Multiple choice

A load cell consists of a solid cylinder(steel) of 30 mm diameter with four strain gauges bonded to it in Poisson’s arrangement and connected into the four arms of a wheatstone bridge. The gauges are 200 ohm each with a gauge factor of 2.0. Determine the sensitivity of the load cell when load applied to the cell is 2000kg and voltage applied to the bridge is 12 V, the modulus of elasticity of steel is 200 GN/m2 and Poisson’s ratio = 0.295.

  1. 9.16 x 10-6

  2. 10

  3. 9.16 x 106

  4. 8.23 x 106
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A Correct answer
Explanation

Sensitivity of the load cell per kN of applied load to the cell and per volt of voltage applied to the bridge = Vo/(F in newtons x V) = (2.157 X 10-3)/((2000 X 9.81)/1000 ) x 12 = 9.16 x 10-6 

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