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Mechanical Engineering :: Machine Design

  1. The Wahl's stress factor (K) for springs is given by
    (where \(C = Spring index = \frac { Mean dia. of spring (D) } { dia. of wire (d)}\)

  2. A.

    \(\frac { 2C + 1 } { 2C- 1} + \frac {0.615}{C}\)

    B.

    \(\frac { 2C - 1 } { 2C + 1} + \frac {0.615}{C}\)

    C.

    \(\frac { 4C + 1 } { 4C- 4} + \frac {0.615}{C}\)

    D.

    \(\frac { 4C - 1 } { 4C - 4} + \frac {0.615}{C}\)

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  3. According to Rankine's theory, the failure occurs at a point in a member

  4. A.

    when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in a simple tension test

    B.

    when the maximum principal stress in a bi-axial stress system reaches the elastic limit of the material in a simple tension test

    C.

    when the strain energy per unit volume in a bi-axial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test

    D.

    when the maximum principal strain in a bi-axial stress system reaches the strain at the elastic limit as determined from a simple tension test

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  5. The dedendum is the radial distance from the

  6. A.

    pitch circle to the top of a tooth

    B.

    pitch circle to the bottom of a tooth

    C.

    top of a tooth to the bottom of a tooth

    D.

    addendum circle to the clearance circle

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  7. In a steam engine, the valve rod is connected to an eccentric rod by means of

  8. A.

    cotter joint

    B.

    knuckle joint

    C.

    universal joint

    D.

    flange coupling

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  9. In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

  10. A.

    normal pitch

    B.

    axial pitch

    C.

    diametral pitch

    D.

    module

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