Question 51 : The auto-correlation function is _________
1. impulse function
2. linear function
3. odd function
4. even function
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Question 52 : What is the auto-correlation function of a signal (t) at t₀=0?
1. It is equal to average voltage of the signal
2. It is equal to average power of the signal
3. It is equal to zero
4. It is equal to infinite
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Question 53 : Which of the following statement is not true about auto-correlation function?
1. it is non-unique description of goals
2. it is measure of both time variation and statistical dependence
3. it is an average function
4. it is defined only for periodic signals
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Question 54 : Relationship between amplitude and frequency is represented by ________
1. Time-domain plot
2. Phase-domain plot
3. Frequency-domain plot
4. Amplitude-domain plot
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Question 55 : Auto-correlation function is non-unique description of signals.
1. True
2. False
3.
4.
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Question 56 : What is the advantage of superheterodyning?
1. High selectivity and sensitivity
2. Low Bandwidth
3. Low adjacent channel rejection
4. Low fidelity
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Question 57 : An ergodic process is present in communication, if many random signals have ________
1. identical time averages
2. identical ensemble averages
3. identical time and ensemble averages
4. identical bandwidth
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Question 58 : Why amplitude modulation is issued for broadcasting?
1. It is more immune to noise
2. It has more fidelity
3. It avoids receiver complexity
4. It has better selectivity and sensitivity
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Question 59 : Which of the following statement is incorrect about modulation?
1. It is used to allow the use of practical antennas
2. It is used to separate different transmissions
3. It is used to reduce the required bandwidth
4. It is used to ensure that the message is transmitted over long distances
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Question 60 : Modulation is used to allow the use of practical antennas.
1. True
2. False
3.
4.
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