Page 256

CHAP. 10]

AC POWER

245

Fig. 10-25

Fig. 10-26 10.34

The parallel circuit in Fig. 10-27 has a total average power of 1500 W. information. Ans: S ¼ 1500 þ j2471 VA, pf ¼ 0:519 lagging

Obtain the total power-triangle

Fig. 10-27

10.35

Determine the average power in the 15- and 8- resistances in Fig. 10-28 if the total average power in the circuit is 2000 W. Ans: 723 W, 1277 W

Fig. 10-28

10.36

A three-branch parallel circuit, with Z1 ¼ 25 158 , Z2 ¼ 15 608 , and Z3 ¼ 15 908 , has an applied voltage V ¼ 339:4 308 V. Obtain the total apparent power and the overall power factor. Ans: 4291 VA, 0.966 lagging

10.37

Obtain the complete power triangle for the following parallel-connected loads: load #1, 5 kW, pf ¼ 0:80 lagging; load #2, 4 kVA, 2 kvar (capacitive); load #3, 6 kVA, pf ¼ 0:90 lagging. Ans: 14.535 kVA, pf ¼ 0:954 lagging

Mahmood_Nahvi_eBook_Schaum_s_Outlines_Theory_An  
Mahmood_Nahvi_eBook_Schaum_s_Outlines_Theory_An  
Advertisement