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1
Polar and bipolar encoding are types of _______ coding.
A)line
B)block
C)scrambling
D)None of the choices are correct
2
___________ conversion involves three techniques: line coding, block coding, and scrambling.
A)Analog-to-digital
B)Digital-to-analog
C)Analog-to-analog
D)Digital-to-digital
3
In ______ schemes, the voltage level oscillates between a positive and a negative value although it may remain at zero level between the two values.
A)polar
B)bipolar
C)nonpolar
D)None of the choices are correct
4
In _____, the level of the voltage determines the value of the bit.
A)NRZ-I
B)NRZ-L
C)NRZ-I or NRZ-L
D)None of the choices are correct
5
In ______, the change or lack of change in the level of the voltage determines the value of the bit.
A)NRZ-I
B)NRZ-L
C)NRZ-I or NRZ-L
D)None of the choices are correct
6
The idea of RZ and the idea of NRZ-L are combined into the ________ scheme.
A)Manchester
B)differential Manchester
C)Manchester or differential Manchester
D)None of the choices are correct
7
The idea of RZ and the idea of NRZ-I are combined into the ________ scheme.
A)Manchester
B)differential Manchester
C)Manchester or differential Manchester
D)None of the choices are correct
8
In Manchester and differential Manchester encoding, the transition at the middle of the bit is used for __________.
A)bit transfer
B)baud transfer
C)synchronization
D)None of the choices are correct
9
In _______encoding, we use three levels: positive, zero, and negative.
A)polar
B)bipolar
C)nonpolar
D)None of the choices are correct
10
The _____ scheme uses data patterns of size 2 and encodes the 2-bit patterns as one signal element belonging to a four-level signal.
A)4B5B
B)2B1Q
C)B8ZS
D)None of the choices are correct
11
_______ encoding has a transition at the middle of each bit.
A)RZ
B)Manchester
C)Differential Manchester
D)All the choices are correct
12
_______ encoding has a transition at the beginning of each 0 bit.
A)RZ
B)Manchester
C)Differential Manchester
D)All the choices are correct
13
Which of the following encoding methods does not provide for synchronization?
A)NRZ-L
B)RZ
C)NRZ-I
D)Manchester
14
Which encoding method uses alternating positive and negative values for 1s?
A)NRZ-I
B)RZ
C)Manchester
D)AMI
15
Block coding can help in _______ and _________ at the receiver.
A)synchronization and error detection
B)synchronization and attenuation
C)error detection and attenuation
D)error detection and distortion
16
________ is the process of converting digital data to a digital signal.
A)Block coding
B)Line coding
C)Scrambling
D)All of the choices are correct
17
_______ provides redundancy to ensure synchronization and inherent error detection.
A)Block coding
B)Line coding
C)Line coding or block coding
D)None of the choices are correct
18
________ is normally referred to as mB/nB coding; it replaces each m-bit group with an n-bit group.
A)Block coding
B)Line coding
C)Scrambling
D)None of the choices are correct
19
________ provides synchronization without increasing the number of bits.
A)Scrambling
B)Line coding
C)Block coding
D)None of the choices are correct
20
Two common scrambling techniques are ________.
A)NRZ and RZ
B)AMI and NRZ
C)B8ZS and HDB3
D)Manchester and differential Manchester
21
PCM is an example of _______ conversion.
A)digital-to-digital
B)digital-to-analog
C)analog-to-analog
D)analog-to-digital
22
The most common technique to change an analog signal to digital data is called __________.
A)PAL
B)PCM
C)sampling
D)None of the choices are correct
23
The first step in PCM is ________.
A)quantization
B)modulation
C)sampling
D)None of the choices are correct
24
______ finds the value of the signal amplitude for each sample; ____ finds the change from the previous sample.
A)DM; PCM
B)PCM; DM
C)DM; CM
D)None of the choices are correct





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