J-STD-001 2026 EXAM COMPLETE
QUESTIONS WITH CORRECT DETAILED
ANSWERS
J-STD-001 Exam Questions & Answers
Category 1: Standard Overview & Core Principles
1. What is the primary purpose of the J-STD-001 standard?
o A) To specify the best soldering iron to use.
o B) To describe materials, methods, and verification criteria for producing quality
soldered interconnections.
o C) To define the chemical composition of all fluxes.
o D) To set the price of PCB assemblies.
2. The acceptability requirements in J-STD-001 are divided into three classes. What are
they?
o A) Class A, Class B, Class C
o B) Level 1, Level 2, Level 3
o C) Class 1, Class 2, Class 3
o D) Grade 1, Grade 2, Grade 3
3. Which class of products, as defined by J-STD-001, has the most stringent criteria and is
intended for high-performance or life-critical electronic assemblies?
o A) Class 1
o B) Class 2
o C) Class 3
o D) Class A
4. What is the definition of a "Target" condition in J-STD-001?
, o A) A condition that is a process indicator and may not be optimal.
o B) A condition that is ideal, but not required for reliability.
o C) A condition that is a defect and must be reworked.
o D) A condition that is only acceptable for Class 1 products.
5. What is the definition of an "Acceptable" condition in J-STD-001?
o A) A condition that ensures the highest reliability.
o B) A condition that may not be perfect but maintains the integrity and reliability
of the assembly.
o C) A condition that is a defect but can be ignored.
o D) A condition that is only allowed for prototyping.
6. What is the definition of a "Defect" condition in J-STD-001?
o A) A condition that is not ideal but is still reliable.
o B) A condition that fails to meet the acceptance criteria and requires rework or
repair.
o C) A condition that is only a problem for Class 3 products.
o D) A condition that is a target for process improvement.
7. The term "Process Indicator" refers to:
o A) A perfect solder joint.
o B) A condition that is not a defect but indicates a potential process issue that may
need correction.
o C) A mandatory rework condition.
o D) A tool used for calibration.
8. Which document takes precedence if there is a conflict between the J-STD-001 and a
specific product drawing?
o A) J-STD-001 always takes precedence.
o B) The product drawing/contract takes precedence.
o C) The operator's judgment takes precedence.
, o D) The older document takes precedence.
Category 2: Materials (Solder, Flux, Components)
9. What is the typical composition of Sn63/Pb37 solder alloy?
o A) 60% Tin, 40% Lead
o B) 63% Tin, 37% Lead
o C) 37% Tin, 63% Lead
o D) 50% Tin, 50% Lead
10. What is the primary advantage of using a Sn63/Pb37 eutectic solder alloy?
o A) It is the cheapest option.
o B) It has a precise melting point and transitions directly from solid to liquid.
o C) It is the strongest alloy available.
o D) It contains no lead.
11. A common lead-free solder alloy is:
o A) Sn100 (100% Tin)
o B) Sn96.5/Ag3.0/Cu0.5 (SAC305)
o C) Pb90/Sn10
o D) Ag70/Cu30
12. The primary purpose of flux in the soldering process is to:
o A) Conduct electricity.
o B) Act as a glue to hold components in place.
o C) Remove oxides and prevent re-oxidation of the surfaces to be soldered.
o D) Lower the melting point of the solder.
13. Which flux type, per J-STD-001, leaves no corrosive residues and requires no cleaning?
o A) Rosin (RO)
o B) Rosin Mildly Activated (RMA)
o C) No-Clean (NC)
, o D) Water-Soluble (WS)
14. If a Water-Soluble (WS) flux is used, what subsequent process is mandatory?
o A) No action is needed.
o B) The assembly must be cleaned to remove ionic residues.
o C) The assembly must be baked.
o D) A conformal coating must be applied.
15. Solder wire used for manual soldering is often classified by its:
o A) Color and length.
o B) Core type and flux percentage.
o C) Electrical conductivity.
o D) Country of origin.
16. Component leads and terminations must be:
o A) Solderable as defined by the procurement documents.
o B) Always made of gold.
o C) Cleaned with abrasives immediately before soldering.
o D) Pre-tinned with a different alloy than the solder.
Category 3: Tools & Equipment
17. A controlled-temperature soldering iron is essential to:
o A) Make the operator work faster.
o B) Prevent thermal damage to the board and components and ensure consistent
results.
o C) Use the cheapest tip possible.
o D) Eliminate the need for flux.
18. The selection of a soldering iron tip size and shape is primarily based on:
o A) The color of the tip.
o B) The operator's preference.
