1. for the given figures of ac motor stator connections, if we start the motor using Y-connection, then the line current will be a. 17.23A b. 51A c. 1.73A d. 10A
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Draw the circle diagram for 20 h.p. (14.92 kW), 440-V, 50-Hz, 3-ϕ induction motor from the following test figures (line values) : No-load : 440 V, 10A, p.f. 0.2 Short-circuit : 200 V, 50 A, p.f. 0.4 From the diagram, estimate (a) the line current and p.f. at full-load (b) the maximum power developed (c) the starting torque. Assume the rotor and stator I²R losses on short-circuit to be equal.
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