Numerical - Overall efficiency of power screw, given torque & load

Q.  Calculate overall efficiency of power screw, if the torque applied by the operator is 150 x 103 to move a load of 30 kN through a distance of 10 mm
- Published on 14 Sep 15

a. 22.36 %
b. 37.69 %
c. 31.83 %
d. 30.23 %

ANSWER: 31.83 %

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    Discussion

  • Sravanthi   -Posted on 04 Nov 15
    Power screw: It is a drive used to convert rotary motion into linear motion for the purpose of power transmission.

    Given: Torque (T) = 150 x 103 N-mm, load (W) = 30 kN, distance (l ) = 10 mm

    Formula: η = Wl / (2 π T)

    here, W =load, T = torque, l is the distance moved by the load

    Solution:

    Substituting the given values we get,

    η = Wl / (2 π T)

    η = 30 x 103 x 10 / (2 x π x 150 x 103 )

    η = 0.3183

    η = 31.83%

    Overall efficiency of power screw is 31.83%

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