1. TUTORIAL PROBLEMS A 300 m ring distributor has loads as shown in Fig. 13.45 where distances are in metres. The resis tance of each conductor is 0-2 W per 1000 metres and the loads are tapped off at points B, C and D as shown. If the distributor is fed at A at 240 V, find voltages at B, C and D. 240 V [VB=236-9 V; Vc=235-97 V; VD=237-45 V] 30 A E 10 A 50 A 70 70 D A 90 90 0 60 60 100 A B 230 V 80 80 Α B 20 A C 10 A Fig. 13.46 B 0.8 Ω 0.4 £2 A 2. 3. 70 A Fig. 13.45 A d.c. 2-wire ring main ABCDEA is fed from 230 V supply as shown in Fig. 13.46. The resistance of each section (go and re- turn) AB, BC, CD, DE and EA is 0-1 W. The loads are tapped off as shown. Find the voltage at each load point. [VB=227 V; Vc=225 V; VD=225 V; VE=226 V] In the d.c. network shown in Fig.13.47, A is the feeding point and is maintained at 250 V. The resistances 36 A 12 A 0.8 Ω Fig. 13.47 0.4 Ω 8 A C 16 A 0.4 Ω