Digital Communications Multiple Choice Questions on “Quantization”.
1. Spread spectrum is used for
A. Encrypting signal
B. Hiding signal
C. Encrypting & Hiding signal
D. None of the mentioned
Answer: C
Clarification: Spread spectrum is used for hiding and encrypting signals.
2. Which is a quantization process?
A. Rounding
B. Truncation
C. Rounding & Truncation
D. None of the mentioned
Answer: C
Clarification: Rounding and truncation are examples of quantization process.
3. Quantization is a _____ process.
A. Few to few mapping
B. Few to many mapping
C. Many to few mapping
D. Many to many mapping
Answer: C
Clarification: Quantization is a many to few mapping process.
4. Quantization is a _____ process.
A. Non linear
B. Reversible
C. Non linear & Reversible
D. None of the mentioned
Answer: A
Clarification: Quantization is a non linear and irreversible process.
5. Which conveys more information?
A. High probability event
B. Low probability event
C. High & Low probability event
D. None of the mentioned
Answer: B
Clarification: High probability event conveys less information than a low probability event.
6. If the channel is noiseless information conveyed is ___ and if it is useless channel information conveyed is ___
A. 0,0
B. 1,1
C. 0,1
D. 1,0
Answer: D
Clarification: If the channel is noiseless information conveyed is 1 and if it is useless channel information conveyed is 0.
7. The mutual information between a pair of events is
A. Positive
B. Negative
C. Zero
D. All of the mentioned
Answer: D
Clarification: The mutual information between a pair of events can be positive negative or zero.
8. The output of the source encoder is an analog signal.
A. True
B. False
Answer: B
Clarification: The output of the source encoder is a sequence of binary digits. The conversion of source output to digital form is done here in source encoder.
9. The output of an information source is
A. Random
B. Deterministic
C. Random & Deterministic
D. None of the mentioned
Answer: A
Clarification: The output of any information source is random.
10. When the base of the logarithm is e, the unit of measure of information is
A. Bits
B. Bytes
C. Nats
D. None of the mentioned
Answer: C
Clarification: The unit of measure of information is determined based on the base of logarithm. If the base is e then the unit is nats( natural unit).