Design of Machine Elements - 1 - Mechanical Engineering (MCQ) questions and answers for Q. 10335

Q.  The efficiency of power screw can be improved if ______
- Published on 14 Sep 15

a. the rolling friction is replaced by sliding friction in the screw threads
b. the sliding friction is replaced by rolling friction in the screw threads
c. both a. and b.
d. none of the above

ANSWER: the sliding friction is replaced by rolling friction in the screw threads

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    Discussion

  • Sravanthi   -Posted on 04 Nov 15
    - The efficiency of power screw can be improved by replacing sliding friction by rolling friction.

    - Recirculating ball screws have rolling friction. It consists of screw, nut and steel balls. In these screws, there is no direct contact between screw and the nut threads and achieve contact through the steel balls.

    - The rotary motion can be converted into linear motion, as they have low coefficient of friction.

    - These screws are used in NC-CNC machine tools and in automobile steering gears.

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