Communication Systems Quiz

Test Your Knowledge of Communication Fundamentals

This quiz covers essential topics in communication systems including system elements, signals, transmission media, wave propagation, and modulation techniques.

System Elements

Signal Types

Transmission Media

Wave Propagation

Modulation

1 What is the primary purpose of a communication system?

A. To generate signals

B. To transmit information from one point to another

C. To modulate signals

D. To amplify signals

2 Which of the following is NOT a basic element of a communication system?

A. Transmitter

B. Receiver

C. Transmission medium

D. Power supply

3 Which type of signal is represented by discrete values?

A. Analog signal

B. Digital signal

C. Both analog and digital

D. Neither analog nor digital

4 What is the main advantage of digital signals over analog signals?

A. They are easier to generate

B. They are less susceptible to noise

C. They require less bandwidth

D. They are simpler to modulate

5 Which of the following is an example of a guided transmission medium?

A. Radio waves

B. Satellite

C. Optical fiber

D. Infrared

6 What is the term for the bending of waves around obstacles?

A. Reflection

B. Refraction

C. Diffraction

D. Scattering

7 In which propagation method do radio waves travel along the curvature of the Earth?

A. Sky wave propagation

B. Ground wave propagation

C. Space wave propagation

D. Satellite propagation

8 What is modulation?

A. The process of converting digital signals to analog

B. The process of varying one or more properties of a carrier signal

C. The process of amplifying a signal

D. The process of encoding information for security

9 Which modulation type varies the amplitude of the carrier signal?

A. Frequency Modulation (FM)

B. Amplitude Modulation (AM)

C. Phase Modulation (PM)

D. Pulse Code Modulation (PCM)

10 In AM, the bandwidth of the transmitted signal is:

A. Equal to the carrier frequency

B. Twice the highest modulating frequency

C. Half the carrier frequency

D. Same as the modulating frequency

11 Which type of wave propagation is used for TV broadcasting and line-of-sight communication?

A. Ground wave

B. Sky wave

C. Space wave

D. Surface wave

12 What is the main function of a repeater in a communication system?

A. To change the frequency of the signal

B. To amplify and retransmit the signal

C. To modulate the signal

D. To convert the signal from analog to digital

13 Which of the following is an unguided transmission medium?

A. Coaxial cable

B. Twisted pair cable

C. Microwave

D. Fiber optic cable

14 The process of converting an analog signal to a digital signal is called:

A. Modulation

B. Demodulation

C. Quantization

D. Analog-to-digital conversion

15 Which of the following is a disadvantage of FM over AM?

A. FM requires more bandwidth

B. FM is more susceptible to noise

C. FM receivers are simpler

D. FM has lower fidelity

16 In a communication system, the term 'duplex' refers to:

A. Transmission in one direction only

B. Transmission in both directions simultaneously

C. Transmission in both directions but not at the same time

D. Transmission of two signals at once

17 What is the purpose of a carrier signal in modulation?

A. To carry the information over a long distance

B. To increase the power of the signal

C. To reduce noise

D. To convert the signal to digital

18 Which of the following is a digital modulation technique?

A. AM

B. FM

C. PM

D. ASK (Amplitude Shift Keying)

19 The ionosphere layer of the atmosphere is responsible for:

A. Ground wave propagation

B. Space wave propagation

C. Sky wave propagation

D. Satellite communication

20 Which of these factors does NOT affect wave propagation?

A. Frequency of the signal

B. Time of day

C. Atmospheric conditions

D. Color of the transmitter

Communication Systems Quiz | Test Your Knowledge