A supply system feeds the following loads: i) a lighting load of 538 kW ii) a load of 438 kW at a p.f. of 0.707 lagging iii) a load of 838 kW at a p.f. of 0.8 leading iv) a load of 538 kW at a p.f. 0.6 lagging v) a synchronous motor driving a 538 kW DC generator and having an overall efficiency of 90%. For combined load, determine a) the power factor b) the total power c) the total kVA. Also calculate the power factor of synchronous motor so that the station power factor may become 0.90 (lagging) and the amount of KVA which the synchronous motor takes from the line? Make your comment on the effect of synchronous motor towards the value of system power factor. what is the all ans..???
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