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engineering
electrical engineering
december 2019
10

Electrical Engineering Questions and Answers December 10, 2019

Expert-verified solutions to help you succeed

A 500kVA 11000/220 V 1-phase transformer is connected to a load at 220V and power factor of 0.8 lagging. The iron loss of the transformer is 500W and the circuit parameters of the transformer are given as follow: HV winding: winding resistance, R1 = 2.5 ohm ; leakage reactance, X1 = j1.5 ohm LV winding: winding resistance, R2 = 0.005 ohm; leakage

(a) What is meant by the clock-hour number of a three-phase transformer? Explain the symbol of three-phase transformer with Dy11 stands for. (b) Explain why Dy11 transformer cannot be operated in parallel with a Yd1 transformer. (c) Briefly explain why a three-phase induction motor does not develop any torque at synchronous speed?

VDD5V, RD24k2, kn (WL)1mAV, VIV. If the amplifier is biased to operate with an overdrive voltage Vov of 0.5V, find the coordinates of the bias point Q. Find the value of Ip and the incremental gain Av at the bias point.

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