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  1. Four signals
    m1 = cos (ω0t), m2(t) = cos (ω0t), m3(t) = 2 cos (ω0t) and m4(t) = cos (4 ω0t) are multiplexed by Time Division Multiplexing system. The commutator speed in rps is

    2. A.
    2f0
    B.
    3f0
    C.
    4f0
    D.
    8f0

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    Answer : Option D

    Explanation :

    Apply Nyquist criteria.

    Maximum angular speed is 4ω0

    Thus commutator speed must be 2 x 4ω2 = 8ω0 .

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