IPC CID+ CERTIFICATION EXAM:
PCB MATERIALS, FINISHES, AND
MANUFACTURING PROCESSES
LATEST MOCK PRACTICE SET
200 Questions with Answers and Detailed Rationales
100 PERCENT GUARANTEED PASS
INSTANT DOWNLOAD ANSWERS INCLUDED
IMPORTANCE OF THIS DOCUMENT
This comprehensive examination preparation guide has been meticulously developed to help you succeed in the
IPC CID+ CERTIFICATION EXAM: PCB MATERIALS, FINISHES, AND MANUFACTURING PROCESSES. It
contains 200 carefully selected questions that reflect the most current exam content and testing strategies. Each
question is accompanied by a correct answer and a detailed rationale that explains the underlying
pathophysiology, pharmacology, or clinical reasoning.
Self-Assessment – Test your knowledge and Exam Preparation – Familiarize yourself with the
identify areas requiring further question format and content
study areas
Concept Reinforcement – Deepen your Confidence Building – Develop test-taking
understanding through strategies and reduce
evidence-based exam anxiety
rationales
Time Management – Practice answering
questions under simulated
exam conditions
Review Summary 200 Questions
Foundations - Application - IPC CID Certification PCB Materials Finishes AND Manufacturing Processes
Printed Circuit Board Design AND Manufacturing Graduate / Professional Certification
All answers with rationales
,Table of Contents
Section A - PCB BASE Materials AND Section B - Copper Foils AND Surface
Laminates Finishes
Questions 1 to 50 Questions 51 to 100
Section C - Solder MASK AND Legend Section D - PCB Manufacturing
INKS Processes Imaging Etching AND
Questions 101 to 150 Plating
Questions 151 to 200
,Section A - PCB BASE Materials AND Laminates
Q1.
A designer specifies a 16-layer PCB with a total thickness of 1.6 mm using FR-4 (r = 4.2 at
1 GHz). For a 50 microstrip line on the top layer with a trace width of 0.3 mm, what is the
approximate required prepreg thickness (in mm) assuming a copper thickness of 0.035
mm and a solder mask thickness of 0.02 mm?
A. 0.10 B. 0.15
C. 0.20 D. 0.25
Correct: B - 0.15
Rationale:Using the microstrip impedance formula: Z0 "H 87/"(µr+1.41) * ln(5.98h/(0.8w+t)).
Substituting Z0=50, r=4.2, w=0.3, t=0.035, and solving for h yields approximately 0.15 mm.
Option A (0.10 mm) gives too low impedance, C and D are too high.
Q2.
During HASL (Hot Air Solder Leveling) of an ENIG-finished board, a large BGA pad
exhibits non-wetting. Which root cause is most consistent with this defect?
A. Excessive immersion gold thickness B. Contamination from the HASL flux
(>0.15 µm) on the ENIG surface residue
C. Inadequate copper etch-back prior to D. Thermal shock causing delamination of
ENIG deposition the solder mask
Correct: A - Excessive immersion gold thickness (>0.15 µm) on the ENIG surface
Rationale:Excessive gold thickness (>0.15 µm) in ENIG can lead to gold embrittlement and
non-wetting during subsequent HASL because the gold dissolves into the solder, forming
brittle intermetallics and depleting the solder of tin. Option B is less likely because flux is
designed to promote wetting. Option C is unrelated to ENIG. Option D would cause other
defects like blistering, not isolated non-wetting.
Q3.
A high-reliability PCB uses a hybrid stack-up with both standard FR-4 and a low-loss
PTFE/woven glass composite. During lamination, the PTFE layer exhibits excessive resin
starvation. Which parameter adjustment is most effective to mitigate this?
A. Increase the lamination pressure by 50% B. Decrease the heating rate to 2°C/min
C. Add a thin layer of adhesive film between D. Reduce the cooling rate after cure
the FR-4 and PTFE
Page 3
, Section A - PCB BASE Materials AND Laminates
Correct: C - Add a thin layer of adhesive film between the FR-4 and PTFE
Rationale:PTFE has low surface energy and poor adhesion to FR-4; resin starvation occurs
because the PTFE does not bond well. Adding an adhesive film (e.g., bond ply) improves
adhesion and prevents resin migration. Increasing pressure (A) may cause excessive resin
flow. Decreasing heating rate (B) may help but is secondary. Reducing cooling rate (D) does
not address the root cause.
