On a thin-walled tank, internally pressurized cylinders p with wall thickness t and average radius r, two strain gauges are installed according to the figure in such a way that longitudinal strain gauge (1) and peripheral strain gauge (2) are installed on the tank. Are. Strain gauges are both similar to the Gage factor G and have an electrical resistance of Ro at zero strain. The modulus of elasticity of the tank is E and its Poisson's ratio is 9. Two strain gauges are mounted on two branches of one Watson bridge and two resistors R3 and R4 with similar resistance and constant R on the other two branches of the bridge (as shown in Figure 3). Longitudinal (o,) and peripheral stresses (o9) in a reservoir can be calculated from the following equations: pr 2t pr t It is desirable to calculate the relationship between the internal pressure of the tank p and the output voltage of the Watson bridge vo. 2 Ve R3 RA Figure 1: Thin-walled cylindrical tank under internal pressure p and

A Cockcroft-Walton type voltage multiplier has ten stages with capacitances, all equal to 0.1 μF. The supply transformer secondary voltage is 100 kV at a frequency of 60 Hz. If the load current to be supplied is 5 mA, find (a) the percentage ripple, (b) the regulation, and (c) the optimum number of stages for minimum regulation or voltage drop.

The electric field profile in the depletion region of a p-n junction in equilibrium is shown in the figure. Which one of the following statement is not true? E (V/cm) X (4em) -0.1 Both n-type and p-type depletion regions are uniformly doped. The potential difference across the depletion region is 700 mV. Left side of the junction in n-type and right side is p-type.

Three phase Bridge rectifier operated from a 380V, 50Hz source throughout three-phase Y/Y connected transformer with ration 2:1. The load current has continuous character with negligible ripples and average thyristor current of 15A. The circuit inductance per phase is 1.2mH. The rectified voltage due to overlapping angle is 90 % of that voltage when this angle is neglected. 1- How much will the voltage drop be due to circuit inductance * 2- How much will the dc average voltage Vdc(alpha) be. 3- How much will the firing angle be ? 4- The overlapping angle. 5- How much is the percentage change of the output dc power if the thyristors T2, T4 and T6 are replaced by three diodes D2, D4, D6. 6- How much will be the maximum RMS phase current for the mentioned in previous task circuit ( semi-converter). 7- If an additional of 1 mH inductances are added to the existing inductances in the phases , how much will the overlapping angle be. The dc load current is kept constant & the…