1) . A factory loadconsists of the following :
(i) an induction motorof 150 h.p. (111·9 kW) with 0·7 p.f. lagging and 80% efficiency;
(ii) a synchronousmotor of 100 h.p. (74·6 kW) with 0·85 p.f. leading at 90%efficiency
(iii) a lighting loadof 50 kW.
Find the annualelectric charges if the tariff is Rs 100 per annum per kVA maximumdemand plus 7 paise per kWh ; assuming the load to be steadythroughout the year.
ANS[Rs 1,96,070]
2) . A hydro-electricplant has a catchment are of 120 square km. The available run offis 50% with annual rainfall of 100 cm. A head of 250 m is availableon the average. Efficiency of the power plant is 70%. Find (i)average power produced (ii) capacity of the power plant. Assume aload factor of 0.6.
ANS [(i) 3266 kW (ii)5443 kW]
