____ is used to keep voltage spikes, caused by switching large currents on and off, from “talking” to the electronic control section of the circuit.
a. Isolation
b. Induction
c. Optoisolation
d. Mechanical isolation
c. Optoisolation
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Find the resultant of the three-force system shown in Figure 12.28 and locate it with respect to point A.
 FIGURE 1.png)
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Chlorofluorocarbons (CFCs) are highly unstable
Indicate whether the statement is true or false.
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In FCAW-S, the flux inside the wire core contains ingredients that _____
a. cause arc flutter b. oxidize the weld c. generate a shielding gas d. prevent slag from forming
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The solder most commonly used on low-pressure copper fittings is made from _____
a. 100% lead b. 50% tin/50% silver c. 95% tin/5% antimony d. 45% silver/25% zinc/30% copper
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