CID Quality Control & Process Improvement 2

Question 1

Which IPC standard defines acceptability requirements for printed boards after fabrication?

Accepted Answer

IPC-A-600

Answer

IPC-A-600 establishes acceptability requirements for the visual inspection of printed boards post-fabrication.

Question 2

In Statistical Process Control (SPC), a Cpk value greater than 1.33 indicates:

Accepted Answer

The process is capable and centered

Answer

A Cpk ≥ 1.33 is the industry benchmark indicating the process is both capable and sufficiently centered within its specification limits.

Question 3

What does a Fishbone (Ishikawa) diagram primarily help identify during PCB quality investigations?

Accepted Answer

Root causes of a defect by category

Answer

The Ishikawa diagram organizes potential root causes into categories (machines, methods, materials, etc.) to systematically identify defect sources.

Question 4

Which failure analysis technique applies voltage stress to accelerate latent defects in interconnect structures?

Accepted Answer

HAST testing

Answer

HAST (Highly Accelerated Stress Test) uses elevated temperature, humidity, and voltage bias to accelerate corrosion and electrochemical migration failures.

Question 5

During incoming inspection of PCB laminates, which property is most critical to verify for impedance-controlled designs?

Accepted Answer

Dielectric constant (Dk)

Answer

Dielectric constant directly determines trace impedance; variation in Dk causes impedance deviations that cannot be corrected after fabrication.

(CID) Certified Interconnect Designer Practice Test

(CID) Certified Interconnect Designer Practice Test

CID Quality Control & Process Improvement 2