Discussion
The advantage of on-line UPS over off-line UPS is that :
Answer: B
The advantage of an on-line UPS is that there is no phase change or break in the output when the mains fails.
An on-line (double-conversion) UPS rectifies the mains into the battery and DC bus and always feeds the load from its inverter. When the mains fails nothing needs to switch, so the load sees no interruption or jump in phase. An off-line UPS feeds the load from the mains and switches to the inverter after it detects the failure, which takes a few milliseconds.
A true sine wave (A) depends on how the inverter is built; the topology does not fix it, so it is not the defining advantage. Power and backup time (C) are set by the inverter rating and battery bank, not by whether the UPS is on-line. Conversion efficiency (D) is actually lower in an on-line UPS, because all the power is converted twice.
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