IPC / J-STD-001 Electronic Assembly & Soldering
Workmanship Comprehensive 200-Question Study and
Examination Guide
1. What is J-STD-003?
A) Solder alloy composition requirements
B) Solder paste handling procedures
C) Solderability tests for printed boards
D) Flux classification standard
Answer: C
J-STD-003 focuses on solderability testing for printed boards. It verifies that PCB surface
finishes can properly accept solder. Poor solderability can lead to weak joints and
assembly defects.
2. What is J-STD-004?
A) Solder alloy requirements
B) Requirements for soldering fluxes
C) PCB design rules
D) Conformal coating criteria
Answer: B
J-STD-004 defines flux classifications, activity levels, and requirements. Proper flux
selection ensures effective oxide removal and good wetting. Using compliant flux
prevents corrosion and residue-related failures.
3. What is J-STD-005?
A) Solder wire requirements
B) Flux removal criteria
C) Solder paste requirements
D) PCB acceptance criteria
Answer: C
J-STD-005 specifies solder paste composition, performance, and testing. Correct solder
paste ensures consistent reflow and reliable solder joints. Improper paste selection can
cause voids, bridging, or insufficient wetting.
4. What is J-STD-006?
A) Flux activity levels
B) Electronic-grade solder alloy requirements
C) PCB laminate specifications
D) Conformal coating requirements
Answer: B
J-STD-006 governs solder alloy composition and purity. It ensures predictable melting
behavior and metallurgical compatibility. This standard applies to both fluxed and non-
fluxed solders.
,5. Manufacturers shall have a Pb-free control plan for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Lead-free soldering introduces higher temperatures and different material behaviors. A
control plan prevents cross-contamination with SnPb materials. All product classes must
comply with Pb-free controls.
6. Items exposed to uncured silicone material shall not be used for processing other material
for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Uncured silicone can transfer contaminants to tools and hardware. This contamination
interferes with soldering and adhesion processes. Segregation is required for all classes to
maintain reliability.
7. Solder alloys shall be in accordance with J-STD-006 or equivalent for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Qualified solder alloys ensure consistent melting and wetting behavior. Unapproved
alloys can cause unpredictable joint performance. Compliance is mandatory for all
product classes.
8. Solder paste shall be in accordance with J-STD-005 or equivalent for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Approved solder paste ensures stable printing and reflow performance. Variations in
paste chemistry can result in defects. All classes require standardized solder paste.
9. Pb-free processing shall be in accordance with a documented procedure for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Pb-free soldering requires tighter thermal and material control. Documented procedures
ensure consistency and repeatability. This requirement applies to all product classes.
10. Dross shall be removed from the solder surface without contacting tinned or soldered
items for:
, A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Dross contains oxides that contaminate solder joints. Contact with assemblies can
introduce defects. Controlled removal is required for all classes.
11. Type H or M fluxes shall not be used for tinning stranded wires for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
High-activity fluxes are corrosive and difficult to remove. Residues can cause long-term
reliability issues. These fluxes are prohibited for all classes.
12. Flux shall be in accordance with J-STD-004 or equivalent for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Using qualified flux ensures predictable soldering behavior. Improper flux selection can
lead to corrosion or poor wetting. All assemblies must meet this requirement.
13. Adhesives shall not be detrimental and shall be cured for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Uncured or incompatible adhesives can cause contamination or mechanical failure.
Proper curing ensures long-term stability. This applies to all product classes.
14. Component coating meniscus shall not be trimmed for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Trimming the coating meniscus can expose conductive surfaces. This increases the risk
of contamination and corrosion. Therefore, trimming is prohibited for all classes.
15. A tool used to cut leads shall not impart shock that damages the component or solder
joint for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
, Mechanical shock can crack solder joints or damage components. Controlled cutting
prevents hidden defects. This requirement applies to all classes.
16. Solder wicking shall not extend into areas required to remain flexible for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Excessive solder wicking stiffens conductors. This increases stress during movement or
vibration. Flexibility must be preserved for all classes.
17. Residue of chemical insulation stripping products should be removed within what time
after completion?
A) 30 minutes
B) 1 hour
C) 3 hours
D) 24 hours
Answer: C
Chemical stripping residues are corrosive. Prompt removal prevents conductor damage
and insulation degradation. The standard specifies removal within three hours.
18. Rework processes shall be included in the process qualification for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Rework can affect reliability just as much as original assembly. Qualified processes
ensure consistent results. All classes require rework qualification.
19. Components shall not be charred or exhibit excessive damage for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Charring indicates excessive heat exposure. Thermal damage degrades component
performance and reliability. This condition is unacceptable for all classes.
20. Proper solder wetting is indicated by:
A) Beading of solder
B) Rough or grainy appearance
C) Smooth and continuous solder flow
D) Sharp solder peaks
Answer: C
Good wetting shows a metallurgical bond between solder and surfaces. Smooth flow
indicates oxide removal and proper temperature. Poor wetting leads to weak joints.
