1. A 4-pole de generator has a wave wound armature with 792 conductors. The flux per pole is 0.0121 wbr. Determine the s

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1 A 4 Pole De Generator Has A Wave Wound Armature With 792 Conductors The Flux Per Pole Is 0 0121 Wbr Determine The S 1 (109.93 KiB) Viewed 68 times

1. A 4-pole de generator has a wave wound armature with 792 conductors. The flux per pole is 0.0121 wbr. Determine the speed at which it should run to generate 240 V at no- load. 2- When driven at 1000 rpm with a flux per pole of 0.02 wb, a dc generator has an E.M.F. of 200 V. If the speed is increased to 1100 rpm and at the same time the flux per pole is reduced to 0.019 wb, what will be the induced E.M.F.? 3- A shunt DC generator supplies 100 A at a terminal voltage of 200 V. The shunt field resistance is 50 Ohm and the armature resistance is 0.1 Ohm. The stary losses are 1 kW, Find: a- The armature E.M.F. b- The copper loss. C- The efficiency. 4- A short-shunt compound de generator supplies a current of 100 A at a voltage of 220 V. If the resistance of the shunt field is 50 Ohm, of the series field is 0.025 Ohm, of the armature is 0.05 Ohm and the iron and friction losses amount to 1000 watt, find: 8- The generator E.M.F. b- The copper losses. C- The output power of the prime mover driving the generator. d- The generator efficiency. 5. A 4-pole, 480 V D.C. shunt machine has a flux per pole of 0.04 Wb and the armature is lap-wound with 720 conductors. The shunt field resistance is 240 2 and the armature resistance is 0.02 12. Determine the speed of the machine when running as: a- Motor taking 60 A. b- Generator supplying 120 A 6- A 250 V D.C. shunt motor having armature resistance of 0.25 12 carries an armature current of 50 A and runs at 750 rpm. If the flux is reduced by 10 %. Find the new speed. Assume load torque remains the same.