Answer Happy

o X 9. Two impedances A and B are connected in parallel across a 120 V AC supply. The total current and the current in each impedance are adjusted to 20 A. The power drawn by A is doubled that of B and the power factor is lagging. Determine power factor of A. Module 4 TASK 1 5. A resistance R is connected in parallel with a variable inductive reactance XL. The combination is connected in series with impedance of 5 — 2 ohms. Solve for R, such so there is only one condition of resonance as XL as varied. a. 2 ohms b. 5 ohms c. 3 ohms d. 4 ohms 6. A coil whose resistance is 100 ohm and inductance of L1 is connected in parallel with a series combination of inductance L2 and capacitance C. When w = 1 x 105, the impedance of the whole combination is 300 ohms, purely resistive. When w = 2 x 105 no current flows towards the coil. Find the value of C. a. 38.23 nF b. 34.02 nF c. 35.36 nF d. 32.77 nF Task 3 4. A series circuit containing a 295 uF capacitor and a coil whose resistance and inductance are 3 ohms and 4.42 mH, respectively are supplied by the following series connected generators: 35 V at 60 Hz, 10 V at 180 Hz and 8 V at 240 Hz. Determine the power factor of the circuit. a. 0.486 b. 0.418 c. 0.465 d. 0.437 5. A capacitor of 3.18 microfarads is connected in parallel with a resistance of 2,000 ohms. The combination is further connected in series with an inductance of 795 mH and resistance of 100 ohms across a supply given by e = 400 sin wt + 80 sin (3wt + 60°). Assume w = 314 radians per sec. Determine the circuit power factor. a. 0.702 b. 0.650 c. 0.633 d. 0.612