One of the following is not a useful quantity for comparing

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One of the following is not a useful quantity for comparing the noise performance of receivers—

1. Input noise voltage
2. Equivalent noise resistance
3. Noise temperature
4. Noise figure

Correct Option: A

(A) For comparing the noise performance of receivers, the useful quantities are:
● Equivalent noise resistance
● Noise temperature
● Noise figure
Hence alternative (A) is the correct choice.