In a gas purge system of level of measurement the back pressure being measured i

In a gas purge system of level of measurement the back pressure being measured is equal to 65Kpa.
Question 1
In a gas purge system of level of measurement the back pressure being measured is equal to 65Kpa. If the gas purged through a liquid with a specific gravity of 0.92 calculate the depth of the liquid in the tank.
Question 2
A dead weight tester has piston of a diameter of 1.5 cm and mass of (including the weight table) of 450g. Calculate the additional mass needed to check a pressure gauge at 7.5 psi.
Question 3
A dual active strain gauge(one under tension and the other compression) which has a gauge factor of Z is connected in a bridge configuration the gauge is fixed to 10mm diameter round steel rod. The supply voltage to the bridge is 12 volts and the output bridge is connected to the operational amplifier that has feedback of 15 kilo ohms. The gauge has a nominal resistance of 100 ohms. Calculate the output from the amplifier if the bar subjected to the tensile load of 260 kg young modulus for the steel is 200 Gpa.
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