Two alternators are operating in parallel supplying a common load of 4250 kW at 0.85 power factor lag. Alternator A contributes 600 kVAR at 0.92 power factor lag. Solve for the power factor of alternator B.

A Synchronous Motor taking 40kW is working in parallel with a load of 80kW having a power factor of 0.75 lagging. The power factor of the combined load os 0.9 lagging. Find the power factor and the reactive KVA of the motor

A three-phase alternator generating unbalanced voltages is connected to an unbalanced load through a 3-phase transmission line as shown in figure. The neutral of the alternator and the star point of the load are solidly grounded. The phase voltages of the alternator are Ea = 1020º, Eb = 102-90°, Ec = 10/120⁰ E E E The positive sequence component of the load current is (A) 1.3102-107⁰ A (B) 0.3322-120° A (C) 0.9962-120º A (D) 3.5104-81⁰ A +) + j1.002 0000 j1.002 0000 j1.0Ω vovo j1.0Ω 0000 j2.002 voor j3.002 oooo

The e.m.f. 's from four generators are e = 4 7sin@t e = 2 cos ot, e =/7 cos(@t + 90° ) and 1 3 = 5/2 sin(ot – 90° ). The alternators are connected in series. e4 18. Find the rms value of the resultant e.m.f A 5.0 В 4.0 C 2.5 D None of the above. 19. If the resultant e mf is expressed in the form e = Asin(ot + B). Find Bin degrees. A 53.1 в 369 С -53.1 D -36.9

14- A load 100+j0 ohms is connected across a 200V and 50 Hz supply. Find the Power factor. a. Unity b. 0.4 c. 0.8 d. 0.6

Problem 1 • A sinusoidal source with frequency of 60 Hz and rms-voltage of 100 V is connected to an RL load of 10 ohms and 100 uH. Find Power Factor From Calculation Find Power Factor From Plot L=10mH find power factor from calculation only

Suppose you have a three-phase generator that provides 120 Vac per phase and works at a frequency of 60 Hz, this generator can be connected in both delta and star. Also consider the following 6 load impedances, which will be connected at the same time to the generator as follows: ZA, ZB and Zc are connected in star, while Zp, Zg and Zp are connected in delta. j20 j3n Za j20 ZA j30 j3n -j20 j 30 -j20 Zo -j20 ZE j30 -j2n j 3n. ZF Assume the generator is star-connected with neutral, calculate total system power, total power factor, and current in neutral.

Solve 9

2. Three series loads are drawing 20A ms current through a 60HZ source. Load 1 is an 400W, 0.8 lagging induction motor. Load 2 is a 500VA, 0.6 lagging power factor and load 3 is a 2 ohm incandescent bulb. a) What is the total VA of the combined load? b) What is the overall PF of the combined load? c) What RMS voltage is the combined load operating? d) What capacitor VAR must be installed in parallel to the combine load to improve its overall PF to unity? e) What is its approximate capacitance in microfarad?