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Mechanical Engineering :: Machine Design

  1. The major diameter of a screw thread is also known as core or root diameter.

  2. A.

    Yes

    B.

    No


  3. The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

  4. A.

    1420 d

    B.

    1680 d

    C.

    2080 d

    D.

    2840 d


  5. The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

  6. A.

    plasticity

    B.

    elasticity

    C.

    ductility

    D.

    malleability


  7. The helix angle for single helical gears ranges from

  8. A.

    10° to 15°

    B.

    15° to 20°

    C.

    20° to 35°

    D.

    35° to 50°


  9. In order to withstand resistance to wear, the best profile of gear is

  10. A.

    \(14 \frac { 1 } { 2 }^o\)full depth involute tooth

    B.

    20° full depth involute tooth

    C.

    20° involute stub tooth

    D.

    \(14 \frac { 1 } { 2 }^o\) stub tooth