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  1. Which of the following are useful in comparing the noise performance of receivers?

    1. Input noise voltage
    2. Noise figure
    3. Noise resistance
    4. Noise temperature
    Select answer as per the following codes:

    2. A.
    1, 2 and 3
    B.
    1, 3 and 4
    C.
    2, 3, 4
    D.
    1, 2, 4

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    Answer : Option C

    Explanation :

    Noise figure, noise resistance and noise temperature are useful quantities. Input noise voltage alone is not sufficient unless gain of amplifier stages is also known.

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