- 914 5 Kw 13 Kv Elect Machines A M L E Sec B 1990 14 A 400 V 6 Pole 3 Phase 50 Hz Star Connected Synchrono 1 (14.08 KiB) Viewed 70 times
[914.5 kW, 13 kV] (Elect. Machines, A.M.L.E. Sec. B, 1990) 14. A 400-V, 6-pole, 3-phase, 50-Hz, star-connected synchronous motor has a resistance and synchro- nous reactance of 0.5 ohm per phase and 4-ohm per phase respectively. It takes a current of 15 A at unity power factor when operating with a certain field current. If the load torque is increased until the line current is 60 A, the field current remaining unchanged, find the gross torque developed, and the new power factor. [354 Nm; 0.93] (Elect. Engg. AMIETE Dec. 1990)