Transmission Techniques - data encoding, modulation, broadband and baseband transmission, multiplexing, transmission media, error handling mechanisms - One Line Questions

1. What is the primary characteristic of NRZ-L encoding? — A voltage level represents the bit value (e.g., high for 1, low for 0).
2. What is the primary issue addressed by the 'Return to Zero' (RZ) encoding scheme? — Ensuring synchronization by returning to zero voltage between bits
3. In broadband transmission, how is data transmitted? — As multiple analog signals, each occupying a different frequency band
4. Which modulation technique uses changes in the phase of a carrier wave to represent digital data? — PSK (Phase Shift Keying)
5. Which of the following is a method of analog-to-analog modulation? — AM (Amplitude Modulation)
6. Which modulation technique uses changes in the frequency of a carrier wave to represent digital data? — FSK (Frequency Shift Keying)
7. Which modulation scheme is used in DSL (Digital Subscriber Line) technology? — QAM (Quadrature Amplitude Modulation)
8. Which of the following is a digital-to-digital encoding technique? — Manchester Encoding
9. What is the main difference between baseband and broadband transmission? — Baseband transmits raw digital data, broadband transmits modulated analog signals.
10. In which transmission technique is the entire bandwidth of the communication channel used by a single data signal? — Baseband Transmission
11. Which type of transmission medium uses light pulses to transmit data? —
12. What is the difference between an error detection code and an error correction code? — Detection codes only identify errors, while correction codes can also fix them.
13. What is the main advantage of using TDM (Time Division Multiplexing)? — Guarantees equal bandwidth for all users in each time slot
14. Which of the following is an example of unguided transmission media? — Satellite Communication
15. Which transmission medium is most susceptible to electromagnetic interference (EMI)? — Unshielded Twisted Pair (UTP)
16. Which modulation technique combines changes in amplitude and phase to represent digital data? — QAM
17. What is a disadvantage of using Twisted Pair cable for high-speed data transmission over long distances? — Susceptibility to crosstalk and EMI
18. What is the main advantage of using Coaxial Cable compared to Twisted Pair? — Higher bandwidth and better noise immunity
19. What is the primary characteristic of WDM (Wavelength Division Multiplexing)? — It multiplexes signals based on different wavelengths of light.
20. What is a key limitation of NRZ-L encoding? — It lacks sufficient transitions for clock recovery, especially with long strings of 0s or 1s.
21. What is the main advantage of Fiber Optic cable over other transmission media? — High bandwidth, low attenuation, and immunity to EMI
22. Which of the following is a digital-to-analog encoding technique? — ASK (Amplitude Shift Keying)
23. Which of the following is a type of transmission medium that uses guided propagation? — Twisted Pair Cable
24. Which encoding technique uses a transition in the middle of each bit period to represent data, ensuring self-clocking? — Manchester Encoding
25. Which digital encoding technique uses a transition at the beginning of each bit period, and an additional transition in the middle only if the bit is a '1'? — NRZ-I
26. Which data encoding scheme uses three voltage levels (+V, 0, -V) and alternates the polarity for '1' bits, with no transition for '0' bits? — Bipolar AMI (Alternate Mark Inversion)
27. Which encoding technique inherently provides clock synchronization without requiring a separate clock signal? — Manchester Encoding
28. Which type of error handling mechanism provides the highest level of error detection capability for burst errors? — CRC
29. Which error handling mechanism involves retransmitting the entire block of data if an error is detected? — ARQ (Automatic Repeat reQuest)
30. Which error detection method calculates a sum of the data bytes and sends it along with the data? — Checksum
31. What is the primary advantage of Statistical TDM (STDM) over Synchronous TDM? — More efficient use of bandwidth by dynamically allocating time slots
32. What is the main benefit of using broadband transmission over baseband for long-distance communication? — Higher data rates over longer distances due to signal conditioning
33. In the context of ARQ, what does 'Selective Repeat' aim to improve over 'Go-Back-N'? — Efficiency by only retransmitting the specific corrupted frames
34. Which multiplexing method divides the channel into fixed-length time slots that are allocated to each user, regardless of whether they have data to send? — Synchronous TDM
35. Which type of ARQ protocol uses a negative acknowledgment (NAK) to request retransmission? — Stop-and-Wait ARQ
36. Which multiplexing technique is commonly used in fiber optic communication? — WDM
37. Which type of multiplexing is most suitable for transmitting multiple television channels over a single coaxial cable? — FDM
38. Which multiplexing technique combines multiple signals into a single high-speed data stream by assigning unique codes to each signal? — CDM (Code Division Multiplexing)
39. Which technique is used to transmit multiple digital signals over a single analog channel by assigning each signal a different carrier frequency? — FDM
40. Which of the following is NOT a type of multiplexing? — Amplitude Modulation (AM)
41. What does FDM (Frequency Division Multiplexing) divide the communication channel into? — Sub-channels with different frequencies
42. In broadband transmission, multiple signals can coexist on the same link because they are separated by: — Different frequency bands
43. What is the primary function of a 'demodulator' in a communication system? — To extract the original signal from a modulated carrier wave
44. What is the primary purpose of multiplexing in data communication? — To allow multiple data streams to share a single communication channel
45. What is the main goal of 'error handling mechanisms' in data transmission? — To ensure the integrity and reliability of transmitted data
46. In ARQ protocols, what is the purpose of a positive acknowledgment (ACK)? — To confirm successful reception of data
47. What is the primary function of a modem? — To modulate and demodulate signals for analog transmission
48. What is the purpose of a CRC (Cyclic Redundancy Check) in error handling? — To use polynomial division for detecting burst errors
49. What is the purpose of a parity bit in error detection? — To indicate if the number of '1' bits is odd or even
All One Line Questions
E-Book Transmission Techniques - data encoding, modulation, broadband and baseband transmission, multiplexing, transmission media, error handling mechanisms Online Test Transmission Techniques - data encoding, modulation, broadband and baseband transmission, multiplexing, transmission media, error handling mechanisms Question Bank Transmission Techniques - data encoding, modulation, broadband and baseband transmission, multiplexing, transmission media, error handling mechanisms