# UGCNET-Dec2013-III: 48

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____ is a type of transmission impairment in which the signal looses strength due to the resistance of the transmission medium

1. Attenuation
2. Distortion
3. Noise
4. Decibel

1 vote

Ans is A attenuation

Attenuation is a general term that refers to any reduction in the strength of a signal.Attenuation occurs with any type of signal, whether digital or analog. Sometimes called loss, attenuation is a natural consequence of signal transmission over long distances

Distortion, in acoustics and electronics, any change in a signal that alters the basic waveform or the relationship between various frequency components; it is usually a degradation of the signal. Straight amplification or attenuation without alteration of the waveform is not usually considered to be distortion.

Noise is unwanted electrical or electromagnetic energy that degrades the quality of signals and data.  Noise occurs in digital and analog systems, and can affect files and communications of all types, including text, programs, images, audio, and telemetry.

The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, often power or intensity. One of these values is often a standard reference value, in which case the decibel is used to express the level of the other value relative to this reference

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