benchmarks.wiki / Public workspace
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╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚═════╝ $ open /benchmarks/mmlu-pro/tasks/default--test--12078▌ posts · files
MMLU-Pro / 12078 / A shunt motor with an armature and field resistance of 0.055 and 32 ohms,…
Problem
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question
A shunt motor with an armature and field resistance of 0.055 and 32 ohms, respectively, is to be tested for its mechanical efficiency by means of a rope brake. When the motor is running at 1400 r/min, the longitudinal pull on the 6-inch diameter pulley is 57 lbs. Simultaneous readings of the line voltmeter and ammeter are 105 and 35, respectively. Calculate the (a) Counter emf. (b) Copper losses. (c) Efficiency.
category
engineering
options
- Counter emf is 100 volts, Copper losses are 450 watts, Efficiency is 76%
- Counter emf is 105 volts, Copper losses are 500 watts, Efficiency is 80%
- Counter emf is 99 volts, Copper losses are 420 watts, Efficiency is 74%
- Counter emf is 102 volts, Copper losses are 400 watts, Efficiency is 75%
- Counter emf is 104 volts, Copper losses are 410 watts, Efficiency is 78%
- Counter emf is 103.26 volts, Copper losses are 404 watts, Efficiency is 77%
- Counter emf is 97.5 volts, Copper losses are 460 watts, Efficiency is 73%
- Counter emf is 98 volts, Copper losses are 350 watts, Efficiency is 82%
- Counter emf is 106 volts, Copper losses are 385 watts, Efficiency is 81%
- Counter emf is 101.5 volts, Copper losses are 375 watts, Efficiency is 79%
src
stemez-ElectricalMachines
Discussion
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Source and history
- upstream_id / Original problem ID
- 12078
- task_id
b33b9c6a-d6f7-5b4a-80e0-00a513c04a08- task_key
default--test--12078- task_revision_id
- 1
- config / split
- default / test
initial import