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) $ 6\Omega $

B) $ 4\Omega $

C) $ 2.9,\Omega $

D) $ 3.1\Omega $

Show Answer

Answer:

Correct Answer: C

Solution:

$ \eta =\frac{e}{E}\times 100\Rightarrow e=0.3\ E $

Now, $ i=\frac{E-e}{R}\Rightarrow 12=\frac{50-(0.3\times 50)}{R}\Rightarrow R=2.9\Omega $



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