EE 702 · Chapter 6
Utilization of Electrical Energy past question
6.4 Causes and Disadvantages of Low Power Factor and Different Techniques to Improve Power Factor
A 35 kW induction motor has pf 0.9 and efficiency 0.9 at full load, pf 0.6 and efficiency 0.7 at half load. At no load, the current is 25% of full load current and pf 0.1. Capacitors are supplied to make the line pf 0.8 at half load. With these capacitors in circuit, find the line pf at (i) full load (ii) no load.