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Actual speed obtained at any value of armature current comparing to speed obtained by assuming linear magnetic assumption in DC series motor is _______(a) Same(b) Higher(c) Lower(d) Cannot sayI have been asked this question in final exam.My question is based upon Operating Characteristics of DC Series Motor topic in section Characteristics of DC Motors of DC Machines

Answer»

Correct choice is (b) Higher

The explanation is: From SPEED current characteristics of a DC series MOTOR is easily seen that, initial value of speeds in both of the cases is same or RATHER infinite, but as a armature current or load current increases speed starts dropping down relatively more in the CASE of linear magnetization.



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