PCE quizz 1

What is modulation in communication systems?

• Modulation in communication systems is the technique of varying a carrier signal to transmit information.

• Modulation refers to the method of encoding data into a digital format.

• Modulation is the process of amplifying a signal without altering its frequency.

• Modulation is the technique of filtering out noise from a communication signal.

Name three common modulation methods used in communication engineering.

• Quadrature Amplitude Modulation (QAM)

• Amplitude Shift Keying (ASK)

• Pulse Code Modulation (PCM)

• Amplitude Modulation (AM), Frequency Modulation (FM), Phase Modulation (PM)

What is the purpose of amplitude modulation (AM)?

• To increase the frequency of a signal for better reception.

• To reduce noise in audio signals by filtering.

• The purpose of amplitude modulation (AM) is to transmit information over radio waves by varying the amplitude of a carrier signal.

• To enhance the visual quality of television broadcasts.

Describe the basic components of a communication system.

• Encoder, Decoder, Feedback, Data

• Transmitter, Channel, Receiver, Noise

• Modulator, Filter, Amplifier, Signal

• Source, Medium, Protocol, Message

Define the term 'carrier wave' in the context of modulation.

• A carrier wave is a type of sound wave used in music.

• A carrier wave is a physical object that carries electronic devices.

• A carrier wave is a waveform used in modulation to carry information by varying its amplitude, frequency, or phase.

• A carrier wave is a signal that only transmits data without modulation.

What is the role of a modulator in a communication system?

• To amplify the carrier signal for better reception.

• To filter out noise from the communication channel.

• To decode the information received from the carrier signal.

• The role of a modulator in a communication system is to encode information onto a carrier signal for transmission.

Explain the concept of bandwidth in relation to modulation.

• Bandwidth is the amount of data stored in a device.

• Modulation is the process of increasing the power of a signal.

• Bandwidth in modulation is the range of frequencies used to transmit information, affecting data transmission capacity.

• Bandwidth refers to the physical size of a transmission medium.

What is the significance of the modulation index in amplitude modulation?

• The modulation index is irrelevant to the quality of the audio signal.

• The modulation index indicates the degree of modulation and affects the bandwidth of the AM signal.

• The modulation index only affects the amplitude of the carrier wave.

• The modulation index determines the frequency of the carrier wave.

What are the main applications of amplitude modulation?

• Satellite communication systems

• Fiber optic data transmission

• Main applications of amplitude modulation include AM radio broadcasting, two-way radio communications, aviation communications, and television broadcasting.

• Digital signal processing

How do noise and interference impact communication systems?

• Noise and interference only affect visual communication, not audio.

• Noise enhances signal clarity and improves communication efficiency.

• Noise and interference degrade signal quality, reduce communication reliability, and increase error rates.

• Interference has no effect on communication systems.