last Answer : Answer: A
Description : Which are more sensitive to alignment errors, single mode or multimode fibers?
Last Answer : Single mode.
Description : Why do earth terminals require highly sensitive receivers?
Last Answer : To overcome satellite transmitter low power and permit extraction of the desired information from the received signal.
Description : The cutoff wavelength of matched-clad and depressed-clad single mode fibers varies according to the fiber's radius of curvature and length. The cutoff wavelength of which single mode fiber type is more sensitive to length
Last Answer : Depressed-clad.
Description : What is the only use for the voltage sensitive meter movement?
Last Answer : High-voltage measurement.
Description : How is it possible to use a current sensitive meter movement to measure voltage?
Last Answer : Since the resistance of a meter movement remains the same as the pointer is deflected, the amount of current through the movement is proportional to the voltage applied. Therefore, only the scale of the movement must be changed.
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 : To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should _______. A. ground the board B. avoid reversing the polarity of the leads C. isolate sensitive components with heat sinks D. all of the above
Description : Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when (A) Extracting solvent is cheaply & abundantly available ... very high (D) One of the liquid components has very high affinity towards the solvent
Last Answer : (D) One of the liquid components has very high affinity towards the solvent
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 : How is board damage caused by technicians?
Last Answer : Repairs by untrained personnel and technicians using improper tools.
Description : When does most printed circuit board damage occur?
Last Answer : During disassembly or repair.
Description : How do the tape guides on a tape reeling system protect the tape from damage during operation?
Last Answer : They keep the tape straight with respect to both the supply and take-up reels and the magnetic heads.
Description : When the relative humidity is below 10%, what happens to magnetic tape and parts of a tape recorder that could cause environmental damage?
Last Answer : Dirt build-up caused by static electricity.
Description : What six types of environmental damage can occur to tapes in storage when the ideal temperature and humidity ranges are exceeded?
Last Answer : Tape deformation, oxide shedding, head-to-tape sticking, layer to-layer sticking, dirt build-up, and excessive tape and head wear.
Description : Environmental damage to magnetic tape can occur when the tape is stored in an area that exceeds what ideal temperature and humidity ranges?
Last Answer : Ideally, use and store tape at 60 to 80º F and at 40 to 60% relative humidity.
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 structurally large, low-resistance conductor is connected in parallel with the meter movement to prevent damage?
Last Answer : Shunt.
Description : Which of the following represents the accepted method of cleaning dust and foreign particles from electrical equipment while limiting damage to electric components? A. Carefully wiping off the components ... the components. D. Using carbon tetrachloride as a cleaning solvent to clean the components.
Description : What are the two most common semiconductor materials used in electronic and electro-optic devices?
Last Answer : Silicon and gallium arsenide.
Description : Solder used in electronic repair is normally an alloy of what two elements?
Last Answer : Tin and lead.
Description : What type of flux must be used in all electrical and electronic soldering?
Last Answer : Noncorrosive, nonconductive rosin fluxes.
Description : What electronic function made the transistor famous?
Last Answer : Amplification.
Description : What test equipment is designed to generate, modify, or measure a range of parameters of electronic functions of a specific nature required to test a single system or equipment?
Last Answer : Special-purpose electronic test equipment.
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 : What characteristic(s) of radiated energy is (are) altered to achieve electronic scanning?
Last Answer : Frequency or phase.
Description : For power measurements, what advantage does an electronic wattmeter have over an electrodynamic wattmeter?
Last Answer : Electronic wattmeters are capable of measuring high-fequency signals.
Description : Technological advancement is measured by what, in the electronic computer world?
Last Answer : Generations.
Description : In electronic computers, vacuum tubes were replaced by transistors and transistors have been replaced by what device?
Last Answer : Integrated circuits.
Description : What type(s) of flux should never be used on electronic equipment?
Last Answer : Chloride or (acid) and organic.
Description : What test equipment continuously monitors electronic systems?
Last Answer : On-line.
Description : What is the most common source of heat in electronic soldering?
Last Answer : Conductive-type soldering iron.
Description : To what standards should a technician restore electronic assemblies?
Last Answer : Manufacturer's standards.
Description : The varactor is a pn junction that acts as what type of electronic device?
Last Answer : Variable capacitor.
Description : In what publication would you find guidelines for performance of military electronic parts?
Last Answer : Military Standards.
Description : What problems were evident about military electronic systems during World War II?
Last Answer : Size, weight, and power consumption.
Description : What type of interface electronics is used in many naval electronic warfare systems?
Last Answer : NTDS interface.