Complete Questions and Guide Answers
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1. What do performance classes reflect?
Answer: Progressive increases in sophistication, functional perfor- mance, and frequency/intensity of inspection or
stress testing
2. What are the three performance classes?
Answer: 1-General Electronics 2-Dedicated Service 3-High reliability
3. Who is the end user?
Answer: The end user is the individual or agency that contracts the printed board or assembly to be designed and
manufactured
4. Who determines the class of a product?
Answer: The end user
5. What would be in class 3 performance?
Answer: Military, medical, etc.
6. What is ambient temperature?
,Answer: The surrounding environment that comes into contact with your product
7. What do producibility levels tell us?
Answer: Increasing complexity of tooling, materials, and processing. Yields increase as costs decrease, etc.
8. What increases with each producibility level?
Answer: Sophisitication
9. What is the zaxis aspect ratio?
Answer: Ratio between the nominal thickness of the board and the smallest drill size.
10. What is the most important special consideration in terms of electrical func- tionality
that a designer must consult the EE?
Answer: Special keep out or keep in areas of the board.
11. Where should high frequency circuits be placed?
Answer: NEar the connector
12. Where should filtering caps be placed?
Answer: Near the source of power/gnd (at the connector)
13. What is least important to route in analog circuits?
Answer: Power and ground
14. What is a major consideration for component placement?
Answer: Willbackwards compati- bility be necessary?
, 15. What is Ohm's law?
Answer: V=IR
16. What is an important basic rule for a designer of a board?
Answer: Terminate unused logic pins with a pull-down or pull-up resistor.
17. What product safety testing regards flame retardants?
Answer: UL 94
18. How thick is half ounce copper?
Answer: 0.7 mils (17 um thick)
19. What is the subtractive process?
Answer: Unwanted copper is etched away
20. What is the additive process?
Answer: Only wanted copper is added to the board
21. What must happen immediately after drilling the holes in the boards?
Answer: Hole deburring