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Q. A 10-kVA, 200:400-V, single-phase transformer gave these test results:
• Open-circuit test (LVwinding supplied): 200V, 3.2 A, 450 W
• Short-circuit test (HV winding supplied): 38 V, 25 A, 600 W
Compute the efficiency when the transformer delivers half its rated kVA at 0.85 power factor lagging.
The following data apply to a 100-kW, 250-V, six-pole, 1000-r/min long-shunt compound generator: no-load rotational losses 4000 W, armature resistance at 75°C = 0.015 , series-fie
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A 440-V, 60-Hz, six-pole, wye-connected, squirrel-cage induction motor with a full-load speed of 1170 r/min has the following parameters per phase referred to the stator: R 1 = 0.
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