For a certain machine having γ = 1.8, we are using starter with 5 steps. What will be the resistance at step 3 if step 2 resistance is equal to 2 Ω?(a) 2.111(b) 1.111(c) 3.6(d) 10.8I have been asked this question in an internship interview.This interesting question is from Starting of DC Motors topic in chapter DC Motors of DC Machines

For a certain machine having γ = 1.8, we are using starter with 5 ste

1.	For a certain machine having γ = 1.8, we are using starter with 5 steps. What will be the resistance at step 3 if step 2 resistance is equal to 2 Ω?(a) 2.111(b) 1.111(c) 3.6(d) 10.8I have been asked this question in an internship interview.This interesting question is from Starting of DC Motors topic in chapter DC Motors of DC Machines
Answer» Correct option is (b) 1.111 The explanation: γ is defined so as to calculate STEP resistance from the given MAXIMUM limit of current and minimum limit of the same. This γ = rn/rn-1. So, for calculating resistance at step 3 we’ll SUBSTITUTE the corresponding VALUES in the equation, which will give step 3 resistance as 1.1111Ω.

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