Question 71 : The system which has insufficient information available to crypt-analyst is
1. One-time pad
2. Unconditionally secure
3. One-time pad & Unconditionally secure
4. None of the mentioned
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Question 72 : The shift register needs to be controlled by clock pulses.
1. True
2. False
3.
4.
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Question 73 : The conditions for perfect secrecy are
1. Only one key transforming message should exist
2. All keys should be equally likely
3. One key transforming message to each cipher text & all keys should be equally likely
4. None of the mentioned
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Question 74 : Bandwidth efficiency improvement involves
1. Dividing the geographical region into cells
2. Allowing frequency allocation
3. Dividing the geographical region into cells & Allowing frequency allocation
4. None of the mentioned
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Question 75 : Processing gain is given as
1. Wss/R
2. Rch/R
3. Wss/R & Rch/R
4. None of the mentioned
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Question 76 : The minimum spacing between consecutive hop positions gives the
1. Minimum number of chips necessary
2. Maximum number of chips necessary
3. Chip rate
4. None of the mentioned
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Question 77 : The system should have
1. Larger (J/S)reqd
2. Greater system's noise rejection capability
3. Larger (J/S)reqd & Greater system's noise rejection capability
4. None of the mentioned
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Question 78 : Caesar cipher was a mono alphabetic cipher.
1. True
2. False
3.
4.
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Question 79 : Uncertainty in the distance between transmitter and receiver translates into uncertainty in
1. Frequency
2. Propagation delay
3. Efficiency
4. None of the mentioned
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Question 80 : Acquisition can be of ______ type.
1. Coherent
2. Non coherent
3. Coherent & Non coherent
4. None of the mentioned
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