21. Cold solder joints are unacceptable because they:
A) Improve flexibility
B) Increase conductivity
Workmanship Comprehensive 200-Question Study and
Examination Guide
1. What is J-STD-003?
A) Solder alloy composition requirements
B) Solder paste handling procedures
C) Solderability tests for printed boards
D) Flux classification standard
Answer: C
J-STD-003 focuses on solderability testing for printed boards. It verifies that PCB surface
finishes can properly accept solder. Poor solderability can lead to weak joints and
assembly defects.
2. What is J-STD-004?
A) Solder alloy requirements
B) Requirements for soldering fluxes
C) PCB design rules
D) Conformal coating criteria
Answer: B
J-STD-004 defines flux classifications, activity levels, and requirements. Proper flux
selection ensures effective oxide removal and good wetting. Using compliant flux
prevents corrosion and residue-related failures.
3. What is J-STD-005?
A) Solder wire requirements
B) Flux removal criteria
C) Solder paste requirements
D) PCB acceptance criteria
Answer: C
J-STD-005 specifies solder paste composition, performance, and testing. Correct solder
paste ensures consistent reflow and reliable solder joints. Improper paste selection can
cause voids, bridging, or insufficient wetting.
4. What is J-STD-006?
A) Flux activity levels
B) Electronic-grade solder alloy requirements
C) PCB laminate specifications
D) Conformal coating requirements
Answer: B
J-STD-006 governs solder alloy composition and purity. It ensures predictable melting
behavior and metallurgical compatibility. This standard applies to both fluxed and non-
fluxed solders.
,5. Manufacturers shall have a Pb-free control plan for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Lead-free soldering introduces higher temperatures and different material behaviors. A
control plan prevents cross-contamination with SnPb materials. All product classes must
comply with Pb-free controls.
6. Items exposed to uncured silicone material shall not be used for processing other material
for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Uncured silicone can transfer contaminants to tools and hardware. This contamination
interferes with soldering and adhesion processes. Segregation is required for all classes to
maintain reliability.
7. Solder alloys shall be in accordance with J-STD-006 or equivalent for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Qualified solder alloys ensure consistent melting and wetting behavior. Unapproved
alloys can cause unpredictable joint performance. Compliance is mandatory for all
product classes.
8. Solder paste shall be in accordance with J-STD-005 or equivalent for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Approved solder paste ensures stable printing and reflow performance. Variations in
paste chemistry can result in defects. All classes require standardized solder paste.
9. Pb-free processing shall be in accordance with a documented procedure for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Pb-free soldering requires tighter thermal and material control. Documented procedures
ensure consistency and repeatability. This requirement applies to all product classes.
10. Dross shall be removed from the solder surface without contacting tinned or soldered
items for:
, A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Dross contains oxides that contaminate solder joints. Contact with assemblies can
introduce defects. Controlled removal is required for all classes.
11. Type H or M fluxes shall not be used for tinning stranded wires for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
High-activity fluxes are corrosive and difficult to remove. Residues can cause long-term
reliability issues. These fluxes are prohibited for all classes.
12. Flux shall be in accordance with J-STD-004 or equivalent for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Using qualified flux ensures predictable soldering behavior. Improper flux selection can
lead to corrosion or poor wetting. All assemblies must meet this requirement.
13. Adhesives shall not be detrimental and shall be cured for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Uncured or incompatible adhesives can cause contamination or mechanical failure.
Proper curing ensures long-term stability. This applies to all product classes.
14. Component coating meniscus shall not be trimmed for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Trimming the coating meniscus can expose conductive surfaces. This increases the risk
of contamination and corrosion. Therefore, trimming is prohibited for all classes.
15. A tool used to cut leads shall not impart shock that damages the component or solder
joint for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
, Mechanical shock can crack solder joints or damage components. Controlled cutting
prevents hidden defects. This requirement applies to all classes.
16. Solder wicking shall not extend into areas required to remain flexible for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Excessive solder wicking stiffens conductors. This increases stress during movement or
vibration. Flexibility must be preserved for all classes.
17. Residue of chemical insulation stripping products should be removed within what time
after completion?
A) 30 minutes
B) 1 hour
C) 3 hours
D) 24 hours
Answer: C
Chemical stripping residues are corrosive. Prompt removal prevents conductor damage
and insulation degradation. The standard specifies removal within three hours.
18. Rework processes shall be included in the process qualification for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Rework can affect reliability just as much as original assembly. Qualified processes
ensure consistent results. All classes require rework qualification.
19. Components shall not be charred or exhibit excessive damage for:
A) Class 1
B) Class 2
C) Class 3
D) Class 1, Class 2, and Class 3
Answer: D
Charring indicates excessive heat exposure. Thermal damage degrades component
performance and reliability. This condition is unacceptable for all classes.
20. Proper solder wetting is indicated by:
A) Beading of solder
B) Rough or grainy appearance
C) Smooth and continuous solder flow
D) Sharp solder peaks
Answer: C
Good wetting shows a metallurgical bond between solder and surfaces. Smooth flow
indicates oxide removal and proper temperature. Poor wetting leads to weak joints.
21. Cold solder joints are unacceptable because they:
A) Improve flexibility
B) Increase conductivity
