Data Communication and networking Mcqs for the preparation of Competitive exams

51. ________ 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

View Answer
 c. Distortion

52. ________ 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

View Answer
b. Noise 

 

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

View Answer
 c. Propagation speed

 

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

View Answer
 a. Throughput 

 

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

View Answer
 b. Propagation time  

 

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

View Answer
d. (a) and (b)

 

57. Which encoding technique attempts to solve the loss of synchronization due to long strings of 0s?
a. NRZ
b. BnZS
c. AMI
d. (a) and (b)

View Answer
 b. BnZS

 

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

View Answer
 d. (a) and (b)  

 

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

View Answer
 a. Parallel

 

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

View Answer
 b. Line

 

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