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

0.1 mm

Answer

0.5 mm

Answer

1.0 mm

Question 2

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

Accepted Answer

IPC-2221

Answer

IPC-A-610

Answer

IPC-7711

Answer

IPC-6012

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 solder mask opening around a pad

Answer

The plating thickness inside a via

Answer

The clearance between a via and a ground plane

Question 4

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

Accepted Answer

Rigid printed boards

Answer

Flexible printed boards

Answer

Rigid-flex printed boards

Answer

Metal core printed boards

Question 5

What is 'controlled impedance' in PCB design?

Accepted Answer

Designing traces to a specific characteristic impedance value

Answer

Maintaining consistent trace resistance across temperature

Answer

Limiting current density on high-power traces

Answer

Controlling the dielectric constant of the solder mask

Question 6

According to IPC-2221, which laminate property most directly affects the dielectric constant of a PCB?

Accepted Answer

Resin content (Dk)

Answer

Copper weight

Answer

Glass transition temperature (Tg)

Answer

Peel strength