Digital Communication Questions and Answers, Set 76

Digital Communication Questions and Answers

Q1. 

Chip is defined as

Answer :   

Shortest uninterrupted waveform

Q2. 

Which system allows larger processing gain?

Answer :   

Frequency hopping

Q3. 

Slow frequency hopping is

Answer :  

Several modulations per hop

Q4. 

The shift register needs to be controlled by clock pulses.

Answer :   

True

Q5. 

For any cyclic shift, the auto-correlation function is equal to

Answer :   

-1/p

Q6. 

The system should have

Answer :  

Larger (J/S)reqd & Greater system’s noise rejection capability

Q7. 

Pretty good privacy (PGP) security system uses

Answer :  

Public & Private key cryptosystem

Q8. 

Which block cipher has key length of 128 bits?

Answer :   

1. IDEA

2. CAST

3. IDEA & CAST

Q9. 

Which algorithm is used for public key encryption?

Answer :   

RSA & Diffie-Hellman

Q10. 

DSA protocol is based on

Answer :   

Discrete logarithm problem

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