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Engineering Mathematics, Volume 2 by E. Rukmangadachari

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Chapter 10 Partial Differential Equations

  1. The partial differential equation obtained by eliminating a and b from (xa)2 + (yb)2 = zz cot2 α is
    1. p2q2 = tan2 α
    2. p2 + q2 = tan2 α
    3. p2 + q2 = cot2α
    4. p2q2 = tanα

    Ans: (b)

  2. The partial differential equation obtained by eliminating a and b from x2 + y2 + (za)2 = b2 is
    1. py = qx
    2. py + qx = 0
    3. px = qy
    4. px + qy = 0

    Ans: (a)

  3. The partial differential equation obtained by eliminating a and b from image
    1. image
    2. py = qx
    3. px + qy = 0

    Ans: (c)

  4. The partial differential equation obtained by eliminating the arbitrary function ...

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