Deck 10: Fiber-Optic Cable and National Electrical Code Article 770

Question 1

On manufacturer specification sheets, 62.5/125 refers to _________.

A) The diameter of the core and maximum speed of transmission
B) The diameter of the core and the critical angle
C) The diameter of the core and the diameter of the core and cladding
D) The diameter of the core and the maximum temperature rating in degrees Celsius

Answer 1

C

Question 2

Loose-tube cable is more commonly used inside a building.

Answer 2

False

Question 3

Glass fiber optic cables are flexible and can be bent around multiple sharp corners.

Answer 3

False

Question 4

On specification data sheet for optical fiber, this critical angle is known as ____________.

A) The index of reflection
B) The core index
C) The index of refraction
D) The numeric aperture

Question 5

Splicing fiber-optic cable either mechanically or by fusing two ends together will cause an average _______ loss of signal.

A) 0.12dB
B) 0.2dB
C) 1dB
D) 2dB

Question 6

Plastic optical fibers are a preferred choice in extreme temperatures.

Question 7

Graded index multimode fiber _________.

A) Causes light to travel faster along the outer edges of the cable and slower through the core
B) Transmits narrower bandwidths than step index
C) Causes light to travel slower along the outer edges of the cable and faster through the core
D) Will increase the travel time of light transmitting at higher modes

Question 8

The metallic components of conductive optical fiber cable _________.

A) Does not require grounding since there is no current flow
B) Must be grounded
C) Must be separated from Class 2 and Class 3 circuits
D) Are used to carry current for optional circuits

Question 9

Conductive optical fiber cables _________ occupy the same raceway or cable tray with those of Class 1 circuits.

A) Shall be permitted to
B) Shall not be permitted to
C) Should always
D) Used for communication circuits

Question 10

Light travels in the form of an electromagnetic wave.

Question 11

Which of the following statements is not true about single-mode fiber?

A) Is more subject to interference
B) Allows for greater transmission speeds
C) Requires a narrow width light source
D) Transmission distance can be fifty times longer than multimode fiber

Question 12

There is a difference between the index of refraction between the core and cladding of an optical fiber cable.

Question 13

Nonconductive optical fiber cables can be run in the same raceway or cable tray as Class 1 circuits.

Question 14

The transmission of light through fiber-optic cables is faster than copper conduction.

Question 15

Optical fiber cable will not protect circuits from electromagnetic interference (EMI).

Question 16

When fiber optic cables are manufactured, there can be slight flaws in the glass causing signal loss.

Question 17

What is the advantage of plastic optical fiber cable over glass optical fiber cable?

A) Can be used across a broad spectrum of light
B) Smaller in diameter
C) More resistant to high temperature environments
D) Lower cost

Question 18

Plastic optical fiber can effectively transmit across the entire spectrum of visible and infrared wavelengths.

Question 19

What is the purpose of a duplex connector?

A) To accommodate step index and grade index fiber
B) To mix multimode and single-mode fiber
C) To more easily accommodate the connection of a transmit and receive signal
D) To accommodate both glass and plastic optical fiber cable

Question 20

A type of cable that can transmit a viewable image from one end to the other _________.

A) Randomized bundle
B) Coherent bundle
C) Multimode
D) Single-mode

Question 30

A higher index of refraction indicates __________.

A) That light is traveling slower
B) That light is traveling faster
C) More signal losses
D) Less signal losses