Digital Communication Questions and Answers
Q1.
The frequency hopping system uses ______ modulation scheme.
Answer :
MFSK
Q2.
Robustness gives the inability of a signal to withstand the impairments.
Answer :
False
Q3.
Pseudorandom signal ________ predicted.
Answer :
Can be
Q4.
The sequences produced by shift register depends on
Answer :
1. Number of stages
2. Feedback tap connections
3. Initial conditions
Q5.
Which are the design options for anti jam communicator?
Answer :
1. Time diversity
2. Frequency diversity
3. Special discrimination
Q6.
Which jamming method produces greater degradation?
Answer :
Partial jamming
Q7.
Data compression includes
Answer :
Removal of redundant character & Uniform distribution of characters
Q8.
Which operation is used in encryption using IDEA?
Answer :
Addition modulo 216 & Bit wise XOR
Q9.
In hash function output length is fixed.
Answer :
True
Q10.
For n input bits the number of substitution patterns are
Answer :
(2n)!
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