22414 Data Communication and Computer Network (DCC) | Unit 1 MCQs

Department of Computer Engineering

Academic Year 2020-21

Class: SE Computer & IT

Subject: 22414 Data Communication and Computer Network (DCC) 

MCQ Question Bank with Answers

22414 Data Communication and Computer Network (DCC) MCQs | As we all know due to this pandemic Exams are going to be in online mode So we are providing MSBTE MCQs as per the I Scheme syllabus stayed tuned with cwipedia. Download all 4th Semester MCQs with answer pdf.

 

Unit I

1. In a _______ connection, more than two devices can share a single link.
   (a) Point-to-point
   (b) Primary
   (c) Multi-point
   (d) Secondary

 

2. Communication between a computer and a keyboard involves ______________
   transmission
   (a) Full-duplex
   (b) Half-duplex
   (c) Simplex
   (d) None of these

 

3. The information to be communicated in a data communications system is the ________
   a. Medium
   b. Protocol
   c. Transmission
   d. Message

 

4. Frequency of failure and network recovery time after a failure are measures of the
   _______ of a network.
   a. Performance
   b. Security
   c. Reliability
   d. Feasibility

5. In _______ transmission, the channel capacity is shared by both communicating devices at all times.
   a. Full-duplex
   b. Simplex
   c. Half-duplex
   d. Half-Simplex

 

6. An unauthorized user is a network _______ issue.
   a. Performance
   b. Reliability
   c. Security
   d. All of the above

 

7. A television broadcast is an example of _______ transmission.
   a. Half-duplex
   b. Full-duplex
   c. Simplex
   d. Automatic

 

8. A _______ connection provides a dedicated link between two devices.
   a. Multi-point
   b. Point-to-Point
   c. Primary
   d. Secondary

9. Before data can be transmitted, they must be transformed to ________.
   a. Electromagnetic signals
   b. Periodic signals
   c. Aperiodic signals
   d. Low-frequency sine waves

10. A periodic signal can always be decomposed into ________.
    a. Exactly an odd number of sine waves
    b. A set of sine waves, one of which must have a phase of 0°
    c. A set of sine waves
    d. None of the above

11. . In a frequency-domain plot, the horizontal axis measures the ________.
    a. Frequency
    b. Peak amplitude
    c. Phase
    d. Slope

12. In a time-domain plot, the vertical axis is a measure of ________.
    a. Frequency
    b. Phase
    c. Amplitude
    d. Time

13. As frequency increases, the period ________.
    a. Decreases
    b. Increases
    c. Remains the same
    d. Doubles

14. When propagation speed is multiplied by propagation time, we get the ________.
    a. Throughput
    b. Wavelength of the signal
    c. Distance a signal or bit has traveled
    d. Distortion factor

15. Propagation time is ________ proportional to distance and ________ proportional to propagation speed.
    a. Inversely; directly
    b. Inversely; inversely
    c. Directly; inversely
    d. Directly; directly

 

16. Wavelength is ________ proportional to propagation speed and ________ proportional to period.
    a. Directly; directly
    b. Inversely; directly
    c. Directly; inversely
    d. Inversely; inversely

 

17. Which of the following can be determined from a frequency-domain graph of a signal?
    a. Phase
    b. Power
    c. Frequency
    d. Bandwidth

 

18. Which of the following can be determined from a frequency-domain graph of a signal?
    a. Phase
    b. Bandwidth
    c. Power
    d. All the above

19. In a frequency-domain plot, the vertical axis measures the ________.
    a. Frequency
    b. Peak amplitude
    c. Phase
    d. Slope

 

20. Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.
    a. One-half
    b. Twice
    c. The same as
    d. Indeterminate from

 

21. The wavelength of green light in air is ________ the wavelength of green light in fiber-optic cable.
    a. Greater than
    b. Less than
    c. Equal to
    d. None of the above

 

22. A sine wave is ________.
    a. Aperiodic and continuous
    b. Periodic and discrete
    c. Aperiodic and discrete
    d. Periodic and continuous

23. _______ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.
    a. Distortion
    b. Noise
    c. Decibel
    d. Attenuation

24. _______ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.
    a. Attenuation
    b. Noise
    c. Distortion
    d. Decibel

25. _______ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.
    a. Attenuation
    b. Noise
    c. Distortion
    d. Decibel

26. The ________ has units of meters/second or kilometers/second.
    a. Throughput
    b. Propagation time
    c. Propagation speed
    d. (b) and (c)

27. ______ has units of bits/second.
    a. Throughput
    b. Propagation speed
    c. Propagation time
    d. (b) and (c)

28. The ________ has units of seconds.
    a. Throughput
    b. Propagation time
    c. Propagation speed
    d. (a) and (b)

 

 

29. The wavelength of a signal depends on the ________.
    a. Frequencies of the signal
    b. Medium
    c. Phase of the signal
    d. (a) and (b)

