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MMLU-Pro / 11389 / (i) A 120 V dc shunt motor has an armature resistance of 0.2 ohms and a brush…

Problem

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

question

(i) A 120 V dc shunt motor has an armature resistance of 0.2 ohms and a brush volt drop of 2 V. The rated full-load armature current is 75 A. Calculate the current at the instant of starting, and the percent of full load. (ii) Calculate the various values (taps) of starting resistance to limit the current in the motor of Part (i) to (a) 150 percent rated load at the instant of starting. (b) 150 percent rated load, when the counteremfis 25 percent of the armature voltage, V. (c) 150 percent rated load, when the counteremfis 50 percent of the armature voltage, V_a. (iii) Find the counteremfat full load, without starting resistance.

category

engineering

options

  1. 580 A, 770 percent, 0.80 Ω, 0.572 Ω, 0.306 Ω, 101 V
  2. 550 A, 733 percent, 0.79 Ω, 0.540 Ω, 0.300 Ω, 100 V
  3. 600 A, 800 percent, 0.90 Ω, 0.592 Ω, 0.326 Ω, 105 V
  4. 595 A, 790 percent, 0.86 Ω, 0.586 Ω, 0.316 Ω, 104 V
  5. 610 A, 813 percent, 0.88 Ω, 0.600 Ω, 0.320 Ω, 106 V
  6. 565 A, 753 percent, 0.81 Ω, 0.555 Ω, 0.308 Ω, 101 V
  7. 570 A, 760 percent, 0.82 Ω, 0.560 Ω, 0.310 Ω, 102 V
  8. 585 A, 780 percent, 0.83 Ω, 0.578 Ω, 0.312 Ω, 102 V
  9. 620 A, 827 percent, 0.91 Ω, 0.610 Ω, 0.330 Ω, 107 V
  10. 590 A, 786 percent, 0.85 Ω, 0.582 Ω, 0.316 Ω, 103 V

src

stemez-ElectricalMachines

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Source and history

upstream_id / Original problem ID
11389
task_id
16dd87d0-e793-51c6-bb98-b85f47b39d1f
task_key
default--test--11389
task_revision_id
1
config / split
default / test

Official source

initial import