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Unformatted text preview: ME 365 Homework Set 11 Out November 17, 2011 Due December 1, 2011 Problem No. 1 The diagram of a typical bridge circuit is shown below: We know that the Thevenin-equivalent of any system is represented by the circuit diagram: (a) What is the Thevenin-equivalent voltage ( E th ) of the bridge? (b) Calculate the output impedance ( Z out ) of the bridge? (c) A secondary measurement device is to be connected across the output terminals of the bridge. Determine the relationship between Z in of the secondary device and Z out of the bridge that will ensure that loading is below 1%. Problem No. 2 (a) Explain why we need to use bridge circuits in conjunction with strain gages. (b) Explain the temperature effect on strain gages, and how to compensate for the temperature change within a bridge circuit. (c) Explain why in a bridge circuit with variable reactive impedance elements, one cannot use a DC supply voltage. ME 365 Homework Set 11 Out November 17, 2011 Due December 1, 2011 Problem No. 3 A cantilevered beam under a bending load is instrumented with one or more...
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- Fall '07