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MMLU-Pro / 11831 / voltage = 250J = 1.2 n-m-sec^2 line current = 95 amperes speed = 863 rpm…

Problem

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question

voltage = 250J = 1.2 n-m-sec^2 line current = 95 amperes speed = 863 rpm armature resistance = 0.10 ohm field resistance = 225 ohms The d-c machine is to be used as a separately excited generator. It is to deliver a full load current of 95 amperes at a voltage of 250 when driven at a constant speed of 900 rpm. The field is supplied from a constant voltage source of 250 volts. Determine, (a) the gross field circuit resistance and field current for the stated full load conditions, (b) the electromagnetic torque and power, (c) the no load terminal voltage and the voltage regulation in percent.

category

engineering

options

  1. gross field circuit resistance and field current: 220 ohms, 1.2 amp; electromagnetic torque and power: 260 newton-meters, 25,000 watts; no-load terminal voltage and voltage regulation: 260 volts, 3.5%
  2. gross field circuit resistance and field current: 210 ohms, 1.3 amp; electromagnetic torque and power: 270 newton-meters, 24,000 watts; no-load terminal voltage and voltage regulation: 270 volts, 4.5%
  3. gross field circuit resistance and field current: 222 ohms, 1.13 amp; electromagnetic torque and power: 263 newton-meters, 24,400 watts; no-load terminal voltage and voltage regulation: 263 volts, 5.2%
  4. gross field circuit resistance and field current: 200 ohms, 1.5 amp; electromagnetic torque and power: 250 newton-meters, 23,000 watts; no-load terminal voltage and voltage regulation: 250 volts, 4%
  5. gross field circuit resistance and field current: 225 ohms, 1.1 amp; electromagnetic torque and power: 248 newton-meters, 22,320 watts; no-load terminal voltage and voltage regulation: 248 volts, 0.8%
  6. gross field circuit resistance and field current: 235 ohms, 1.06 amp; electromagnetic torque and power: 258 newton-meters, 23,700 watts; no-load terminal voltage and voltage regulation: 258 volts, 3.2%
  7. gross field circuit resistance and field current: 230 ohms, 1.09 amp; electromagnetic torque and power: 265 newton-meters, 24,800 watts; no-load terminal voltage and voltage regulation: 265 volts, 6%
  8. gross field circuit resistance and field current: 215 ohms, 1.16 amp; electromagnetic torque and power: 255 newton-meters, 23,500 watts; no-load terminal voltage and voltage regulation: 255 volts, 2%
  9. gross field circuit resistance and field current: 240 ohms, 1.04 amp; electromagnetic torque and power: 253 newton-meters, 22,770 watts; no-load terminal voltage and voltage regulation: 253 volts, 1.2%
  10. gross field circuit resistance and field current: 218.3 ohms, 1.144 amp; electromagnetic torque and power: 261 newton-meters, 24,650 watts; no-load terminal voltage and voltage regulation: 259.5 volts, 3.8%

src

stemez-ElectricalMachines

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Source and history

upstream_id / Original problem ID
11831
task_id
0a0b2846-848c-5c78-b430-3b6bcde12214
task_key
default--test--11831
task_revision_id
1
config / split
default / test

Official source

initial import