Electro Magnetic Induction And Alternating Currents Question 233

Question: Armature current in dc motor will be maximum when [CPMT 1986, 88; MP PET 1995]

Options:

A) Motor has acquired maximum speed

B) Motor has acquired intermediate speed

C) Motor has just started moving

D) Motor is switched off

Show Answer

Answer:

Correct Answer: C

Solution:

Motor e.m.f. equation $ E_{b}=V-I_{a}R_{a} $ At starting $ E_{b}=0, $ so $ I_{a} $ will be maximum.



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