Describe the purpose(s) of the solder mask layer.
What will be an ideal response?
The solder mask controls or indicates where the solder will be placed on the printed circuit board pads during a process called wave soldering. This solder will only connect the components to the solder pads. When making only one or two boards with a simple design a solder mask may not be needed. Additionally, the solder mask adds corrosion protection to the printed circuit board traces.
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An interest rate of 2% per month is the same as:
(a) 24% per year, compounded monthly (b) a nominal 24% per year, compounded monthly (c) an effective 24% per year, compounded monthly (d) Both (a) and (b)
When should gauges be installed on small critically charged systems?
A) Whenever the system is checked B) Only when other diagnostic means have been exhausted C) Routinely, at least every year D) Monthly to insure the charge is still correct
Selenium is a(n) _____.
A. conductor B. insulator C. semiconductor
______________________________ is classified by series, according to the metal or metals the aluminum is alloyed with and whether the aluminum is heat treated.
Fill in the blank(s) with the appropriate word(s).