CFOT Fiber Optic Cleaning and Inspection 2

Question 1

How many inspection zones are defined for single-mode connector end-faces per IEC 61300-3-35?

Accepted Answer

4

Answer

2

Answer

3

Answer

5

Question 2

What purity level of isopropyl alcohol (IPA) is recommended for cleaning fiber optic connectors?

Accepted Answer

99%

Answer

70%

Answer

91%

Answer

50%

Question 3

Which cleaning tool is designed specifically to clean the ferrule end-face of a connector installed inside an adapter?

Accepted Answer

Stick cleaner (push-to-clean device)

Answer

Reel-type cassette cleaner

Answer

Lint-free wipe pad

Answer

Pressurized air canister

Question 4

What contaminant transferred by direct hand contact with fiber end-faces is particularly problematic because it leaves a persistent film?

Accepted Answer

Skin oils

Answer

Metallic dust from cutting tools

Answer

Moisture condensation

Answer

Cladding buffer material

Question 5

Per IEC 61300-3-35, what is the allowable number of scratches in Zone A (core region) for a single-mode PC connector to pass inspection?

Accepted Answer

No scratches are allowed in Zone A

Answer

Up to 3 scratches ≤3 μm wide

Answer

Up to 1 scratch ≤5 μm wide

Answer

Up to 5 scratches of any size

Question 6

How should fiber optic connectors be stored when they are not mated or in use?

Accepted Answer

Cap them with protective dust caps

Answer

Leave them exposed to monitor for environmental damage

Answer

Wrap them in standard paper towels

Answer

Submerge them in an IPA solution

Question 7

What can occur when two contaminated fiber end-faces are mated under the spring pressure of a connector?

Accepted Answer

Hard particles can be embedded into the glass causing permanent damage

Answer

Contamination is destroyed by the compression force

Answer

Signal loss temporarily increases then self-corrects over time

Answer

Contamination migrates only to the outer contact zone