Q4.
A PCB fabricated with immersion silver finish shows dendritic growth between fine-pitch
QFP pads after exposure to a humid environment. Which corrective action is most
appropriate to prevent recurrence?
A. Switch to immersion tin finish with a B. Apply a conformal coating with high
thinner deposit moisture vapor transmission rate
C. Increase the silver thickness to >0.5 µm D. Implement a post-immersion anti-tarnish
rinse with an organic inhibitor
Correct: D - Implement a post-immersion anti-tarnish rinse with an organic inhibitor
Rationale:Immersion silver is susceptible to silver migration (dendritic growth) under bias and
humidity. An anti-tarnish rinse containing an organic inhibitor (e.g., benzotriazole) forms a
protective layer that reduces migration. Switching to immersion tin (A) is not a correction; tin
also migrates. Conformal coating with high MVTR (B) would not block moisture. Increasing
silver thickness (C) worsens migration.
Q5.
A 0.5 mm pitch BGA is to be assembled on a board with OSP (Organic Solderability
Preservative) finish. The OSP coating is 0.3 µm thick and consists of a benzimidazole
compound. During reflow, the OSP fails to volatilize completely, causing solder ball
non-wetting. What is the most likely cause?
A. OSP thickness exceeds the B. Peak reflow temperature is too high,
recommended maximum of 0.2 µm causing OSP polymerization
C. Nitrogen atmosphere during reflow D. The OSP was applied over a
inhibits OSP decomposition contaminated copper surface
Correct: A - OSP thickness exceeds the recommended maximum of 0.2 µm
Rationale:OSP thickness above 0.2 µm leads to incomplete volatilization during reflow,
leaving residues that impede wetting. Option B is incorrect because high temperature typically
aids decomposition. Nitrogen atmosphere (C) generally improves wetting and does not inhibit
OSP breakdown. Contamination (D) would cause other defects but not specifically OSP
failure to volatilize.
Page 4
PCB MATERIALS, FINISHES, AND
MANUFACTURING PROCESSES
LATEST MOCK PRACTICE SET
200 Questions with Answers and Detailed Rationales
100 PERCENT GUARANTEED PASS
INSTANT DOWNLOAD ANSWERS INCLUDED
IMPORTANCE OF THIS DOCUMENT
This comprehensive examination preparation guide has been meticulously developed to help you succeed in the
IPC CID+ CERTIFICATION EXAM: PCB MATERIALS, FINISHES, AND MANUFACTURING PROCESSES. It
contains 200 carefully selected questions that reflect the most current exam content and testing strategies. Each
question is accompanied by a correct answer and a detailed rationale that explains the underlying
pathophysiology, pharmacology, or clinical reasoning.
Self-Assessment – Test your knowledge and Exam Preparation – Familiarize yourself with the
identify areas requiring further question format and content
study areas
Concept Reinforcement – Deepen your Confidence Building – Develop test-taking
understanding through strategies and reduce
evidence-based exam anxiety
rationales
Time Management – Practice answering
questions under simulated
exam conditions
Review Summary 200 Questions
Foundations - Application - IPC CID Certification PCB Materials Finishes AND Manufacturing Processes
Printed Circuit Board Design AND Manufacturing Graduate / Professional Certification
All answers with rationales
,Table of Contents
Section A - PCB BASE Materials AND Section B - Copper Foils AND Surface
Laminates Finishes
Questions 1 to 50 Questions 51 to 100
Section C - Solder MASK AND Legend Section D - PCB Manufacturing
INKS Processes Imaging Etching AND
Questions 101 to 150 Plating
Questions 151 to 200
,Section A - PCB BASE Materials AND Laminates
Q1.
A designer specifies a 16-layer PCB with a total thickness of 1.6 mm using FR-4 (r = 4.2 at
1 GHz). For a 50 microstrip line on the top layer with a trace width of 0.3 mm, what is the
approximate required prepreg thickness (in mm) assuming a copper thickness of 0.035
mm and a solder mask thickness of 0.02 mm?
