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51.	Small scale fading occurs due to(a) Doppler shift(b) Time delay(c) Doppler shift & Time delay(d) None of the mentionedI got this question during an online exam.The above asked question is from Mobile Radio Propagation in chapter Fading Channels of Digital Communications
Answer» The correct choice is (c) Doppler shift & TIME DELAY To explain: SMALL scale fading OCCURS due to time delay and frequency or Doppler shift.

52.	Small scale fading manifests due to(a) Signal dispersion(b) Time variant behavior(c) Signal dispersion & Time variant behavior(d) None of the mentionedThe question was posed to me by my college professor while I was bunking the class.My doubt is from Mobile Radio Propagation in portion Fading Channels of Digital Communications
Answer» CORRECT CHOICE is (C) Signal dispersion & Time variant behavior Explanation: SMALL scale fading manifests itself in TWO mechanisms- time spreading of the signal ( signal dispersion) and time variant behavior of the channel.

53.	Scintillation describes the fading caused by(a) Atmospheric changes(b) Physical changes(c) Thermal noise(d) Propagating effectsThis question was posed to me in an interview for job.This intriguing question originated from Mobile Radio Propagation in division Fading Channels of Digital Communications
Answer» Correct option is (b) PHYSICAL changes Explanation: Scintillation is used to describe fading CAUSED by physical changes in the PROPAGATING MEDIUM.

54.	Large scale fading refers the attenuation in(a) Amplitude(b) Phase(c) Signal power(d) None of the mentionedI got this question in unit test.This key question is from Mobile Radio Propagation in section Fading Channels of Digital Communications
Answer» Right answer is (c) Signal POWER Easiest EXPLANATION: large scale fading refers to signal power ATTENUATION or path LOSS due to motion in large area.

55.	The received power is attenuated by a factor called(a) Path loss(b) Free space loss(c) Path & Free space loss(d) None of the mentionedThe question was asked in an interview.I would like to ask this question from Mobile Radio Propagation in section Fading Channels of Digital Communications
Answer» The correct answer is (C) Path & Free SPACE LOSS Best EXPLANATION: The received POWER expressed in terms of transmitted power is attenuated by a factor called path loss or free space loss.

56.	What is the source for performance degradation?(a) Thermal noise(b) Man made noise(c) Natural noise(d) All of the mentionedI had been asked this question in homework.My doubt is from Mobile Radio Propagation topic in section Fading Channels of Digital Communications
Answer» Correct choice is (d) All of the mentioned Best explanation: The sources for PERFORMANCE DEGRADATION are thermal noise, NATURAL noise and MAN made noise.