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MMLU-Pro / 11763 / The armature of a 230-volt shunt motor has a resistance of 0.18 ohm. If the…

Problem

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

question

The armature of a 230-volt shunt motor has a resistance of 0.18 ohm. If the armature current is not to exceed 76 amp, calculate: (a) the resistance that must be inserted in series with the armature at the instant of starting; (b) the value to which this resistance can be reduced when the armature accelerates until E_c is 168 volts; (c) the armature current at the instant of starting if no resistance is inserted in the armature circuit. (Assume a 2-volt drop at the brushes.)

category

engineering

options

  1. (a) 3.05 ohms, (b) 0.65 ohm, (c) 1,278 amp
  2. (a) 1.8 ohms, (b) 0.8 ohm, (c) 1,100 amp
  3. (a) 3.1 ohms, (b) 0.75 ohm, (c) 1,500 amp
  4. (a) 1.5 ohms, (b) 0.5 ohm, (c) 1,000 amp
  5. (a) 2.3 ohms, (b) 0.58 ohm, (c) 1,225 amp
  6. (a) 2.5 ohms, (b) 0.6 ohm, (c) 1,200 amp
  7. (a) 2.9 ohms, (b) 0.55 ohm, (c) 1,350 amp
  8. (a) 2.82 ohms, (b) 0.61 ohm, (c) 1,265 amp
  9. (a) 2.0 ohms, (b) 0.7 ohm, (c) 1,150 amp
  10. (a) 3.2 ohms, (b) 0.5 ohm, (c) 1,400 amp

src

stemez-ElectricalMachines

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Source and history

upstream_id / Original problem ID
11763
task_id
775735d2-f851-54b2-814b-6a8bd2c880a9
task_key
default--test--11763
task_revision_id
1
config / split
default / test

Official source

initial import