Data Communication and Networking – Digital to Digital Encoding Methods – Unipolar / Bipolar / Polar MCQs

This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Digital to Digital Encoding Methods- Unipolar – Bipolar – Polar”. 
 

  1. Unipolar
  2. Bipolar
  3. Polar
    1. NRZ
      1. NRZ-L
      2. NRZ-I
    2. RZ
    3. Biphase
      1. Manchester
      2. Differential Manchester

 

1
. In _______ encoding one amplitude represents a 1 bit and zero amplitude represents a 0 bit (or vice versa).
  • unipolar
  • polar
  • bipolar
  • b and c
2
. In _______ encoding positive and negative amplitudes represent the bits
  • unipolar
  • polar
  • bipolar
  • b and c
3
. In _______ encoding positive, negative, and zero amplitudes represent the bits
  • unipolar
  • polar
  • bipolar
  • b and c
4
. A digital signal has its 0 bits represented by 0 volts and its 1 bit represented by 5 volts. This is _______ encoding.
  • unipolar
  • polar
  • bipolar
  • b and c
5
. A digital signal has its 0 bits represented by 0 volts and its 1 bit represented by -5 volts or 5 volts. This is _______ encoding
  • unipolar
  • polar
  • bipolar
  • b and c
6
. A digital signal has its 0 bits represented by -5 volts and its 1 bit represented by 5. This is _______ encoding
  • unipolar
  • polar
  • bipolar
  • b and c
7
. The DC component is a serious problem for _______ encoding
  • unipolar
  • polar
  • bipolar
  • b and c
8
. Unipolar encoding has a DC component because the average _______ of the signal is nonzero
  • amplitude
  • frequency
  • phase
  • period
9
. NRZ-L is a _______ encoding method.
  • unipolar
  • polar
  • bipolar
  • none of the above
10
. NRZ-I is a _______ encoding method.
  • unipolar
  • polar
  • bipolar
  • none of the above
11
. RZ is a _______ encoding method.
  • unipolar
  • polar
  • bipolar
  • none of the above
12
. Manchester encoding is a _______ encoding method
  • unipolar
  • polar
  • bipolar
  • none of the above
13
. Differential Manchester encoding is a _______ encoding method.
  • unipolar
  • polar
  • bipolar
  • none of the above
14
. AMI is a _______ encoding method
  • unipolar
  • polar
  • bipolar
  • none of the above
15
. B8ZS is a _______ encoding method.
  • unipolar
  • polar
  • bipolar
  • none of the above
16
. HDB3 is a _______ encoding method.
  • unipolar
  • polar
  • bipolar
  • none of the above
17
. _______ encoding is superior to _______ encoding because the problem of the DC component is alleviated
  • Unipolar; polar
  • Polar; bipolar
  • Polar; unipolar
  • Unipolar; bipolar
18
. Ethernet LANs use _______ encoding
  • RZ
  • Manchester
  • differential Manchester
  • NRZ-I
19
. Token Ring LANs use _______ encoding
  • RZ
  • Manchester
  • differential Manchester
  • NRZ-I
20
. In _______ encoding the transition between a positive and a negative voltage represents a 1 bit
  • NRZ-I
  • NRZ-L
  • Manchester
  • differential Manchester
21
. In _______ encoding halfway through each bit interval, the signal returns to zero.
  • NRZ-I
  • NRZ-L
  • RZ
  • Manchester
22
. RZ encoding requires _______ signal change(s) to encode one bit.
  • no
  • one
  • two
  • three
23
. Manchester and differential Manchester encoding are both types of _______ encoding
  • unipolar
  • NRZ
  • biphase
  • bipolar
24
. Which of the following is not a type of bipolar encoding?
  • AMI
  • RZ
  • B8ZS
  • HDB3
25
. The DC component problem is handled in AMI through _______
  • transitions at the beginning of each bit interval
  • transitions at the middle of each bit interval
  • alternate positive and negative amplitudes for the 1 bits
  • alternate positive and negative amplitudes for the 0 bits
26
. The DC component problem is handled in pseudoternary AMI through _______
  • transitions at the beginning of each bit interval
  • transitions at the middle of each bit interval
  • alternate positive and negative amplitudes for the 1 bits
  • alternate positive and negative amplitudes for the 0 bits
27
. The synchronization problem for long streams of 1s is handled in AMI through _______.
  • transitions at the beginning of each bit interval
  • transitions at the middle of each bit interval
  • alternate positive and negative amplitudes for the 1 bits
  • alternate positive and negative amplitudes for the 0 bits
28
. AMI is an acronym for _______.
  • asynchronous mark inversion
  • alternate mark inversion
  • active mapped inversion
  • alternate mask inversion
29
. _______ is a variation of AMI.
  • B8ZS
  • HDB3
  • UB40
  • a and b
30
. _______ is an attempt to synchronize long strings of 0s
  • B8ZS
  • HDB3
  • UB40
  • a and b
31
. In _______ encoding, anytime there are eight or more consecutive 0 bits, violations are deliberately introduced
  • B8ZS
  • HDB3
  • HDLC
  • B4ZS
32
. In _______ encoding, anytime there are four or more consecutive 0 bits, violations are deliberately introduced
  • B8ZS
  • HDB3
  • HDLC
  • B4ZS
33
. _______ encoding is used in North America to provide synchronization of strings of 0s.
  • B8ZS
  • HDB3
  • HDLC
  • B4ZS
34
. _______ encoding is used in Europe and Japan to provide synchronization of strings of 0s
  • B8ZS
  • HDB3
  • HDLC
  • B4ZS
35
. In B8ZS encoding, a string of eight consecutive 0s produces _______
  • one violation
  • two violations
  • three violations
  • any of the above
36
. In HDB3 encoding, a string of four consecutive 0s produces _______.
  • one violation
  • two violations
  • three violations
  • any of the above

 
 
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