In this section of Data Communication and Networking – Digital Transmission MCQ (Multiple Choice) Based Questions and Answers,it cover the below lists of topic, All the Multiple Choice Question and Answer (MCQs) have been compiled from the books of Data Communication and Networking by The well known author behrouz A forouzan.

  1. Digital Transmission,parallel or serial in mode,asynchronous serial transmission,synchronous serial transmission MCQs.
  2. Line coding methods,unipolar, polar, or bipolar MCQs.
  3. polar encoding methods , NRZ, RZ, Manchester, and differential Manchester encoding MCQs.
  4. bipolar encoding method , AMI MCQs.
  5. Block coding methods, 4B/5B, 8B/10B, and 8B/6TMCQs.
  6. PCM (pulse code modulation),sampling, quantizing, and line coding MCQs.
  7. Nyquist theorem MCQs.
  8. Shannon capacity MCQs.
  9. Attenuation, distortion, and noise MCQs.
  10. Throughput, propagation speed, and propagation time ,wavelength of a frequency MCQs.

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1. The ________ mode provides synchronization for the entire stream of bits must. In other words, it guarantees that the data arrive at a fixed rate.

  • synchronous
  • asynchronous
  • isochronous
  • none of the above

2. A _________ digital signal includes timing information in the data being transmitted.

  • self-synchronizing
  • self-modulated
  • self-transmitted
  • none of the above

3. In decoding a digital signal, the receiver calculates a running average of the received signal power, called the _______

  • baseline
  • base
  • line
  • none of the above

4. The ________ rate defines the number of data elements sent in 1s; the ______ rate is the number of signal elements sent in 1s

  • data; signal
  • signal; data
  • baud; bit
  • none of the above

5. The signal rate is sometimes called the ____ rate

  • baud
  • bit
  • signal
  • none of the above

6. The data rate is sometimes called the ___ rate

  • baud
  • bit
  • signal
  • none of the above

7. In a _____ scheme, all the signal levels are on one side of the time axis, either above or below.

  • polar
  • bipolar
  • unipolar
  • all of the above

8. In ______ schemes, the voltages are on the both sides of the time axis. For example, the voltage level for 0 can be positive and the voltage level for 1 can be negative.

  • polar
  • bipolar
  • unipolar
  • all of the above

9. In _____, the level of the voltage determines the value of the bit.

  • NRZ-I
  • NRZ-L
  • both (a) and (b)
  • neither (a) nor (b)

10. In ______, the change or lack of change in the level of the voltage determines the value of the bit.

  • NRZ-I
  • NRZ-L
  • both (a) and (b)
  • neither (a) nor (b)

11. The idea of RZ and the idea of NRZ-L are combined into the ________ scheme.

  • Manchester
  • differential Manchester
  • both (a) and (b)
  • neither (a) nor (b)

12. The idea of RZ and the idea of NRZ-I are combined into the ________ scheme

  • Manchester
  • differential Manchester
  • both (a) and (b)
  • neither (a) nor (b)

13. In _______ encoding, the duration of the bit is divided into two halves. The voltage remains at one level during the first half and moves to the other level in the second half. The transition at the middle of the bit provides synchronization.

  • Manchester
  • differential Manchester
  • both (a) and (b)
  • neither (a) nor (b)

14. In ___________ there is always a transition at the middle of the bit, but the bit values are determined at the beginning of the bit. If the next bit is 0, there is a transition; if the next bit is 1, there is none.

  • Manchester
  • differential Manchester
  • both (a) and (b)
  • neither (a) nor (b)

15. In Manchester and differential Manchester encoding, the transition at the middle of the bit is used for __________

  • bit transfer
  • baud transfer
  • synchronization
  • none of the above

16. The minimum bandwidth of Manchester and differential Manchester is ____ that of NRZ.

  • the same as
  • twice
  • thrice
  • none of the above

17. In _______encoding, we use three levels: positive, zero, and negative

  • unipolar
  • bipolar
  • polar
  • none of the above

18. The _____ scheme uses data patterns of size 2 and encodes the 2-bit patterns as one signal element belonging to a four-level signal

  • 4B5B
  • 2B1Q
  • MLT-3
  • none of the above

19. The ______ scheme uses three levels (+V, 0, and -V) and three transition rules to move between the levels.

  • 4B5B
  • 2B1Q
  • MLT-3
  • none of the above

20. _____ substitutes eight consecutive zeros with 000VB0VB

  • B4B8
  • HDB3
  • B8ZS
  • none of the above

21. ______ substitutes four consecutive zeros with 000V or B00V

  • B4B8
  • HDB3
  • B8ZSf
  • none of the above

22. Unipolar, bipolar, and polar encoding are types of _______ encoding.

  • line
  • block
  • NRZ
  • Manchester

23. _______ encoding has a transition at the middle of each bit.

