ECE 102 Quiz on Comms Concepts

Signal whose physical quantity varies continuously with time

• Digital

• Analog

• Discrete

• Information

Indicate the voltage level in dB with reference to one volt. This unit is used in video or TV measurement

• dBW

• dBk

• dBm

• dBV

Signal attenuation can be corrected by

• Filtering

• Modulation

• Equalization

• Amplification

The bandwidth required for a modulated carrier depends on:

• the carrier frequency

• the signal-to-noise ratio

• the signal-plus-noise to noise ratio 

• the baseband frequency range

Distortion is caused by:

• creation of harmonics of baseband frequencies

• baseband frequencies "mixing" with each other

• shift in phase relationships between baseband frequencies

• all of the above

The wavelength of a radio signal is:

• equal to f/c            

• equal to c/λ

• the distance a wave travels in one period

• how far the signal can travel without distortion

Noise in a communication system originates in:

• the sender

• the channel

• the receiver

• all of the above

In a communications system, noise is most likely to affect the signal

• at the transmitter

• in the channel

• in the information source

• at the destination

Radians per second is equal to:

• 2π f

• f /2π       

• the phase angle

• none of the above

_____ is an electronic instrument used to show both the carrier and the sidebands of a modulated signal in the frequency domain

• Spectrum analyzer

• Oscilloscope

• Digital counter                       

• Frequency counter