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Which of the following is not an Operating System?

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If the load p.f. is 0.866, then the average p.f. the v-bank is 

1. 0.886 

2. 0.75 

3. 0.51 

4. 0.65 

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If the load p.f. is 0.866, then the average p.f. the v-bank is 0.75 

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