Communication Systems in Electrical Engineering - Exam
  • 1. Communication systems in electrical engineering involve the transmission, reception, processing, and storage of information through electrical signals. These systems play a crucial role in facilitating the exchange of data and messages between different devices and users. Key components of communication systems include transmitters, receivers, channels, and protocols. The design and analysis of communication systems aim to ensure efficient and reliable transfer of information while considering factors such as bandwidth, noise, and data rate. Engineers in this field work on developing technologies such as wireless communication, optical networks, and satellite communication to enhance connectivity and enable communication across various platforms and distances.

    What is the Shannon capacity formula in communication systems?
A) C = B * SNR
B) C = log2(1 + SNR)
C) C = B / log2(1 + SNR)
D) C = B * log2(1 + SNR)
  • 2. What is the role of a repeater in communication systems?
A) To digitize analog signals
B) To filter out noise from signals
C) To modulate signals
D) To amplify and retransmit signals
  • 3. What is the function of a demodulator in a communication system?
A) To encode the message signal
B) To attenuate the signal
C) To extract the original message signal from the modulated signal
D) To transmit the signal
  • 4. What does BER stand for in communication systems?
A) Bit Error Rate
B) Baseband Error Rate
C) Bandwidth Error Rate
D) Binary Encoding Rate
  • 5. What is the Nyquist theorem used for in communication systems?
A) To determine the maximum data rate over a channel
B) To modulate signals
C) To amplify signals
D) To equalize signals
  • 6. What is the purpose of error detection codes in communication systems?
A) To increase data transmission speed
B) To detect and correct errors in transmitted data
C) To encrypt data
D) To compress data
  • 7. In communication systems, what does ADC stand for?
A) Analog-to-Digital Converter
B) Automatic Data Communication
C) Amplitude Domain Converter
D) Analog Digital Channel
  • 8. What is meant by the term 'duplexing' in communication systems?
A) Error correction in data transmission
B) Frequency modulation of signals
C) Analog to digital signal conversion
D) Simultaneous transmission and reception on a common channel
  • 9. What is the purpose of a splitter in distribution systems?
A) To combine signals into a single path
B) To filter out noise
C) To amplify signals
D) To divide a signal into multiple paths
  • 10. What is the primary function of a router in communication networks?
A) To amplify signals
B) To modulate signals
C) To convert analog signals to digital signals
D) To route data packets between different networks
  • 11. What is the purpose of a transceiver in communication systems?
A) To amplify signals
B) To encode signals
C) To both transmit and receive signals
D) To filter out noise
  • 12. What does the acronym CDMA stand for in communication systems?
A) Centralized Data Modulation Algorithm
B) Channel Division Multiplexing Array
C) Code Division Multiple Access
D) Coordinated Domain Modulation Approach
  • 13. Which of the following is true about the bandwidth of a signal in communication systems?
A) It is the time duration of the signal
B) It is the range of frequencies occupied by the signal
C) It is the amplitude of the signal
D) It is the rate of signal transmission
  • 14. What is the role of a network switch in communication networks?
A) To connect devices within a local area network and forward data packets
B) To encrypt data
C) To convert digital signals to analog signals
D) To modulate signals
  • 15. What does the term 'echo cancellation' refer to in communication systems?
A) Shifting signals in time
B) Amplifying echo in signals
C) Creating echo effects on signals
D) Removing echo from transmitted signals
  • 16. Which protocol is commonly used for email communication over the Internet?
A) TCP (Transmission Control Protocol)
B) HTTP (Hypertext Transfer Protocol)
C) FTP (File Transfer Protocol)
D) SMTP (Simple Mail Transfer Protocol)
  • 17. What is a multiplexer used for in communication systems?
A) To decompress audio signals
B) To combine multiple input signals into a single output
C) To convert analog signals to digital signals
D) To detect errors in transmitted data
  • 18. In digital communication, what does 'SNR' stand for?
A) Symbol Noise Reduction
B) Signal-to-Noise Ratio
C) Signal Neutralization Rate
D) System Network Requirement
  • 19. Which of the following is an example of a digital communication protocol?
A) Analog TV
B) FM Radio
C) Satellite Communication
D) TCP/IP
  • 20. Which of the following is a common frequency band used for Wi-Fi communication?
A) 2.4 GHz
B) 10 kHz
C) 500 MHz
D) 1000 GHz
  • 21. Which of the following components is typically used for signal amplification in a communication system?
A) Transmitter
B) Modem
C) Amplifier
D) Antenna
  • 22. What does the acronym 'AM' stand for in communication systems?
A) Audio Modulation
B) Amplification Method
C) Analog Multiplexing
D) Amplitude Modulation
  • 23. Which of the following is a digital modulation technique?
A) Frequency Hopping Spread Spectrum
B) Quadrature Amplitude Modulation (QAM)
C) Continuous Wave Modulation
D) Phase Shift Keying (PSK)
  • 24. Which type of modulation is used in Bluetooth communication technology?
A) Frequency Hopping Spread Spectrum (FHSS)
B) Phase Modulation
C) Amplitude Modulation
D) Pulse Width Modulation
  • 25. Which of the following is a common method for achieving error detection in digital communication?
A) Frequency Division Multiplexing (FDM)
B) Amplitude Modulation (AM)
C) Pulse Code Modulation (PCM)
D) Cyclic Redundancy Check (CRC)
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