QUESTIONS WITH CORRECT DETAILED
ANSWERS
J-STD-001 Exam Questions & Answers
Category 1: Standard Overview & Core Principles
1. What is the primary purpose of the J-STD-001 standard?
o A) To specify the best soldering iron to use.
o B) To describe materials, methods, and verification criteria for producing quality
soldered interconnections.
o C) To define the chemical composition of all fluxes.
o D) To set the price of PCB assemblies.
2. The acceptability requirements in J-STD-001 are divided into three classes. What are
they?
o A) Class A, Class B, Class C
o B) Level 1, Level 2, Level 3
o C) Class 1, Class 2, Class 3
o D) Grade 1, Grade 2, Grade 3
3. Which class of products, as defined by J-STD-001, has the most stringent criteria and is
intended for high-performance or life-critical electronic assemblies?
o A) Class 1
o B) Class 2
o C) Class 3
o D) Class A
4. What is the definition of a "Target" condition in J-STD-001?
, o A) A condition that is a process indicator and may not be optimal.
o B) A condition that is ideal, but not required for reliability.
o C) A condition that is a defect and must be reworked.
o D) A condition that is only acceptable for Class 1 products.
5. What is the definition of an "Acceptable" condition in J-STD-001?
o A) A condition that ensures the highest reliability.
o B) A condition that may not be perfect but maintains the integrity and reliability
of the assembly.
o C) A condition that is a defect but can be ignored.
o D) A condition that is only allowed for prototyping.
6. What is the definition of a "Defect" condition in J-STD-001?
o A) A condition that is not ideal but is still reliable.
o B) A condition that fails to meet the acceptance criteria and requires rework or
repair.
o C) A condition that is only a problem for Class 3 products.
o D) A condition that is a target for process improvement.
7. The term "Process Indicator" refers to:
o A) A perfect solder joint.
o B) A condition that is not a defect but indicates a potential process issue that may
need correction.
o C) A mandatory rework condition.
o D) A tool used for calibration.
8. Which document takes precedence if there is a conflict between the J-STD-001 and a
specific product drawing?
o A) J-STD-001 always takes precedence.
o B) The product drawing/contract takes precedence.
o C) The operator's judgment takes precedence.
, o D) The older document takes precedence.
Category 2: Materials (Solder, Flux, Components)
9. What is the typical composition of Sn63/Pb37 solder alloy?
o A) 60% Tin, 40% Lead
o B) 63% Tin, 37% Lead
o C) 37% Tin, 63% Lead
o D) 50% Tin, 50% Lead
10. What is the primary advantage of using a Sn63/Pb37 eutectic solder alloy?
o A) It is the cheapest option.
o B) It has a precise melting point and transitions directly from solid to liquid.
o C) It is the strongest alloy available.
o D) It contains no lead.
11. A common lead-free solder alloy is:
o A) Sn100 (100% Tin)
o B) Sn96.5/Ag3.0/Cu0.5 (SAC305)
o C) Pb90/Sn10
o D) Ag70/Cu30
12. The primary purpose of flux in the soldering process is to:
o A) Conduct electricity.
o B) Act as a glue to hold components in place.
o C) Remove oxides and prevent re-oxidation of the surfaces to be soldered.
o D) Lower the melting point of the solder.
13. Which flux type, per J-STD-001, leaves no corrosive residues and requires no cleaning?
o A) Rosin (RO)
o B) Rosin Mildly Activated (RMA)
o C) No-Clean (NC)
, o D) Water-Soluble (WS)
14. If a Water-Soluble (WS) flux is used, what subsequent process is mandatory?
o A) No action is needed.
o B) The assembly must be cleaned to remove ionic residues.
o C) The assembly must be baked.
o D) A conformal coating must be applied.
15. Solder wire used for manual soldering is often classified by its:
o A) Color and length.
o B) Core type and flux percentage.
o C) Electrical conductivity.
o D) Country of origin.
16. Component leads and terminations must be:
o A) Solderable as defined by the procurement documents.
o B) Always made of gold.
o C) Cleaned with abrasives immediately before soldering.
o D) Pre-tinned with a different alloy than the solder.
Category 3: Tools & Equipment
17. A controlled-temperature soldering iron is essential to:
o A) Make the operator work faster.
o B) Prevent thermal damage to the board and components and ensure consistent
results.
o C) Use the cheapest tip possible.
o D) Eliminate the need for flux.
18. The selection of a soldering iron tip size and shape is primarily based on:
o A) The color of the tip.
o B) The operator's preference.
