Electrical Engineering
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An electronic device dissipating 50 W is attached to the inner surface of an isothermal cubical container that is 120 mm on a side. The container is located in the much larger service bay of the space shuttle, which is evacuated and whose walls are at 150 K. If the outer surface of the container has an emissivity of 0.8 and the thermal resistance between the surface and determine the power generation in watts per unit of outer surface area.
See lessA simple electrical strain gauge of resistance 120Ω and having a gauge factor 2 is bond to steel having an elastic limit stress of 400MN/m 2 and modulus of elasticity is 200G N/m. Calculate the change in resistance. (a) Due to a change in stress equal to 1/10 of the elastic range; (b) Due to change of the temperature of 20 0 C if the material is advance alloy. The resistance temperature coefficient of advance alloy is 20X 10 -6 / 0 C.
See lessA resistance wire strain gauge with a gauge factor of 2 is hounded to a steel structure member is subjected to a stress of 120 MN/m2. The modulus of elasticity of steel is 200 GN/m2. Calculate the percentage change in the value of the gauge resistance due the applied stress.
See lessA strain gauge is bended to a beam which is 12 cm long and has a cross-sectional area of 3.8 cm2. The unstrained resistance and gauge factor of the strain gauge are 220 and 2.2 respectively. On the application of load the resistance of the gauge changes by 015 2. If the modulus of elasticity for steel is 207 GN/m2, calculate: (1) The change in length of the steel beam. The amount of force applied to the beam.
See lessA single strain gauge having resistance of 130 Ω is mounted on a steel cantilever beam at a distance of 0.12m from the free end. The beam dimensions are 25 cm (length) x 2.0 cm (width) x 0.3 cm (depth). An unknown force F applied at the free end produces a deflection of 11.8 mm at the free end. If the change in gauge resistance is found to be 0.145 Ω. Calculate the gauge factor. Take Young's modulus of steel as 200 GN/m².
See lessIn the resistance strain gauge arrangement of Fig. 4 . 7 2 strain gauge resistance R 1 = R 2 = R 3 = R 4 = 1 2 0 Ω E b = 9 V . If the output voltage of the bridge is 2 0 m V , find the value of force applied to the strip. Thickness t of the strip = 1 m m . Width b of strip = 1 0 m m . Young's modulus E of strip ma – terial = 8 × 1 0 1 0 N m 2 . Length L = 5 0 m m . Strain at root of cantilever = 6 P L E b t 2 . Assume output resistance as infinity. Gauge factor = 2 . 4 .
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