Radio and TV Engineering ECE 151 Lecture 1: Introduction- Part I

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What is the purpose of modulation in a communication system?

To convert analog signals to digital form for transmission
To amplify the signal for transmission over long distances
To allow more than one signal to be transmitted over a single medium
To make the information signal more compatible with the transmission medium (correct)

Which of the following is an example of baseband transmission?

Transmitting multiple signals over a single fiber optic cable using multiplexing
Sending voice signals over a telephone line
Broadcasting a radio signal using a modulated carrier wave
Transmitting digital signals over a coaxial cable in a computer network (correct)

What is the purpose of multiplexing in a communication system?

To convert analog signals to digital form for transmission
To allow more than one signal to be transmitted concurrently over a single medium (correct)
To modulate the carrier signal with the information signal
To amplify the signal for transmission over long distances

Which of the following communication systems is an example of half-duplex communication?

Family Radio communication (B) Signup and view all the answers

What is the role of the carrier signal in a modulated communication system?

To modify the baseband information signal for efficient transmission over the medium (A) Signup and view all the answers

In a telephone conversation, what type of communication is taking place?

Full-duplex communication (B) Signup and view all the answers

What is the frequency range for microwaves?

1 GHz to 30 GHz (B) Signup and view all the answers

What is the typical operating frequency of a microwave oven?

2.45 GHz (B) Signup and view all the answers

Which frequency range is used for satellite communication and radar?

Microwaves (C) Signup and view all the answers

What is the frequency range for Superhigh Frequencies (SHFs)?

3 GHz to 30 GHz (B) Signup and view all the answers

What term is used to describe frequencies higher than 30 GHz?

Millimeter waves (B) Signup and view all the answers

What is the definition of bandwidth?

All of the above (D) Signup and view all the answers

Which frequency range is primarily used for AM radio broadcasting?

Medium Frequencies (MFs) (A) Signup and view all the answers

Where do all kinds of simplex broadcasting and half duplex two-way radio communication take place?

High Frequencies (HFs) (A) Signup and view all the answers

Which frequency range is known as short waves?

High Frequencies (HFs) (C) Signup and view all the answers

Which frequency range is used by FM radio broadcasting and television channels 2 through 13?

Very High Frequencies (VHFs) (C) Signup and view all the answers

In which frequency range are UHF TV channels 14 through 51 located?

Ultrahigh Frequencies (UHFs) (A) Signup and view all the answers

What is the major application of frequencies in the Medium Frequencies range?

AM Radio Broadcasting (C) Signup and view all the answers

What is the formula for calculating voltage gain (AV)?

$A_V = V_{out} / V_{in}$ (B) Signup and view all the answers

What is the formula for calculating power gain (AP)?

$A_P = P_{out} / P_{in}$ (D) Signup and view all the answers

What is the formula for calculating the reactance of a capacitor (XC)?

$X_C = 1 / (2\pi fC)$ (D) Signup and view all the answers

What is the formula for calculating the reactance of an inductor (XL)?

$X_L = 2\pi fL$ (B) Signup and view all the answers

What does attenuation refer to in electronic circuits?

The reduction in amplitude of a signal (C) Signup and view all the answers

What is the main purpose of a communication system?

To receive the message and relay it to a human (B) Signup and view all the answers

What is the first step in sending a message in an electronic communication system?

Converting the message into electronic form (C) Signup and view all the answers

What is the communication channel in a communication system?

The medium by which the electronic signal is sent from one place to another (B) Signup and view all the answers

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

To translate the sound into an electronic audio signal (C) Signup and view all the answers

What is the general term applied to any phenomenon that degrades or interferes with the transmitted information?

Noise (B) Signup and view all the answers

What is the purpose of a camera in a communication system?

To convert the light information in the scene to a video signal (C) Signup and view all the answers