Question

An automotive alternator is rated 500 VA and 20 V . It delivers its rated voltamperes at a power factor of 0.85 . The resistance per phase is $0.05 \Omega$, and the field takes 2 A at 12 V . If the friction and windage loss is 25 W and the core loss is 30 W , calculate the percent efficiency under rated conditions. 

   An automotive alternator is rated 500 VA and 20 V . It delivers its rated voltamperes at a power factor of 0.85 . The resistance per phase is $0.05 \Omega$, and the field takes 2 A at 12 V . If the friction and windage loss is 25 W and the core loss is 30 W , calculate the percent efficiency under rated conditions.
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Principles and Applications of Electrical Engineering
Principles and Applications of Electrical Engineering
Giorgio Rizzoni,… 7th Edition
Chapter 15, Problem 39 ↓
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An automotive alternator is rated 500 VA and 20 V . It delivers its rated voltamperes at a power factor of 0.85 . The resistance per phase is $0.05 \Omega$, and the field takes 2 A at 12 V . If the friction and windage loss is 25 W and the core loss is 30 W , calculate the percent efficiency under rated conditions.
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