CID Research Methods & Evidence-Based Practice 2

Question 1

When researching minimum conductor spacing for a 150V PCB application, which IPC document is the primary design reference?

Accepted Answer

IPC-2221 (Generic Standard on Printed Board Design)

Answer

IPC-2221 Table 6-1 provides voltage-dependent minimum conductor spacing requirements for various environmental conditions.

Question 2

A CID finds two applicable IPC standards with conflicting requirements for the same parameter. What is the correct evidence-based approach?

Accepted Answer

Consult the scope sections of both documents to determine which takes precedence for the specific application

Answer

Each IPC standard defines its own scope; reviewing the scope sections identifies which document has authority for the specific application or product class.

Question 3

Which IPC document series provides standardized test methods for evaluating PCB materials, laminate properties, and process verification?

Accepted Answer

IPC-TM-650

Answer

IPC-TM-650 is the Test Methods Manual containing standardized procedures for measuring PCB and material properties.

Question 4

IPC Class 3 requirements differ from Class 2 primarily because Class 3 specifies:

Accepted Answer

Tighter tolerances and higher reliability for electronics where continued performance is critical

Answer

IPC Class 3 targets high-reliability products—such as medical and aerospace electronics—where performance failure cannot be tolerated.

Question 5

When evaluating published research on a new PCB surface finish, which source provides the highest quality evidence?

Accepted Answer

A peer-reviewed reliability study with controlled experiments and statistical analysis

Answer

Peer-reviewed controlled studies with statistical analysis represent the strongest evidence tier because they are independently validated and reproducible.

(CID) Certified Interconnect Designer Practice Test

(CID) Certified Interconnect Designer Practice Test

CID Research Methods & Evidence-Based Practice 2