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  3. 1) . a factory load consists of the following : (i

1) . A factory load consists of the following : (i) an induction motor of 150 h.p. (111·9...

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Electrical Engineering

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]

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