RCDD · Question #139
You have been asked to provide a UPS that is always serving the load from its batteries and the electrical supply is used only to recharge the batteries. Which one of the following types of UPS will…
The correct answer is C. Online double conversion. An online double-conversion UPS continuously converts incoming AC power to DC (charging the batteries) and then immediately inverts it back to AC to power the load. The load is always isolated from raw utility power and always runs from the inverter - the utility never directly…
Question
You have been asked to provide a UPS that is always serving the load from its batteries and the electrical supply is used only to recharge the batteries. Which one of the following types of UPS will meet this requirement?
Options
- AOff line, standby
- BLine interactive
- COnline double conversion
- DRotary
- EFlywheel
How the community answered
(46 responses)- A2% (1)
- B7% (3)
- C80% (37)
- D9% (4)
- E2% (1)
Explanation
An online double-conversion UPS continuously converts incoming AC power to DC (charging the batteries) and then immediately inverts it back to AC to power the load. The load is always isolated from raw utility power and always runs from the inverter - the utility never directly serves the load. This provides the highest level of power conditioning and zero transfer time. By contrast, offline/standby UPS units pass utility power directly to the load and only switch to battery on failure; line-interactive UPS units regulate voltage but also pass utility power under normal conditions. Rotary and flywheel UPS types use mechanical energy storage and do not match this battery-centric description.
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