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engineering
electrical engineering
january 2020
21

Electrical Engineering Questions and Answers January 21, 2020

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Cansider the amplifier shown in (Figure 1). Part A Find an expression for the output current i, Express your anawer In terme of aome or all of the varlables in. Ri. Re, and R. undo rdo reset keyboard shortouls help Reguest Ancwer Submit Part B What is the input impedance Express your anawer to three algnificant figures and Include the

A single phase induction motor requires a starting capacitor to generate startup torque. The size of this capacitor is determined by the amount of current that the startup winding requires. If a startup winding needs 5 Amps-RMS from a 120 V-RMS source to start the motor, determine the amount of capacitance needed. Assume that the resistance of the

A 500 MVA, 2 pole, turbo-alternator delivers 400 MW to a 50Hz system. If the generator circuit breaker is suddenly opened and the main steam valves take 400 ms to operate what will be the over-speed of the generator? The stored energy of the machine (generator and turbine) at synchronous speed is 4 kWs/ kVA.

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