A closed-loop system is used to track the sun to obtain maximum power from a photovoltaic array. The tracking system may be represented by a unity feedback control system and Ge(s) G (s) = 100 TS + 1 where tau = 3 s nominally. (a) Calculate the sensitivity of this system for a small change in tau. (b) Calculate the time constant of the closed-loop system response.

You are an electrician working on an overhead crane. The crane uses a large electromagnet to pick up large metal pipes. The magnet must have a minimum of 200 VDC to operate properly. The crane has an AC source of 240 V. You are given four diodes that have a peak voltage rating of 400 V each. These diodes are to be used to form a bridge rectifier to convert the AC voltage into DC voltage. Is the voltage rating of the diodes sufficient? To the nearest volt, what will be the DC output voltage of the bridge rectifier?

Calculate the equivalent resistances Rin of the following circuits. (The resistance value of the diodes in the conduction will be 0, the resistance value of the diodes in the insulation will be taken as infinity. R1=10ohm

The input to a full-wave rectifier is 10 V AC (RMS). The load resistor is 10 ohms and rectifier losses are 4W. The power efficiency of the rectifier is: O A. 58 % O B. None of the other choices are correct O C. 100 % O D. 80 % O E. 67 %