IPC CID+ Questions and Answers (100% Correct Answers) Already Graded A+

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IPC CID+ Questions and Answers (100%
Correct Answers) Already Graded A+


Quiz: The board material has significant influence on the electrical perfo
rmance of the circuit from what two effects?⼀
Answer: dielectric constant and the loss tangent


Quiz: What are the 4 types of build-up multilayers?⼀
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Answer: Piercing post, Sequentially built-
up multilayer, Passive substrate, Filled via sequential co-
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laminated substrate


Quiz: The temperature at which anamorphous polymer changes fr
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om being a hard and relatively-
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brittle condition to be in a viscous or rubbery state
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Answer: Glass transition temperature (Tg)
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Quiz:
Affects dimensional stability and changes the electrical
characteristic in the material which can cause potential difficultie
s in assembly⼀Answer: Moisture absorption


Quiz: What are the 3 general methods of plating material on PCB
s?⼀ Answer: Immersion, electroless, and electrolytic


Quiz:
What are the benefits of metallic coatings / final(surface) finish
?⼀ Answer: Corrosion prevention, Improved long-term solderability

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Quiz:
Simplest of the wet processes; involves a simple galvan
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ic replacement reaction; the more noble metal in the solution pi cks
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up

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electrons from the less noble metal immersed in the solution and plates o ut
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⼀Answer: Immersion Plating
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Quiz: Why would you use immersion plating?⼀
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Answer: The thickness is limited to a very thin coating as it is a simp le
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replacement reaction -




Quiz: Why is Immersion finishes more beneficial than HASL?⼀
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Answer: Immersion has a flatter base for attachment
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Quiz: What are the assembly challenges/problems with HASL process?
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Answer: Coplanarity / solder thickness varies, solder crowning, less unif WS - WS WS WS - - WS -



ormity
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Quiz:
Stencil fits flat on pad, opening is smaller than the land patte
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rn in all dimensions⼀Answer: Gasketing
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Quiz: What is the problem with gasketing in HASL?⼀
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Answer: Uneven surfaces cause leakage of paste underneath the stenc il
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Quiz: What other surface finishes are better/flatter than HASL?⼀
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Answer: Gray tin, nickel/gold, nickel/palladium gold, immersion "w
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hite" tin, immersion silver, ENIG
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Quiz:
What surface finish is good for BGAs and surface mount ENIG
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?⼀ Answer:

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Quiz:
Why would you use a washable solder mask / what is the
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advantage?⼀
Answer: Washable masks are removable; they come off in a cleaning
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operation