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  1. For the gear train,

    If θ1 = 2 rad. clockwise and the torque of gear 1 is 10 lb-ft, what is the displacement and torque of gear 7.

    2. A.
    rad CW, 7.5 lb-ft
    B.
    4 rad CW, 5 lb-ft
    C.
    rad CW, 7.5 lb-ft
    D.
    rad CW, 7.5 lb-ft

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    Answer : Option B

    Explanation :

    Number of teeths on any gear is proportional to its radius,

    i.e.

    and also displacement on all gear must be same

    => r1θ1 = r7θ7

    =>

    =>

    ∴

    ∴ rad CW

    Now, work done by one gear is equal to other,

    ∴ T1θ1 = T7θ7

    => .

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