he power of a signal at input to a 200-meter communication cable is 15 milliwatts. The attenuation of the communication medium is -0.5 dB/meter. The output signal of the cable is fed to an amplifier that increases the power of signal by a factor of 1000. a) What is the power of the signal in milliwatts at the output of the amplifier? b) Suppose we measure a total noise power of 60 nanowatts at the output of the amplifier. What is the SNR(dB) for the signal at this point

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Power Amplifier

The power amplifier is an electronic amplifier designed to maximize the signal strength of a given input. The input signal strength is enhanced to a high enough level to drive output devices such as speakers, headphones, RF (Radio frequency) transmitters, etc. Unlike voltage / current amplifiers, the power amplifier is designed to drive core loads directly and is used as a storage block in the amplifier series.

Maximum Efficiency Criterion

In every field of engineering, there is a tremendous use of the machine and all those machines are equipped for their popular work efficiency so it very much important for operation engineers to monitor the efficiency of the machine, planning engineers to check out the efficiency of the machine before installing the machine and design engineers to design machine for higher efficiency than and then the utility will procure their products that will ultimately lead to profit and loss of the company. It indicates the importance of efficiency right from the initial stage as manufacturing units, intermediate stage as planning coordinators, and end-users stage as a utility.