TDC1231 Lec3 Quiz

Transmission media are usually categorized as _______.

• fixed or unfixed
• guided or unguided
• determinate or indeterminate
• metallic or nonmetallic

Transmission media lie below the _______ layer.

• physical
• network
• transport
• application

_______ cable consists of an inner copper core and a second conducting outer sheath.

• Twisted-pair
• Coaxial
• Fiber-optic
• Shielded twisted-pair

In fiber optics, the signal is _______ waves.

• light
• radio
• infrared
• very low-frequency

Which of the following is not a guided medium?

• twisted-pair cable
• coaxial cable
• fiber-optic cable
• atmosphere

Twisting in a twisted-pair help reduce the __________.

• length
• cost
• noise
• None of the choices are correct

Noise in a coaxial cable is reduced by _______.

• twisting the cable
• the outer conductor
• the inner conductor
• None of the choices are correct

RG rating is used in _________ cable.

• twisted-pair
• coaxial
• fiber-optic
• None of the choices are correct

The infrared wave has frequencies ________ microwave.

• below
• above
• the same as
• None of the choices are correct

Unguided media is used in _______ and signals are normally broadcast through _______.

• wired communication; free space
• wired communication; fiber-optic cable
• wireless communication; free space
• wireless communication; coaxial cable