Basics of Analog and Digital Communication — MCQs – EE

1. Communication is the process of:
(A) Storing information
(B) Transmitting information from one point to another
(C) Amplifying a signal
(D) Generating carrier waves

2. The two main types of communication are:
(A) Analog and Digital
(B) Wired and Wireless
(C) Linear and Nonlinear
(D) Audio and Video

3. In analog communication, the signal is:
(A) Continuous in time and amplitude
(B) Discrete in nature
(C) Binary coded
(D) Quantized

4. In digital communication, the signal is represented as:
(A) 0s and 1s
(B) Continuous waves
(C) Sinusoidal signals
(D) Random pulses

5. Analog communication systems use:
(A) Continuous signals
(B) Discrete signals
(C) Digital bits
(D) Quantized samples

6. Digital communication systems use:
(A) Discrete-time and discrete-amplitude signals
(B) Continuous-time and continuous-amplitude signals
(C) Analog carriers only
(D) Voltage regulators

7. The main advantage of digital communication over analog is:
(A) Better noise immunity
(B) Simple circuitry
(C) Lower bandwidth requirement
(D) Infinite range

8. Analog communication is more susceptible to:
(A) Noise and distortion
(B) Data compression
(C) Synchronization errors
(D) Coding errors

9. Digital signals are more:
(A) Immune to noise
(B) Sensitive to amplitude variations
(C) Difficult to regenerate
(D) Prone to distortion

10. Modulation in communication systems is used to:
(A) Vary carrier characteristics with the message signal
(B) Store data
(C) Reduce transmission distance
(D) Eliminate filtering

11. The main types of analog modulation are:
(A) Amplitude, Frequency, and Phase modulation
(B) Pulse, Binary, and Delta modulation
(C) PCM, DPCM, and DM
(D) ASK, FSK, and PSK

12. The main types of digital modulation are:
(A) ASK, FSK, and PSK
(B) AM, FM, and PM
(C) PCM, PWM, and PPM
(D) DSB, SSB, and VSB

13. The process of converting analog signals into digital form is called:
(A) Sampling and Quantization
(B) Filtering
(C) Amplification
(D) Modulation

14. In analog communication, the information is carried by:
(A) Continuous variations of a signal parameter
(B) Binary pulses
(C) Quantized levels
(D) Coded sequences

15. In digital communication, the information is carried by:
(A) Discrete symbols or bits
(B) Continuous waveforms
(C) Amplitude variations
(D) Phase shifts only

16. The main disadvantage of analog communication is:
(A) Poor noise immunity
(B) Complex error correction
(C) Difficult synchronization
(D) Low power efficiency

17. In digital communication, error detection and correction are:
(A) Easier to implement
(B) Impossible
(C) Unnecessary
(D) Very expensive

18. Bandwidth requirement of digital communication is usually:
(A) Higher than analog
(B) Lower than analog
(C) Equal to analog
(D) Zero

19. Analog communication is used in systems like:
(A) AM and FM radio
(B) Internet routers
(C) Mobile data transfer
(D) Computer networks

20. Digital communication is used in systems like:
(A) Internet and computer networks
(B) Analog radios
(C) Telephone amplifiers
(D) Tape recorders

21. Pulse Code Modulation (PCM) is a type of:
(A) Digital modulation
(B) Analog modulation
(C) Amplitude modulation
(D) Frequency modulation

22. One advantage of digital transmission is:
(A) Ability to regenerate signals at repeaters
(B) High susceptibility to noise
(C) Low error detection capability
(D) Poor signal quality

23. Analog communication is simpler in:
(A) Implementation and hardware design
(B) Error control
(C) Encryption
(D) Multiplexing

24. Digital communication provides better:
(A) Security and encryption
(B) Continuous transmission
(C) Frequency response
(D) Simplicity of circuits

25. The sampling theorem is fundamental to:
(A) Digital communication
(B) Analog modulation
(C) Frequency analysis
(D) Power transmission

26. The main disadvantage of digital systems is:
(A) High bandwidth requirement
(B) Poor noise immunity
(C) Low reliability
(D) Difficult error correction

27. Analog communication is preferred for:
(A) Real-time audio and broadcast systems
(B) High-speed data networks
(C) Secure communication
(D) Computer systems

28. Digital communication is preferred for:
(A) Data and computer-based communication
(B) Long-distance analog signals
(C) Voice-only transmission
(D) Simple telephone systems

29. In digital communication, data transmission accuracy can be improved by:
(A) Using error detection and correction codes
(B) Increasing transmission noise
(C) Reducing sampling rate
(D) Avoiding modulation

30. The primary goal of any communication system is to:
(A) Transmit information accurately and efficiently
(B) Increase power output
(C) Reduce signal amplitude
(D) Store data indefinitely