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Mechanical Engineering :: Machine Design

Machine Design - Section 1
Machine Design - Section 2
Machine Design - Section 3
Machine Design - Section 4
Machine Design - Section 5
Machine Design - Section 6
Machine Design - Section 7
Machine Design - Section 8

  1. A shaft is subjected to a maximum bending stress of 80 N/mm2 and maximum shearing stress equal to 30 N/mm2 at a particular section. If the yield point in tension of the material is 280 N/mm2 and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

    2. A.

    2.5
    B.

    2.8
    C.

    3.0
    D.

    3.5

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  2. The longitudinal stress is __________ of the circumferential stress.

    3. A.

    one-half
    B.

    two-third
    C.

    three-fourth
    D.

    double

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  3. The expression 0.175 - 0.841/T is the Lewis form factor for

    4. A.

    \(14\frac { 1 } { 2 }^o\)composite and full depth involute system
    B.

    20° full depth involute system
    C.

    20° stub system
    D.

    none of the above

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  4. A screw will be self locking, if

    5. A.

    friction angle is less than helix angle
    B.

    friction angle is more than helix angle
    C.

    friction angle is equal to helix angle
    D.

    efficiency of screw is 100%

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  5. The maximum shear stress theory is used for

    6. A.

    brittle materials
    B.

    ductile materials
    C.

    plastic materials
    D.

    non-ferrous materials

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