CIT Acceptability of Electronic Assemblies 4

Question 1

According to IPC-A-610, conformal coating that has lifted from the board surface (delamination) on a Class 3 assembly is classified as:

Accepted Answer

A defect

Answer

Conformal coating delamination is a defect for Class 3 because it compromises environmental protection.

Question 2

What IPC-A-610 condition describes the presence of white residue under conformal coating that does not affect circuit performance?

Accepted Answer

Acceptable condition

Answer

White residue under conformal coating that does not affect performance is an acceptable condition per IPC-A-610.

Question 3

A PCB with measling (internal glass fiber separation visible as white spots) that does not reduce the electrical spacing below minimums is classified as:

Accepted Answer

Acceptable for all classes provided spacing is maintained

Answer

Measling is acceptable when it does not reduce conductor spacing below minimum electrical clearance requirements.

Question 4

Per IPC-A-610, a scratch on the PCB surface that does NOT expose base laminate is classified as:

Accepted Answer

Acceptable for all classes

Answer

Scratches that do not expose base laminate are acceptable for all classes per IPC-A-610.

Question 5

Which condition describes a hole in the solder joint that penetrates from one surface to another?

Accepted Answer

Pinhole/blowhole

Answer

A pinhole or blowhole is a void in the solder that penetrates through the solder mass from one surface to the other.

(CIT) Certified IPC Trainer Practice Test

(CIT) Certified IPC Trainer Practice Test

CIT Acceptability of Electronic Assemblies 4