  • RZ
  • Manchester
  • Differential Manchester
  • All the above

24. _______ encoding has a transition at the beginning of each 0 bit.

  • RZ
  • Manchester
  • Differential Manchester
  • All the above

25. PCM is an example of _______ conversion.

  • digital-to-digital
  • digital-to-analog
  • analog-to-analog
  • analog-to-digital

26. If the frequency spectrum of a signal has a bandwidth of 500 Hz with the highest frequency at 600 Hz, what should be the sampling rate, according to the Nyquist theorem?

  • 200 samples/s
  • 500 samples/s
  • 1000 samples/s
  • 1200 samples/s

27. The Nyquist theorem specifies the minimum sampling rate to be_______.

  • equal to the lowest frequency of a signal
  • equal to the highest frequency of a signal
  • twice the bandwidth of a signal
  • twice the highest frequency of a signal

28. Which of the following encoding methods does not provide for synchronization?

  • NRZ-L
  • RZ
  • NRZ-I
  • Manchester

29. Which encoding method uses alternating positive and negative values for 1s?

  • NRZ-I
  • RZ
  • Manchester
  • AMI

30. Which quantization level results in a more faithful reproduction of the signal?

  • 2
  • 8
  • 16
  • 32

31. Block coding can help in _______ at the receiver.

  • Synchronization
  • Error detection
  • Attenuation
  • (a) and (b)

32. In _______ transmission, bits are transmitted simultaneously, each across its own wire.

  • Asynchronous serial
  • Synchronous serial
  • Parallel
  • (a) and (b)

33. In _______ transmission, bits are transmitted over a single wire, one at a time.

  • asynchronous serial
  • synchronous serial
  • parallel
  • (a) and (b)

34. In _______ transmission, a start bit and a stop bit frame a character byte

  • asynchronous serial
  • synchronous serial
  • parallel
  • (a) and (b)

35. In asynchronous transmission, the gap time between bytes is _______

  • fixed
  • variable
  • a function of the data rate
  • zero

36. ___________ conversion involves three techniques: line coding, block coding, and scrambling.

  • Analog-to-digital
  • Digital-to-analog
  • Analog-to-analog
  • Digital-to-digital

37. ________ is the process of converting digital data to a digital signal.

  • Block coding
  • Line coding
  • Scrambling
  • None of the above

38. ______ provides redundancy to ensure synchronization and inherent error detection.

  • Block coding
  • Line coding
  • Scrambling
  • None of the above

39. ________ is normally referred to as mB/nB coding; it replaces each m-bit group with an n-bit group.

  • Block coding
  • Line coding
  • Scrambling
  • None of the above

40. ________ provides synchronization without increasing the number of bits.

  • Scrambling
  • Line coding
  • Block coding
  • None of the above

41. Two common scrambling techniques are ________

  • NRZ and RZ
  • AMI and NRZ
  • B8ZS and HDB3
  • Manchester and differential Manchester

42. The most common technique to change an analog signal to digital data is called __________.

  • PAL
  • PCM
  • sampling
  • none of the above

43. The first step in PCM is ________

  • quantization
  • modulation
  • sampling
  • none of the above

44. There are three sampling methods: __________

  • quantized, sampled, and ideal
  • ideal, sampled, and flat-top
  • ideal, natural, and flat-top
  • none of the above

45. _____ finds the value of the signal amplitude for each sample; ____ finds the change from the previous sample.

  • DM; PCM
  • PCM; DM
  • DM; CM
  • none of the above

46. While there is (are) only _____ way(s) to send parallel data, there is (are) three subclass(es) of serial transmission

  • one; two
  • two; three
  • one; three
  • none of the above

47. In ______ transmission, we send 1 start bit (0) at the beginning and 1 or more stop bits (1s) at the end of each byte.

  • synchronous
  • asynchronous
  • isochronous
  • none of the above

48. In _________ transmission, we send bits one after another without start or stop bits or gaps. It is the responsibility of the receiver to group the bits.

  • synchronous
  • asynchronous
  • isochronous
  • none of the above

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