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MMLU-Pro / 11766 / A 125-kW, 250-V, 1800-rev/min, cumulative compound d-c generator has the…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A 125-kW, 250-V, 1800-rev/min, cumulative compound d-c generator has the following winding resistances: r_a = 0.025\Omegar_se = 0.010\Omegar_f = 30\Omega The machine is long-shunt connected. Its stray-power loss at rated voltage and 1800 rev/min is 5000 W. When operated at rated speed, load, and terminal voltage, the shunt-field current is 5A. Find the efficiency and input horsepower requirements under these conditions.

category

engineering

options

  1. 90%, 200 hp
  2. 87.5%, 195 hp
  3. 84.7%, 175 hp
  4. 88.1%, 190.3 hp
  5. 89.5%, 205 hp
  6. 87.2%, 198 hp
  7. 83.5%, 170 hp
  8. 85%, 180 hp
  9. 92%, 210 hp
  10. 86.3%, 185 hp

src

stemez-ElectricalMachines

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Source and history

upstream_id / Original problem ID
11766
task_id
48bb5d95-382b-5d64-9c4f-d1609506076a
task_key
default--test--11766
task_revision_id
1
config / split
default / test

Official source

initial import