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1) In a 33 kv bus, the voltage is 1 pu in a base line to line voltage of 33 kv. If a LLL-G Fault occurs at this bus, the fault current flowing to the bus is 30KA. The 3phase base MVA is 100. what is the thevenin equivalent impedance seen looking from the fault to the the network.

2) AM Modulators Output is: Q(t) = 5cos(1800πt) + 20cos(2000πt) + 5cos(2200πt)
i) determine message signal m(t) and carrier signal c(t)
ii) modulation index
iii)ratio of sideband power to the carrier power

3) A three-phase 100 kVA, 480 V, 50 Hz, 4-pole, star-connected synchronous generator with a rated field current of 5 A was tested and the following data was taken. O/C voltage 500 V at rated field current of 5 A, S/C Test-Line current 200 A at rated field current of 5 A.
DC voltage of 10 V applied to two terminals, a current of 20 A was measured with no field currrent. Determine:
Ra=? , Xs=?, Draw the per phase equivalent circtuit per unit of the machine.

4) Op-Amp with feedback zener Diode

5) Nilsson Riedel 4.13 Problem of Superposition