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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


  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.

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


  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


  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


  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