A very high-pressure gauge, using a manganin element is to measure a maximum pressure length is 3 cm. The pressure sensitivity of wire material is 25 108 Pa. The wire diameter is 25 μm, 10-11 ΩΩ. Pa, resistively 45 × 10-6 resistances of all arms being equal. If the supply voltage is 12 V, find the output voltage due to maximum pressure.

The wire forms one arm of a Wheatstone bridge, wi 11.6 A pressure tapping is taken from a measuring point by means of a tubing 50 cm long, 5m bore to a U-tube manometer using water as the working liquid. The tubes are of 10 mm bore T start with, the water level is 30 cm below the top of the tube. Taking viscosity of air as 1.78 10 kg/m-s, find the time constant of the system if a small change occurs in the pressure which is around atmospheric.

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