CPCT CPCT Fiber Optic Cabling & Termination 1

Question 1

Which fiber optic connector type uses a push-pull latching mechanism and is commonly used in high-density patch panels?

Accepted Answer

LC connector

Answer

The LC (Lucent Connector) uses a push-pull latch and its small form factor makes it ideal for high-density applications.

Question 2

What is the primary difference between single-mode and multimode fiber optic cable?

Accepted Answer

Single-mode has a smaller core diameter and carries one light path, while multimode has a larger core carrying multiple light paths

Answer

Single-mode fiber has a ~9µm core allowing one light mode, enabling long distances, while multimode has a 50 or 62.5µm core supporting multiple modes over shorter runs.

Question 3

What does OTDR stand for in fiber optic testing?

Accepted Answer

Optical Time Domain Reflectometer

Answer

An OTDR (Optical Time Domain Reflectometer) sends pulses of light into fiber and measures backscatter and reflections to locate faults and measure loss.

Question 4

What is the maximum bend radius typically recommended for fiber optic cable during installation?

Accepted Answer

20 times the cable diameter

Answer

During installation, fiber optic cable should not be bent to a radius less than 20 times the cable diameter to prevent microbending losses and physical damage.

Question 5

Which fiber optic polishing style produces the lowest back reflection and is preferred for high-speed digital links?

Accepted Answer

APC (Angled Physical Contact)

Answer

APC connectors are polished at an 8-degree angle, directing reflected light away from the fiber core, achieving back reflection of -65 dB or better.

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(CPCT) Certified Premises Cabling Technician Practice Test

CPCT CPCT Fiber Optic Cabling & Termination 1