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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. The contact ratio is the ratio of

    2. A.

    length of path of contact to the circular pitch
    B.

    length of arc of contact to the circular pitch
    C.

    length of arc of approach to the circular pitch
    D.

    length of arc of recess to the circular pitch

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  2. The bearing characteristic number is given by (where p = Bearing pressure on the projected bearing area, Z = Absolute viscosity of the lubricant, and N = Speed of the journal)

    3. A.

    pZNpZN
    B.

    pNZ
    C.

    pZN
    D.

    ZNp

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  3. The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

    4. A.

    it is subjected to a higher stress than the outer side
    B.

    it is subjected to a higher cyclic loading than the outer side
    C.

    it is more stretched than the outer side during the manufacturing process
    D.

    it has a lower curvature than the outer side

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  4. In a marine flange coupling, the thickness of flange is taken as

    5. A.

    d/4
    B.

    d/3
    C.

    d/2
    D.

    3 d/4

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  5. The wire ropes make contact at

    6. A.

    bottom of groove of the pulley
    B.

    sides of groove of the pulley
    C.

    sides and bottom of groove of the pulley
    D.

    anywhere in the groove of the pulley

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