What is the main function of a UPS?

Question

Options

• ATo provide battery back-up power to IT equipment
• BTo regulate the voltage of power going to the racks
• CTo distribute power from the transformer to the racks
• DTo supply diesel-generated power when the utility is out

• A
  71% (15)
• B
  5% (1)
• C
  5% (1)
• D
  19% (4)

Explanation

A UPS, or Uninterruptible Power Supply, exists specifically to keep IT equipment running during a power outage or disturbance by switching instantly to stored battery power - making option A correct. Option B describes a voltage regulator or power conditioner, which is a separate device (though some UPS units include this as a secondary feature, it is not the defining purpose). Option C describes a PDU (Power Distribution Unit), which routes power from a transformer or panel to individual racks. Option D describes a diesel generator, which produces power from fuel but takes time to start up - the UPS is what bridges that gap until the generator comes online.

Memory tip: Break down the acronym - Uninterruptible Power Supply. The key word is "uninterruptible," meaning equipment never loses power, which only battery backup can guarantee instantly.

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