CIS CIS PCB Design & Fabrication Standards

Question 1

According to IPC-2221, what is the minimum electrical clearance required between conductors at 101–170V AC in an uncoated internal layer?

Accepted Answer

0.2 mm

Answer

IPC-2221 specifies 0.2 mm minimum clearance for uncoated internal conductors operating at 101–170V AC.

Question 2

Which IPC standard specifically covers the design of rigid printed boards?

Accepted Answer

IPC-2221

Answer

IPC-2221 is the generic standard for the design of organic printed boards and assemblies.

Question 3

What does the term 'annular ring' refer to on a printed circuit board?

Accepted Answer

The copper remaining on a pad after drilling

Answer

The annular ring is the portion of conductive material (copper) that remains on a pad after a hole has been drilled through it.

Question 4

IPC-6012 establishes qualification and performance requirements for which type of boards?

Accepted Answer

Rigid printed boards

Answer

IPC-6012 covers qualification and performance specification for rigid printed boards.

Question 5

What is 'controlled impedance' in PCB design?

Accepted Answer

Designing traces to a specific characteristic impedance value

Answer

Controlled impedance means designing PCB traces to achieve a specific characteristic impedance (e.g., 50Ω) to ensure signal integrity.

(CIS) Certified IPC Specialist Practice Test