Question 41 : The trithemius cipher is a mono alphabetical cipher.
1. True
2. False
3.
4.
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Question 42 : Which system allows larger processing gain?
1. Direct sequence
2. Frequency hopping
3. Direct sequence & Frequency hopping
4. None of the mentioned
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Question 43 : Pulse jammer consists of
1. Pulse modulated excess band noise
2. Pulse modulated band-limited noise
3. Pulse width modulated excess band noise
4. Pulse width modulated band-limited noise
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Question 44 : Spread spectrum makes ______ difficult.
1. Jamming
2. Interception
3. Jamming & Interception
4. None of the mentioned
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Question 45 : For hybrid systems the minimum required processing gain is
1. 5db
2. 10db
3. 17db
4. 25db
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Question 46 : Spread spectrum has immunity from
1. Noise
2. Multi-path distortion
3. Noise & Multi-path distortion
4. None of the mentioned
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Question 47 : In substitution technique encryption protection is more.
1. True
2. False
3.
4.
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Question 48 : If the initial pulse of 1000 is fed to shift register, after how many clock pulses does the sequence repeat?
1. 15
2. 16
3. 14
4. 17
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Question 49 : A cipher system is said to have perfect secrecy if
1. Posteriori probability is equal to priori probability
2. Posteriori probability is greater than priori probability
3. Posteriori probability is less than priori probability
4. None of the mentioned
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Question 50 : Which method is better?
1. To share same bandwidth
2. To share different bandwidth
3. To share same & different bandwidth
4. None of the mentioned
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