Certified Fiber Optics Practice Exam

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How many times the outside diameter is recommended for the bend radius of cables when not subjected to tensile loading?

5 times
8 times
10 times
12 times

The correct answer is: 10 times

The recommended bend radius for fiber optic cables, when not subjected to tensile loading, is generally specified to be at least 10 times the outside diameter of the cable. This guideline ensures that the cable maintains its integrity and performance during installation and operation. A bend radius that is too small can lead to increased attenuation, potential microbending, and other detrimental effects on signal quality. Using a bend radius of 10 times the outside diameter allows sufficient space for the fiber within the cable to flex without causing stress or damage to the fibers. This precaution helps prevent the risk of breaking or degrading the fiber, which is crucial for maintaining signal strength and reliability. The other options suggest bend radii that are either less than 10 times the outside diameter (which could risk damage to the fibers) or more than that, which while safe, provides unnecessary constraints during installation. Therefore, adhering to the 10 times ratio provides a balanced approach to cable management and performance.