Q.Which of the following units is correct to measure attenuation? (A) decibel
(B) ohm
(C) ampere
(D) volt

Noise is picked up predominantly during transit through the communication channel, so the transmission medium is where it most affects the signal.

In a communication system, noise refers to unwanted signals that tend to interfere with the desired signal and corrupt its information content. While every stage can contribute some noise, the signal is most vulnerable while it propagates through the transmission medium/channel (e.g. atmospheric interference, thermal noise in …

Attenuation is expressed in decibels → option (B).

Attenuation is the loss of strength (power) of a signal as it travels through a communication channel. Because signal power ratios span a very wide range, attenuation is measured on a logarithmic scale in **de …

A transducer converts one form of energy into another; an amplifier merely increases the amplitude/strength of an existing electrical signal using an external power supply, so it is not a transducer.

A transducer is any device that converts energy from one form into another, typically converting a non-electrical signal into an electrical one or vice versa:

• Microphone: converts sound (acoustic) energy into an electrical signal — a transducer.
• Loudspeaker: converts an electrical signal back into sound (acoustic) energy — a transducer. …

Noise is unwanted, random disturbance that mainly corrupts a signal while it travels through the transmission channel, since that is where it is most exposed to external interference over the longest stretch.

Why: At the transmitter, the signal is generated in a controlled environment with minimal external interference. At the destination/receiver, filtering and signal-conditioning can reduce noise impact. But while the signal travels through the transmission medium (cable, free space, etc.) over long distances, it is continuously exposed to ex …

Attenuation is measured in decibels (dB).

Attenuation is the loss of strength of a signal as it propagates through a channel (cable, fibre or free space). Because it is a ratio of powers expressed on a logarithmic scale, it is measured in decibels: …

Transducers are the interface between the "real world" signal (sound, light, etc.) and the electrical signal that a communication system actually transmits/receives.

In any communication system, the message to be conveyed (e.g. speech, music, a picture) usually originates as, and is finally perceived as, a non-electrical form of energy. However, electronic communication systems (transmitters, amplifiers, modulators, channels, receivers) work with electrical signals.

A transducer is a device that converts energy from one form into another. In a communication system it performs two complementary jobs:

• At the transmitter, an input transducer (e.g. a microphone) converts the non-electrical message signal (sound pressure variations) into a corresponding electrical (analog or digital) signal, which can then be amplified, modulated onto a carrier, and transmitted. …

A transducer converts one form of energy (e.g. sound, light, pressure) into another (typically electrical) form.

A transducer is a device that converts energy from one form into another — most commonly, in communication and instrumentation systems, converting a non-electrical form of energy (sound, light, heat, pressure, etc.) into an electrical signal, or vice versa (e.g. a microphone converts sound energy to electrical energy; a loudspeaker converts electrical energy back to sound). This is distinct from an amplifier (which boos …