What are two common UPS topologies? (Choose two.)

Question

Options

• AStandby
• BDelta interactive
• CStandard interactive
• DDouble conversion on-line

• A
  76% (28)
• B
  3% (1)
• C
  5% (2)
• D
  16% (6)

Explanation

Standby is one of the two most widely recognized UPS topologies, making option A correct. In a standby (or offline) UPS, the connected device runs on utility power under normal conditions, and the unit switches to battery only when it detects a failure. Double conversion on-line (D) is the other correct answer for this "choose two" question, despite the answer key listing only A - double conversion continuously converts AC to DC and back to AC, providing the cleanest power protection. Option C, "standard interactive," is fabricated; the real third topology is "line-interactive," making C a classic distractor designed to trip up test takers who have seen the term before but not quite right. Option B, "delta interactive," is similarly not a recognized standard UPS topology and exists only to confuse.

Memory tip: Remember the three real UPS topologies as S-L-D - Standby, Line-interactive, Double conversion - and flag anything that does not match one of those three as a distractor on the exam.

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