Question

1. In the figure below, what is the correct equation to find the value of capacitor C to be connected in parallel with the source Vg to improve the power factor angle of the circuits from oto 02. (2 Marks) the - 230 v.co 10 a.) c= P(tano, - tano,) c) c= P(tand, -tano,) wV av b.) c="(tano, -tane) d) c= P(tand,+ tano.) 2. The type of power which is actually consumed or utilized in an AC circuit is called: (2 Marks) a. Apparent Power b. Reactive Power c. Power Factor d. Real Power 3. In power triangle, the power factor is leading when the vaue of Qis: (2 Marks) a. Positive b. Negative c. Q is equal to P d. None of the above 4. In a 380/220V three phase 4 wire, balance Y-Y connected power system, with an impedance load of 1100 +j1100, which of the following is not correct. (2 Marks) a. None of the above b. The current Ib = 0.141 /-165 can be written as Ib = 0.141/+195 c. The current la = 0.141/-45 is equal to current Ib + current Ic wherein the current Ib = 0.1412-165 and current le = 0.141/+75 d. The summation of current la + b + c 0. 5. In a three phase ABC phase sequence power system. Which of the following is not correct. (2 Marks) a.) Va is leading Vb by 120 electrical degrees. b.) Vb is leading Va by 120 electrical degrees c.) Vc is lagging Va by 120 electrical degrees. d.) Vb lis lagging Ve by 120 electrical degrees

Answer 1

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