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Mechanical Engineering :: Machine Design

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Machine Design - Section 6
Machine Design - Section 7
Machine Design - Section 8

  1. Which of the following statement is correct regarding power screws?

    2. A.

    The efficiency of a self locking screw can not be more than 50%
    B.

    The efficiency of Acme (trapezoidal) thread is less than that of a square thread
    C.

    If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
    D.

    (A) and (B) Only

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  2. A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.

    3. A.

    smaller
    B.

    greater

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  3. A flange coupling is used to connect two shafts

    4. A.

    which are perfectly aligned
    B.

    which are not in exact alignment
    C.

    have lateral misalignment
    D.

    whose axes intersect at a small angle

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  4. The algebraic difference between the maximum limit and the basic size is called

    5. A.

    lower deviation
    B.

    upper deviation
    C.

    actual deviation
    D.

    mean deviation

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  5. When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire istensile stress

    6. A.

    tensile stress
    B.

    compressive stress
    C.

    shear stress
    D.

    bending stress

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