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

1 Exampromax - Stuvia US2025/2026 dw dw dw dw




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


Quiz: The board material has significant influence on the electrical performan
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ce of the circuit from what two effects?⼀
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Answer: dielectric constant and the loss tangent
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Quiz: What are the 4 types of build-up multilayers?⼀
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Answer: Piercing post, Sequentially built-
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up multilayer, Passive substrate, Filled via sequential co-
Exampromax - Stuvia US




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laminated substrate dw




Quiz: The temperature at which anamorphous polymer changes from b
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eing 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 char dw dw dw dw dw dw dw




acteristic in the material which can cause potential difficulties in asse
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mbly⼀Answer: Moisture absorption d w dw




Quiz: What are the 3 general methods of plating material on PCBs?
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Answer: Immersion, electroless, and electrolytic
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Quiz: What are the benefits of metallic coatings / final(surface) finish?⼀
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Answer: Corrosion prevention, Improved long-term solderability
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Quiz:

,2 Exampromax - Stuvia US2025/2026 dw dw dw dw




Simplest of the wet processes; involves a simple galvanic re
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placement reaction; the more noble metal in the solution picks up
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, 3 Exampromax - Stuvia US2025/2026 dw dw dw dw




electrons from the less noble metal immersed in the solution and plates out
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⼀Answer: Immersion Plating d w dw




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 simple replac
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ement reaction dw




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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What are the assembly challenges/problems with HASL process?
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⼀
Exampromax -StuviaUS




Answer: Coplanarity / solder thickness varies, solder crowning, less uniformit
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Quiz:
Stencil fits flat on pad, opening is smaller than the land pattern in al
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l 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 stencil
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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 "white"
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tin, immersion silver, ENIG
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Quiz: What surface finish is good for BGAs and surface mount?⼀
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Answer: ENIG
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Quiz:
Why would you use a washable solder mask / what is the advant
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, 4 Exampromax - Stuvia US2025/2026
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age?⼀
Answer: Washable masks are removable; they come off in a cleaning opera
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tion