Question 11 : The detector that minimizes the error probability is called as
1. Maximum likelihood detector
2. Minimum likelihood detector
3. Maximum & Minimum likelihood detector
4. None of the mentioned
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Question 12 : Roll off factor is the fraction of
1. Excess bandwidth and absolute bandwidth
2. Excess bandwidth and minimum nyquist bandwidth
3. Absolute bandwidth and minimum nyquist bandwidth
4. None of the mentioned
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Question 13 : An error in binary decision making occurs when the channel noise is
1. Greater than the optimum threshold level
2. Lesser than the optimum threshold level
3. Greater or Lesser than the optimum threshold level
4. None of the mentioned
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Question 14 : The sample from the demodulation process consists of sample which is _______ to energy of the received symbol and _____ to noise.
1. Directly and inversely proportional
2. Inversely and directly proportional
3. Both directly proportional
4. Both inversely proportional
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Question 15 : The disadvantage of preset equalizer is that
1. It doesnot requires initial training pulse
2. Time varying channel degrades the performance of the system
3. All of the mentioned
4. None of the mentioned
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Question 16 : A Gaussian distribution into the non linear envelope detector yields
1. Rayleigh distribution
2. Normal distribution
3. Poisson distribution
4. Binary distribution
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Question 17 : The causes for error performance degradation in communication systems are
1. Interference
2. Electrical noise
3. Effect of filtering
4. All of the mentioned
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Question 18 : Range of time difference of the zero crossing gives the value of
1. Width
2. Distortion
3. Timing jitter
4. Noise margin
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Question 19 : Equalization process includes
1. Maximum likelihood sequence estimation
2. Equalization with filters
3. Maximum likelihood sequence estimation & Equalization with filters
4. None of the mentioned
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Question 20 : What is symbol rate packing?
1. Maximum possible symbol transmission rate
2. Maximum possible symbol receiving rate
3. Maximum bandwidth
4. Maximum ISI value allowed
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