Unit 3 - Fiber Optic Cabling - Pretest

Fiber-optic cable uses _____ instead of electrical energy to transmit data.

• radio waves

• microwaves

• light pulses

• satellite transmissions

Which of the following is not a benefit of fiber-optic cable over copper-core cable?

• increased security

• less cost

• higher bandwidth

• immune to electromagnetic interference

A(n) _____ wave is a form of energy that behaves like a wave and can travel through a vacuum.

• radio

• sound

• surface

• electromagnetic

Which is NOT a common wavelength for fiber-optic communication?

• 850 nanometers

• 1100 nanometers

• 1300 nanometers

• 1550 nanometers

From the innermost portion moving outward, the order of fiber-optic cable elements are _____.

• glass or plastic core, cladding, buffer, sheath

• glass or plastic core, sheath, buffer, cladding

• glass or plastic core, buffer, cladding, sheath

• glass or plastic core, buffer, sheath, cladding

Major causes of attenuation in fiber-optic cable can be characterized as scattering, dispersion, extrinsic losses, and _____.

• crosstalk

• interference

• Fresnel reflection loss

• magnetic induction

What is the difference between scattering and dispersion?

• Scattering is the loss of signal strength due to impurities in the core material; dispersion is the distortion of a light wave pattern as it reflects off the core cladding.

• Scattering is due to the refraction property differences in the core material; dispersion occurs when intervening material absorbs some of the signal.

• Scattering is loss of signal strength due to physical factors outside the core; dispersion is the loss of signal strength due to impurities in the core material.

• Scattering occurs due to an improper termination; dispersion occurs due to a poorly spliced cable.

Which of the following is not an example of extrinsic loss?

• splices

• connectors

• bends

• induction

Th e broad classifications of fiber-optic cable based on the diameter of the core are _____ and _____

• graded-index, step-index

• step-index, multimode

• mulitmode, single-mode

• graded-index, multimode

Classifications of fiber-optic cable based on the design of the cable core are _____ and _____.

• graded-index, step-index

• step-index, single-mode

• single-mode, graded-index

• multimode, single-mode