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Mechanical Engineering :: Machine Design

  1. The fatigue stress concentration factor is defined as

  2. A.

    the ratio of endurance limit with stress concentration to the endurance limit without stress concentration

    B.

    the ratio of endurance limit without stress concentration to the endurance limit with stress concentration

    C.

    the product of the endurance limits with and without stress concentration

    D.

    all of the above

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  3. A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, The junction radius is 60 mm and the junction pressure is 1.1 N/mm2. The maximum hoop stress developed in the inner cylinder is

  4. A.

    3.6 N/mm2 compression

    B.

    3.6 N/mm2 tension

    C.

    7.2 N/mm2 compression

    D.

    7.2 N/mm2 tension

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  5. A connecting rod subjected to an axial load may buckle in the plane of motion of the connecting rod.

  6. A.

    Correct

    B.

    Incorrect

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  7. In a turnbuckle, if one of the rods has left hand threads, then the other rod will have

  8. A.

    right hand threads

    B.

    left hand threads

    C.

    multiple threads

    D.

    pointed threads

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  9. When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

  10. A.

    have contact at the bottom most of the bearing

    B.

    move towards right of the bearing making metal to metal contact

    C.

    move towards right of the bearing making no metal to metal contact

    D.

    move towards left of the bearing making metal to metal contact

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