30. Block coding can help in _______ at the receiver.
    a. Synchronization
    b. Error detection
    c. Attenuation
    d. (a) and (b)

 

31. In _______ transmission, bits are transmitted simultaneously, each across its own wire.
    a. Parallel
    b. Asynchronous serial
    c. Synchronous serial
    d. (a) and (b)

32. Unipolar, bipolar, and polar encoding are types of _______ encoding.
    a. Block
    b. Line
    c. NRZ
    d. Manchester

 

33. _______ encoding has a transition at the middle of each bit.
    a. RZ
    b. Manchester
    c. Differential Manchester
    d. All the above

 

34. ______ encoding has a transition at the beginning of each 0 bit.
    a. Differential Manchester
    b. RZ
    c. Manchester
    d. All the above

35. PCM is an example of _______ conversion.
    a. Analog-to-analog
    b. Analog-to-digital
    c. Digital-to-digital
    d. Digital-to-analog

36. One factor in the accuracy of a reconstructed PCM signal is the _______.
    a. Number of bits used for quantization
    b. Signal bandwidth
    c. Carrier frequency
    d. Baud rate

 

37. In asynchronous transmission, the gap time between bytes is _______.
    a. Fixed
    b. A function of the data rate
    c. Variable
    d. Zero

 

38. Synchronous transmission does not have _______.
    a. A start bit
    b. A stop bit
    c. Gaps between bytes
    d. All the above

 

 

39. Which encoding type always has a nonzero average amplitude?
    a. Polar
    b. Bipolar
    c. Uni-polar
    d. All the above

 

40. Which of the following encoding methods does not provide for synchronization?
    a. Manchester
    b. NRZ-L
    c. RZ
    d. NRZ-I

 

41. Which encoding method uses alternating positive and negative values for 1s?
    a. Manchester
    b. AMI
    c. NRZ-I
    d. RZ

 

42. In PCM, an analog-to- _______ conversion occurs.
    a. Analog
    b. Digital
    c. QAM
    d. Differential

 

43. RZ encoding involves _______ signal levels.
    a. Five
    b. Four
    c. Three
    d. Two

 

44.  In _______ transmission, a start bit and a stop bit frame a character byte.
    a. Synchronous serial
    b. Asynchronous serial
    c. Parallel
    d. (a) and (b)

 

45.  The Nyquist theorem specifies the minimum sampling rate to be_______.
    a. Twice the bandwidth of a signal
    b. Twice the highest frequency of a signal
    c. Equal to the lowest frequency of a signal
    d. Equal to the highest frequency of a signal

 

46.  Pulse rate is always _______ the bit rate.
    a. Less than
    b. Less than or equal to
    c. Greater than
    d. Greater than or equal to

 

47. AM and FM are examples of ________ modulation.
    a. Analog-to-analog
    b. Analog-to-digital
    c. Digital-to-digital
    d. Digital-to-analog

 

48. In QAM, both phase and ________ of a carrier frequency are varied.
    a. Frequency
    b. Bit rate
    c. Amplitude
    d. Baud rate

 

49. Which of the following is most affected by noise?
    a. PSK
    b. FSK
    c. QAM
    d. ASK

 

50. ASK, PSK, FSK, and QAM are examples of ________ modulation.
    a. Analog-to-analog
    b. Analog-to-digital
    c. Digital-to-digital
    d. Digital-to-analog

 

51. As the bit rate of an FSK signal increases, the bandwidth ________.
    a. Remains the same
    b. Decreases
    c. Increases
    d. Doubles

 

 

52. In 16-QAM, there are 16 ________.
    a. Phases
    b. Combinations of phase and amplitude
    c. Amplitudes
    d. bps

 

 

53. Which modulation technique involves tribits, eight different phase shifts, and one amplitude?
    a. FSK
    b. ASK
    c. 4-PSK
    d. 8-PSK

54. A modulated signal is formed by ________.
    a. Changing the carrier wave by the modulating signal
    b. Quantization of the source data
    c. Changing the modulating signal by the carrier wave
    d. Sampling at the Nyquist frequency

55. When an ASK signal is decomposed, the result is ________.
    a. An infinite number of sine waves
    b. Always one sine wave
    c. Always two sine waves
    d. None of the above

56. The bandwidth of an FM signal requires 10 times the bandwidth of the _______ signal.
    a. Bipolar
    b. Sampling
    c. Carrier
    d. Modulating

 

57. Modulation of an analog signal can be accomplished through changing the ________ of the carrier signal.
    a. Amplitude
    b. Frequency
    c. Phase
    d. Any of the above

 

58. For a telephone line, the bandwidth for voice is usually _______ the bandwidth for data.
    a. Less than
    b. Greater than
    c. Twice
    d. Equivalent to

 

59. For a given bit rate, the minimum bandwidth for ASK is ________ the minimum bandwidth for FSK.
    a. Less than
    b. Equivalent to
    c. Greater than
    d. Twice