Transmission Media

Transmission media are usually categorized as __________.

• fixed or unfixed

• guided or unguided

• determinate or indeterminate

• metallic or non-metallic

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

• twisted-pair

• coaxial

• fiber-optic

• shielded twisted-pair

In fiber optics, the signal source is _____ waves.

• light

• LED

• radio

• infrared

At the lower end of the electromagnetic spectrum we have __________

• radio waves

• power and voice

• ultraviolet light

• infrared light

_______are the highest frequency electromagnetic waves in use for data communications

• visible light waves

• cosmic rays

• radio waves

• gamma rays

Smoke signals are an example of communication through ________

• a guided medium

• an unguided medium

• a refractive medium

• a small or large medium

Which of the following primarily uses guided media?

• cellular telephone system

• local telephone system

• satellite communications

• radio broadcasting

Which of the following is not a guided medium?

• twisted-pair cable

• coaxial cable

• fiber-optic cable

• atmosphere

In an environment with many high-voltage devices, the best transmission medium would be _______.

• twisted-pair cable

• coaxial cable

• optical fiber

• the atmosphere

What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair?

• inner conductor

• diameter of the cable

• outer conductor

• insulating material