Digital Communication Questions and Answers, Set 80

Digital Communication Questions and Answers

Q1. 

The minimum spacing between consecutive hop positions gives the

Answer :   

Minimum number of chips necessary

Q2. 

Chips are the

Answer :   

Repeated symbols

Q3. 

The properties used for pseudorandom sequence are

Answer :   

1. Balance

2. Run

3. Correlation

Q4. 

For maximal length sequence, the sequence repetition clock pulses p is given by

Answer :   

2n + 1

Q5. 

The ratio (J/S)reqd gives the measure of

Answer :   

Invulnerability to interference

Q6. 

The jammer which monitors a communicator’s signal is known as

Answer :   

Frequency follower & Repeat back jammers

Q7. 

PGP offers _____ block ciphers for message encryption.

Answer :   

1. Triple-DES

2. CAST

3. IDEA

Q8.

What is the key size allowed in PGP?

Answer :   

1024-4096

Q9. 

The hash function

Answer :   

Is collision free

Q10. 

In transposition, the plaintext letters are

Answer :   

Rearranged

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