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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. For a square key made of mild steel, the shear and crushing strength are related as

    2. A.

    shear strength is equal to crushing strength
    B.

    shear strength is greater than crushing strength
    C.

    shear strength is less than crushing strength
    D.

    none of the above

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  2. The velocity factor for precision metallic gears cut with high accuracy and operating at velocities upto 20 m/s is equal to

    3. A.

    \(\frac { 0.75 } { 0.75 + \sqrt{v} }\)
    B.

    \(\frac { 3 } { 3 + \sqrt{v} }\)
    C.

    \(\frac { 4.5 } { 4.5 + \sqrt{v} }\)
    D.

    \(\frac { 6 } { 6 + \sqrt{v} }\)

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  3. In a bolt, the plane of shear should be across the threaded portion of the shank.

    4. A.

    Correct
    B.

    Incorrect

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  4. When a metal or alloy is cold worked,

    5. A.

    its hardness and strength increases
    B.

    it is worked below recrystallisation temperature
    C.

    Both (A) and (B)
    D.

    None of these

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  5. A leaf spring in automobiles is used

    6. A.

    to apply forces
    B.

    to measure forces
    C.

    to absorb shocks
    D.

    to store strain energy

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