2.1 Explain how electric current in the P-N junction (shown below) is form when forward biased.

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(3-) Draw the electrical equivalent circuits for DC shunt motor and DC serial motor carefully and as readable with the names of circuit elements written on the figures by writing the names of figures below them.

Explain the operation principle of differential relay

2. A 15 kW shunt machine having an Armature circuit Resistance of 0.35 Q and a filed resistance of 1002, generates a terminal voltage of 240 V at full load. Find the Efficiency When I. act as a Generator at full load . II. act as a Generator at half load III. act as a Motor

Qn 1. Explain the conditions and operation of Synchronous machine parallel operation with diagram

A 480V, 120KVA, 50HZ, 4-pole, Y-connected SG was tested to get VToc=500Vand Isc=180A at rated field current and Ide=50A at Vde=25V. If the machine is operating at rated conditions and PF=0.92 lagging. wwwm 1. Find Armature Resistance (RA) and Synchronous Reactance (X) 2. Calculate the armature current, and the internal induced voltage EA. 3. Find the full load Voltage Regulation.

Solve for ID (mA) in a JFET given the following:  IDSS=11.8mA VGS=-1.55V VGSoff=-4.9V

The preferred method for applying the field excitation voltage uses a field relay which operates on the principle of A. speed application. B. time application.C. angle application. D. thermal application.

Please answer the question below. Thank you so much!!