Transmission Media Quiz ICE 3203

Which parameter has the most significant impact on the attenuation of a signal in a transmission medium?

• Data rate

• Frequency of the signal

• Transmission distance

• Modulation technique

In twisted-pair cables, increasing the number of twists per unit length primarily helps to:

• Improve signal strength

• Reduce crosstalk and electromagnetic interference

• Increase bandwidth capacity

• Enhance attenuation resistance

The dominant factor that limits the bandwidth of a multimode fiber-optic cable is:

• Chromatic dispersion

• Modal dispersion

• Attenuation

• Polarization mode dispersion

What is the primary reason that single-mode fiber-optic cables are preferred for long-distance communication?

• Lower cost compared to multimode fiber

• Higher attenuation

• Elimination of modal dispersion

• Easier installation

In coaxial cables, the shielding layer serves the primary purpose of:

• Increasing bandwidth capacity

• Reducing signal reflection

• Preventing external electromagnetic interference

• Supporting higher frequency transmission

The skin effect in guided transmission media refers to:

• Increased resistance at lower frequencies

• Attenuation caused by dielectric materials

• Tendency of high-frequency signals to travel near the surface of a conductor

• The absorption of signals by surrounding media

Which factor does NOT directly affect the propagation speed of a signal in a guided transmission medium?

• The material's refractive index

• Signal frequency

• Temperature variations

• Length of the transmission medium

Why do fiber-optic cables experience chromatic dispersion?

• Differences in propagation speeds of different wavelengths of light

• Interference from external electromagnetic sources

• Bending of light waves due to refraction

• The transmission of multiple signals at once

The characteristic impedance of a transmission line is a function of:

• Signal frequency and amplitude

• The inductance and capacitance per unit length

• The type of signal modulation used

• The transmission distance

Which of the following is the biggest disadvantage of using wireless transmission compared to guided media?

• Limited transmission range

• Higher error rates due to environmental factors

• Inability to support broadband communication

• Lower signal propagation speed