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  1. A rectangular wave guide is designed to propagate at the dominant mode TE10 at a frequency of 5 GHz. The cut-off frequency is 0.8 of signal frequency. The ratio of the guide width to height is 2. The dimensions of the guide are

    2. A.
    3.75 cm, 1.875 cm
    B.
    4 cm, 2 cm
    C.
    8 cm, 4 cm
    D.
    2.54 cm, 1.27 cm

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    Answer : Option A

    Explanation :

    λc = 2a or

    ⇒ a = 3.75 cm

    Also,

    ∴ .

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