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The advantage of the double squirrel cage induction motor over a single cage rotor is that its _______

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The advantage of the double squirrel cage induction motor over a single cage rotor is that its _______

(a) Efficiency is higher

(b) Power factor is higher

(c) Slip is larger

(d) Starting current is lower

I got this question in an online interview.

My question comes from Speed Control of Shunt or Separately Excited Motors topic in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Correct choice is (d) Starting current is lower

To elaborate: The starting current flows through the outer cage which has higher resistance and hence starting current is lower. This is one the important advantage of the double squirrel cage induction motor over a single cage rotor.

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