Noise in Communication Systems » Exercise – 1
15. Probability density function of thermal noise is :
(a) Poisson
(b) Binomial
(c) Gaussian
(d) None of the above
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Noise in Communication Systems » Exercise - 1 1. Probability density function of thermal noise is - (a) Binominal (b) Gaussian (c) Poisson (d) None of the above 2. Spectral density of white noise - (a) Varies with frequency (b) In constant (c) Varies with bandwidth (d) None of the above 3. Which system is free from noise ? (a) FM (b) AM (c) Both FM and AM (d) None of the above 4. The noise performance of a square law demodulator of AM signal is : (a) Poorer than that of an envelope detector (b) Better than that of a synchronous detector (c) Better than that of an envelope detector (d) Identical with that of a synchronous 5. The noise performance of wide band FM system : (a) Exhibits a threshold (b) Is independent of modulation index (c) Is generally poorer than that of an AM system (d) Is independent of signal-to-noise ratio 6. ……. Is the unit of loudness. (a) Decibel (b) Mel (c) Phon (d) Sone 7. ..... is the power ratio of one decibel. (a) 1.26 : 1 (b) 2 : 1 (c) 5 : 1 (d) 10 : 1 8. The ionosphere consists of ……. Layer. (a) Positive charge (b) Negative charge (c)…