Recurrent Made Easy Practice Test

The main idea is that AC generators are not run at full rated output all the time; there needs to be a margin for heat dissipation, voltage regulation, and transient conditions. For continuous operation, a safe guideline is to keep the load near about 80% of the generator’s rated kVA. That way the machine stays within its thermal limits and remains reliable under varying conditions. If the generator is rated at 50 kVA, 80% of that is 40 kVA, so 40 kVA is the practical continuous load limit. The other figures would either be well below the safe continuous load or exceed the rating, which isn’t appropriate for steady operation.