# Digital Communications Questions and Answers – Baseband Systems and Signal Transmission through Linear Systems

This set of Digital Communication Puzzles focuses on “Baseband System and Signal Transmission through Linear Systems”.

1. The process of data conversion along with formatting the data is called as ______
a) Formatting
b) Modulation
c) Source coding
d) Amplifying

Explanation: The process of converting source information to a digital signal and also formatting it is called as source coding.

2. Formatting is the process which includes
a) Pulse code modulation
b) Sampling
c) Quantization
d) All of the mentioned

Explanation: Formatting is the process in which the source information is converted to digital signals using methods like sampling, pulse code modulation etc.

a) Sampling
b) Quantization
c) Coding
d) All of the mentioned

Explanation: Textual information, analog information and digital information undergoes different processes before converting to binary or digital data. The method used for converting analog information are the given methods.

4. The process that transforms text into binary digits is called as _______
a) Binary coding
b) Data coding
c) Character coding
d) Sampling

Explanation: According to the definition the process of converting textual data to binary digits is called as character coding.

5. For the number of bits, k=1 and number of symbols, M=2 the system is called as
a) Unary
b) Binary
c) Quarternary
d) None of the mentioned

Explanation: For k number of bits, the number of symbols are M=2k. For k=1 and M=2 the system is called as binary coding.
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6. Perform the bit stream partitioning and find the 8-ary waveform for the word ‘THINK’.
a) 1204443464
b) 4643444021
c) 1240443464
d) none of the mentioned

Explanation: “THINK”
ASCII value: T-001010 ; H-000100; I-100100; N-011100; K-110100
8-ary symbols(split into 3 bits): 1 2 0 4 4 4 3 4 6 4.

7. Find the 32-ary waveform for the word ‘THINK’.
a) 514172520
b) 202517415
c) 541172520
d) None of the mentioned

Explanation: “THINK”
ASCII value: T-001010; H-000100; I-100100; N-011100; K-110100
32-ary symbols(split into 5 bits): 5 1 4 17 25 20.

8. Find the 8-ary waveform for the word ‘HAPPY’.
a) 4040020246
b) 0440020246
c) 6420200440
d) None of the mentioned

Explanation: “HAPPY”
ASCII value: H-000100; A-100000; P-000010; P-000010; Y-100110
8-ary symbols: 0 4 4 0 0 2 0 2 4 6.

9. Find the 32-ary waveform for the word ‘HAPPY’.
a) 280856
b) 658082
c) 288056
d) None of the mentioned

Explanation: “HAPPY”
ASCII value: H-000100; A-100000; P-000010; P-000010; Y-100110
32-ary symbols: 2 8 0 8 5 6.

10. What are the characteristics of an ideal transmission line?
a) Different amplitude
b) No distortion
c) Time delay
d) All of the mentioned

Explanation: The output from the ideal transmission line has some time delay different amplitude but it should not have distortion it should have the same shape as the input.

11. The point at which the output signal power has fallen to 0.707 of its peak value is called as _____
a) 3db point
b) Half power point
c) 3db & Half power point
d) None of the mentioned

Explanation: The frequency at which the output signal power falls to half the peak value is called as half power point or 3db point.

12. The ratio of the filter bandwidth at -60db and -6db amplitude response point is called as _____
a) Half point factor
b) Normalized factor
c) Shape factor
d) None of the mentioned

Explanation: Shape factor is a measure of how well realizable filter approximates to ideal filter. It is the ratio of filter bandwidths -60db and -6db amplitude points.

13. As the order of the filter increases, the cost ______ and complexity ______
a) Increases, increases
b) Increases, decreases
c) Decreases, increases
d) Decreases, decreases

Explanation: According to the design of the filter as the order increases the complexity and cost of the filter also increases.

14. Which filter has maximum flatness?
a) Chebyshev filter
b) Butter-worth filter
c) High pass filter
d) Normalized filter

Explanation: Butter-worth filter as the best approximation to ideal filter and has the maximum flatness in the filter pass-band.

15. The measure of the width of the main lobe is called as ________
a) Null to null bandwidth
b) Half power bandwidth
c) Normalized bandwidth
d) Absolute bandwidth

Explanation: The main lobe consists of the maximum signal power. The measure of the width of the main lobe is called as null to null bandwidth.

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