A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mW and a total field-circuit resistance of 55 W. Answer the following and explain why you chose that answer. (i)         What is the motor armature current? 99 A 102 A 107 A 110 A 115 A

Delmar's Standard Textbook Of Electricity
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Chapter5: Resistors
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A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mW and a total field-circuit resistance of 55 W.

Answer the following and explain why you chose that answer.

(i)         What is the motor armature current?

  • 99 A
  • 102 A
  • 107 A
  • 110 A
  • 115 A

 

(ii)        What is the CEMF developed in the armature?

  • 9 V
  • 0 V
  • 1 V
  • 3 V
  • 5 V

 

(iii)       What is the total windings (copper) losses in the motor?

  • 5 W
  • 1 W
  • 0 W
  • 1145 W
  • 1 W

 

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