A. 0.10 B. 0.15
C. 0.20 D. 0.25
Correct: B - 0.15
Rationale:Using the microstrip impedance formula: Z0 "H 87/"(µr+1.41) * ln(5.98h/(0.8w+t)).
Substituting Z0=50, r=4.2, w=0.3, t=0.035, and solving for h yields approximately 0.15 mm.
Option A (0.10 mm) gives too low impedance, C and D are too high.
Q2.
During HASL (Hot Air Solder Leveling) of an ENIG-finished board, a large BGA pad
exhibits non-wetting. Which root cause is most consistent with this defect?
A. Excessive immersion gold thickness B. Contamination from the HASL flux
(>0.15 µm) on the ENIG surface residue
C. Inadequate copper etch-back prior to D. Thermal shock causing delamination of
ENIG deposition the solder mask
Correct: A - Excessive immersion gold thickness (>0.15 µm) on the ENIG surface
Rationale:Excessive gold thickness (>0.15 µm) in ENIG can lead to gold embrittlement and
non-wetting during subsequent HASL because the gold dissolves into the solder, forming
brittle intermetallics and depleting the solder of tin. Option B is less likely because flux is
designed to promote wetting. Option C is unrelated to ENIG. Option D would cause other
defects like blistering, not isolated non-wetting.
Q3.
A high-reliability PCB uses a hybrid stack-up with both standard FR-4 and a low-loss
PTFE/woven glass composite. During lamination, the PTFE layer exhibits excessive resin
starvation. Which parameter adjustment is most effective to mitigate this?
A. Increase the lamination pressure by 50% B. Decrease the heating rate to 2°C/min
C. Add a thin layer of adhesive film between D. Reduce the cooling rate after cure
the FR-4 and PTFE
Page 3
, Section A - PCB BASE Materials AND Laminates
Correct: C - Add a thin layer of adhesive film between the FR-4 and PTFE
Rationale:PTFE has low surface energy and poor adhesion to FR-4; resin starvation occurs
because the PTFE does not bond well. Adding an adhesive film (e.g., bond ply) improves
adhesion and prevents resin migration. Increasing pressure (A) may cause excessive resin
flow. Decreasing heating rate (B) may help but is secondary. Reducing cooling rate (D) does
not address the root cause.
Q4.
A PCB fabricated with immersion silver finish shows dendritic growth between fine-pitch
QFP pads after exposure to a humid environment. Which corrective action is most
appropriate to prevent recurrence?
A. Switch to immersion tin finish with a B. Apply a conformal coating with high
thinner deposit moisture vapor transmission rate
C. Increase the silver thickness to >0.5 µm D. Implement a post-immersion anti-tarnish
rinse with an organic inhibitor
Correct: D - Implement a post-immersion anti-tarnish rinse with an organic inhibitor
Rationale:Immersion silver is susceptible to silver migration (dendritic growth) under bias and
humidity. An anti-tarnish rinse containing an organic inhibitor (e.g., benzotriazole) forms a
protective layer that reduces migration. Switching to immersion tin (A) is not a correction; tin
also migrates. Conformal coating with high MVTR (B) would not block moisture. Increasing
silver thickness (C) worsens migration.
Q5.
A 0.5 mm pitch BGA is to be assembled on a board with OSP (Organic Solderability
Preservative) finish. The OSP coating is 0.3 µm thick and consists of a benzimidazole
compound. During reflow, the OSP fails to volatilize completely, causing solder ball
non-wetting. What is the most likely cause?
A. OSP thickness exceeds the B. Peak reflow temperature is too high,
recommended maximum of 0.2 µm causing OSP polymerization
C. Nitrogen atmosphere during reflow D. The OSP was applied over a
inhibits OSP decomposition contaminated copper surface
Correct: A - OSP thickness exceeds the recommended maximum of 0.2 µm
Rationale:OSP thickness above 0.2 µm leads to incomplete volatilization during reflow,
leaving residues that impede wetting. Option B is incorrect because high temperature typically
aids decomposition. Nitrogen atmosphere (C) generally improves wetting and does not inhibit
OSP breakdown. Contamination (D) would cause other defects but not specifically OSP
failure to volatilize.
Page 4
