Principles of Communication (Midterm) Mocktest

29問 • 1年前

問題一覧

is an electronic signal made up of many random frequencies at many amplitudes added to a radio or information signal when transmitted from one place to another or as it is processed.

Noise

It disrupts a signal when unwanted signals are added.

Interference

it is unwanted interference that degrades a communication signal and affects both analog and digital signals,

Signal Noise

This comes from sources that cannot be controlled by humans, such as in industrial, atmospheric, or space.

External Noise

This comes from electronic components in a receiver, such as resistors, diodes, and transistors. It's only low-level but often great enough to interfere with weak signals.

Internal Noise

produced by manufacturing equipment like automotive ignition systems, generators, and electric motors.

Industrial Noise

electrical disturbances that happen naturally in the Earth’s atmosphere. This is also referred to as static, which usually comes from lightning.

Atmosphere Noise

in solar or cosmic, comes from space.

Extraterrestrial Noise

caused by thermal agitation, which is the random motion of free electrons in a conductor caused by heat.

Thermal Noise

comes from components such as diodes and transistors. Semiconductors produce three (3) types of noise, including shot noise, transit-time noise, and flicker noise.

Semiconductor Noise

The current flow in any device is not direct and linear, which sometimes makes the current carriers, such as electrons, take random paths from source to destination. It is this random movement that produces the _______?

Shot Noise

a ______ noise is created when the transit time of the signal frequency is the same as the time a current carrier takes to traverse from sender to receiver.

Transit-time Noise

A _____or excess noise comes from minute random variations of resistance in the semiconductor comes from generating new signals and harmonics caused by circuit nonlinearities since a circuit is never perfectly linear.

Flicker Noise

it is a condition that adds unwanted change in the signal.

Distortion

is the communication receiver’s ability to identify and select a desired signal from others present in the frequency spectrum.

Selectivity

is used to express the steepness of the skirts.

Shape factor

or skirt selectivity, are the sides of a tuned circuit response curve.

Skirts

A method of expressing the sensitivity of a receiver is by obtaining the MDS. What MDS mean?

minimum discernible signal

The MDS It is the input signal level that is almost equal to the average _________ of the receiver

noise floor

are assigned to many types of signals that can be used to interpret a detected signal easily.

Radio emission code designations

Thermal agitation is also referred to as white noise was discovered by who?

John Bertrand Johnson

A filtered or band-limited noise, however, is called _____?

pink noise

Which Statement is TRUE about Industrial Noise

Gas-filled lights, such as fluorescent lights, are also sources of industrial noise.

Which Statement is FALSE about Thermal Noise

produces three (3) types of noise, including shot noise, transit-time noise, and flicker noise.

Which Statement is TRUE about Semiconductor Noise

comes from components such as diodes and transistors. Semiconductors produce three (3) types of noise, including shot noise, transit-time noise, and flicker noise.

comes from generating new signals and harmonics caused by circuit nonlinearities since a circuit is never perfectly linear. This also occurs when two (2) or more signals are used in a non-linear circuit

Intermodulation Distortion

In television, noise can be observed as

snow

In television and on black-and-white TVs, noise can be observed as

snow

In on a colored screen, noise can be observed as

confetti

The Contemporary World Mock test (Prelims)

Xai Alexandrei Delos Reyes · 58問 · 2年前

The Contemporary World Mock test (Prelims)