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A d.c. shunt generator delivers 50 kW at 250 V when running at 400 r.p.m. The armature and fieldresistances are 0.02 and 50 ohm, respectively. Calculate the speedof the same machine when running as a shunt motor taking 50 kWinput at 250 V. Allow 1 V per brush for contact drop.
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A 200 V, 1200 r / min, 30 A, dc shunt motor drives a ventilating fan whose torque requirement is proportional to the speed squared. The resistances of shunt-field and armature windings are 100 and 0.15 ohms, respectively. Neglecting rotational losses and armature reaction, determine: a. The starting current of the motor. b. The resistance that must be inserted in series with the armature to produce a motor speed of 1000 r / min. c. The resistance of the field rheostat that must be connected in
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