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Solder: Quiz


Question 1: Since the properties of lead-free solders are not as thoroughly known, they may therefore be considered less desirable for critical applications, like certain ________ or medical projects.
BiotechnologyNuclear technologyAerospaceAerospace engineering

Question 2: two solid copper ________ twisted together.

Question 3: ________/lead solders, also called soft solders, are commercially available with tin concentrations between 5% and 70% by weight.

Question 4: In production of ________, devitrifying solders based on PbO-B2O3-ZnO are used.
Organic LEDCathode ray tubePlasma displayLiquid crystal display

Question 5: They can be mixed with water or alcohol to form a paste for easy application, or with dissolved ________ or other suitable binder for adhering to the surfaces until being melted.
CorditeNitroglycerinSmokeless powderNitrocellulose

Question 6: Due to concerns over ________ and hazardous waste disposal, the electronics industry has been gradually shifting from rosin flux to water-soluble flux, which can be removed with deionised water and detergent, instead of hydrocarbon solvents.
Air pollutionSmogRoadway air dispersion modelingParticulate

Question 7: At a ________ composition, the liquid solder solidifies at a single temperature.
IronEutectic systemMercury (element)Gold

Question 8: [3] ________ use solder joints to mount components and create a circuit, also replacing the use of solid solder with solder paste.
Gerber FileSurface-mount technologyPrinted circuit boardSchematic capture

Question 9: The two principal types of flux are acid flux, used for metal mending and plumbing, and ________ flux, used in electronics, where the corrosiveness of acid flux and vapours released when solder is heated would risk damaging delicate circuitry.
Glazing agentWaxE numberRosin

Question 10: for gaining access to the chip for failure analysis or ________, is best done by shearing; if this is too risky, the cover is polished away instead.
Computer softwareEmbedded systemClean room designReverse engineering


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