Electro Magnetic Induction And Alternating Currents Question 238

Question: An electric motor operates on a 50 volt supply and a current of 12A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor [Kerala PET 2002]

Options:

A) 6Ω

B) 4Ω

C) 2.9,Ω

D) 3.1Ω

Show Answer

Answer:

Correct Answer: C

Solution:

η=eE×100e=0.3 E

Now, i=EeR12=50(0.3×50)RR=2.9Ω



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