1. A 115 V do generator deliver 120A to a load. If the generator has an efficien
ID: 1442399 • Letter: 1
Question
1. A 115 V do generator deliver 120A to a load. If the generator has an efficiency of 81 percent, calculate the mechanical power needed to drive it ( HP) 2. Calculate the full load current of a 250 hp, 230 v dc motors having an efficiency of 92 percent 1. A 115 V do generator deliver 120A to a load. If the generator has an efficiency of 81 percent, calculate the mechanical power needed to drive it ( HP) 2. Calculate the full load current of a 250 hp, 230 v dc motors having an efficiency of 92 percent 2. Calculate the full load current of a 250 hp, 230 v dc motors having an efficiency of 92 percentExplanation / Answer
1.
Power = VI = 115 * 120 = 13800 Watts
Efficiency = 81 %
mechanical power needed be Pm
0.81*Pm = 13800 Watts
Pm = 17037.037 Watts = 22.847 HP
2.
Power delivered = 250 HP * 0.92 = 186425 * 0.92 Watts = 171511 Watts
Power delivered = Voltage * Curent,
full load current = Power delivered / Voltage = 171511 / 230 = 745.7 Amperes
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