Question 71 : Spectral density express________
1. Average voltage
2. Average power in a waveform as a function of frequency
3. Average noise voltage
4. Average channel capacity
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Question 72 : For a periodic function, the spectral density and auto-correlation functions are ________
1. Laplace transform pair
2. Fourier transform pair
3. Gauss transform pair
4. Z-transform pair
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Question 73 : Colpitts oscillator is used in frequency modulation.
1. True
2. False
3.
4.
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Question 74 : Aspect ratio is the ratio of ________
1. width to height
2. height to width
3. power to width
4. width to power
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Question 75 : Which of the following statement is true about frequency modulation?
1. noise gets decrease if we decrease deviation
2. noise gets decrease if we increase deviation
3. noise gets decrease by maintaining deviation constant
4. noise relates parabolically to deviation
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