A 230 V three phase star connected alternator gives on open circuit, emf of 230 V, for a field current of 0.38 A. The sa

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A 230 V Three Phase Star Connected Alternator Gives On Open Circuit Emf Of 230 V For A Field Current Of 0 38 A The Sa 1 (38.89 KiB) Viewed 43 times

A 230 V three phase star connected alternator gives on open circuit, emf of 230 V, for a field current of 0.38 A. The same field current on short circuit causes an armature current of 12.5A. The armature resistance measured between two lines is 1.8 ohms. Find the regulation for the current of 10 amperes at 0.8 lagging power factor. (10 Points) O a 63.98% O b. 4.22% O c. 65.98% O d. -7.78% A full load current of 100 A requires an excitation current of 3 A when a single phase 1200 V alternator is short circuited by an ammeter of resistance, 0.01 ohms. On open circuit, the same excitation produces 350 V. The resistance of armature is 0.5 ohm. Calculate the regulation of the alternator at 0.8 p.f. leading (10 Points) O a. - 10.255% O b. 19.62% O c. 10.255% O d. - 13.2196