Digital Communication Questions and Answers
Q1.
In stream encryption, the key sequence repeats itself.
Answer :
False
Q2.
Public key cryptosystem is also known as
Answer :
One way function
Q3.
Pretty good privacy program is used for
Answer :
Electronic mails & File encryption
Q4.
Which algorithm can be used to sign a message?
Answer :
Public key algorithm
Q5.
Merkle hellman is a symmetric cryptosystem.
Answer :
False
Q6.
Fast fading can be minimized by
Answer :
Robust modulation, Coding and interleaving
Q7.
Which noise component plays a role in decision making?
Answer :
Relevant noise
Q8.
Symbol error probability can also be determined using upper bound.
Answer :
True
Q9.
Diversity technique is used for combating
Answer :
1. Fading
2. Error bursts
3. Co-channel interference
Q10.
Which signalling scheme is preferred for fading channel?
Answer :
Frequency & Phase based modulation
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