(d) A 240 kW, 500 V, 1800 r/min DC generator has an overall efficiency of 94% and the laʼR losses in the armature is 0.0

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D A 240 Kw 500 V 1800 R Min Dc Generator Has An Overall Efficiency Of 94 And The Lar Losses In The Armature Is 0 0 1 (63.58 KiB) Viewed 40 times

(d) A 240 kW, 500 V, 1800 r/min DC generator has an overall efficiency of 94% and the laʼR losses in the armature is 0.025 pu. The shunt field resistance is 60 12 and the rated current, If is 5A. (i) Calculate the rated armature current. [3 marks] (ii) Calculate the total losses in the machine. [3 marks] (iii) Estimate the torque needed to drive the generator at 1800 r/min, considering the shunt field is powered by a separate source, Pin=253 819.5 W and the speed is 183.5 rad/s? [4 marks] ] (iv) Given that the no-load weight of the generator is 1200 kg and the on-load weight of the generator is 2100 kg, evaluate and justify the suitable weight to be considered towards getting the output power to weight ratio of the generator as the final result and propose the suitable excitation for this DC generator. [3 marks]