question archive 1) Two DC generators are connected in parallel to supply a load of 1500 Amp
1) Two DC generators are connected in parallel to supply a load of 1500 Amp
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1) Two DC generators are connected in parallel to supply a load of 1500 Amp. One generator has an armature resistance of 0.5 and an emf 400 V, while the other has an annature resistance of 0.04 ohm and an emf of 440 V. The resistance of the shunt field are 100 ohms and 30 ohms respectively. Calculate the current l1 and I2 supplied by the individual generator and the terminal voltage V of the combination.
2. Three shunt generators operating in parallel supply a total load current of 2000 Amp. Each machine has field resistance of 40 ohms and an armature resistance of 0.02 chm. The emfs generated are 240, 242, and 245 volts respectively. Determine the current delivered by each generator.
3. Two shunt generators running in parallel supply a total load current of 2000 Amp. Each machine as a field resistance of 50 ohms and an armature resistance of 0.01 chm. The emf generated are 230 volts and 235 volts respectively. Calculate the bushar voltage and the current supplied by each machine. At what total load current will the husbar voltage be 220 volts?
4. A 100 KW, 250 V generator is paralleled with a 300 KW, 250 V generator. Both generators have the same voltage regulation. The first generator is supplying a current of 200 and the other 500 amp. What would be the current supplied by each generator. if an additional load of 600 A is connected to the bus?
5. Two shunt generators running in parallel deliver a total current of 3600 A. Each machine has a field resistance of 50 Q and an armature resistance of 0.01 0. The emf generated by each machine are 455 and 460 V respectively. Calculate the kW share of each machine.
6. Two shunt generator operating parallel give a total output of 600 A. One machine has an armature resistance of 0.02 (I and a generated voltage of 455 V and the other has an armature resistance of 0.025 n and a generator voltage of 450 V. Calculate the terminal voltage and kw output of each machine. Neglect ?eld currents.
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Answer:
1) Vt= 344.16 V Ia1= 111.68 A Ia2= 2396 A
2) Ia1= 555.7 A Ia2= 655.7 A Ia3= 805.7
3)VL = 222.46 V Ia1= 754 A Ia2 = 1254 A IL = 2491.2 A
4) Ianew= 350 A Ibnew= 950 A
5) Pg1= 684.32 kW Pg2= 904.033 kW
6) VL = 450.56 V Pg1= 100.024 kW Pg2= 170.131 kW
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