Digital Communication Questions and Answers
Q1.
The substitution of the letters are done
Answer :
Parallel way
Q2.
Public key cryptosystem uses same key for both encryption and decryption.
Answer :
False
Q3.
In public key cryptosystem which is kept as public?
Answer :
Encryption keys
Q4.
Which are called the block ciphers?
Answer :
1. IDEA
2. CAST
3. Triple-DES
Q5.
A set of numbers is called as super increasing if
Answer :
Each element greater than sum of all the previous elements
Q6.
How can frequency selective distortion be minimized?
Answer :
1. By using pilot signal
2. By adaptive equalization
3. By spread spectrum
Q7.
The inter-leaver is more effective if the vehicle is
Answer :
Fast
Q8.
Which needs more signal power?
Answer :
16-QAM
Q9.
What are the parameters calculated for an estimator?
Answer :
1. Error
2. Mean square error
3. Variance
Q10.
Diversity technique
Answer :
Provides significant link improvement
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