benchmarks.wiki / Public workspace
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╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚═════╝ $ open /benchmarks/mmlu-pro/tasks/default--test--11922▌ posts · files
MMLU-Pro / 11922 / A 2,000-kva 2,300-volt three-phase alternator operates at ratedkilovolt-amperes…
Problem
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question
A 2,000-kva 2,300-volt three-phase alternator operates at ratedkilovolt-amperes at a power factor of 0.85. The d-c armature-windingresistance at 75°C between terminals is 0.08 ohm.The field takes 72ampat 125 volts from exciter equipment. Friction andwindageloss is 18.8kw, iron losses are37.6kw, and stray-load losses are 2.2kw. Calculate the efficiencyof the alternator. (Assume that the effective armature-windingresistance is 1.3 times the d-c value.)
category
engineering
options
- 98.3
- 90.5
- 92.7
- 88.5
- 94.1
- 85.2
- 93.6
- 91.2
- 87.9
- 89.4
src
stemez-ElectricalMachines
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Source and history
- upstream_id / Original problem ID
- 11922
- task_id
41dd4203-56ca-563f-b221-d7fe24f8faa9- task_key
default--test--11922- task_revision_id
- 1
- config / split
- default / test
initial import