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Mechanical Engineering :: Machine Design

  1. The bolts of smaller diameter than M16 are not permitted in making fluid tight joints.

  2. A.

    Correct

    B.

    Incorrect

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  3. A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt, is the tensile stress for the shell material, then thickness of shell is equal to

  4. A.

    \(\frac { pd } { \sigma_t }\)

    B.

    \(\frac { pd } {2 \sigma_t }\)

    C.

    \(\frac { pd } { 3 \sigma_t }\)

    D.

    \(\frac { pd } { 4\sigma_t }\)

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  5. A quarter turn belt drive is used when the shafts are arranged at right angles and rotate in one definite direction.

  6. A.

    Yes

    B.

    No

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  7. According to Indian standard specifications, a plain carbon steel designated by 40C8 contains carbon

  8. A.

    0.20 to 0.40%

    B.

    0.35 to 0.45%

    C.

    0.40 to 0.60%

    D.

    none of these

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  9. The machine screws are

  10. A.

    slotted for a screw driver and are generally used with a nut

    B.

    similar to tap bolts except that they are of small size and a variety of shapes of heads are available

    C.

    used to prevent relative motion between the two parts

    D.

    none of the above

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