The ratio of starting to full load current for a 10kW, 400 V, 3 phase induction motor with star delta starter, given the full load efficiency as 0.86, the full load pf is 0.8 and short circuit current is 30 A at 100 V is

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ESE Electrical 2014 Paper 2: Official Paper
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  1. 1.9
  2. 1.8
  3. 2.4
  4. 3.2

Answer (Detailed Solution Below)

Option 1 : 1.9
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ST 1: UPSC ESE (IES) Civil - Building Materials
20 Qs. 40 Marks 24 Mins

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Given power output = 10 kW

Input power, 

Short circuit current at 100 V is 30 A

Short circuit at rated voltage is 

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