ITPEC IP April 2018 Question 59
The private power generator is installed to protect a business server against electric power failure, but it takes one minute to provide a stable power supply after the power failure is detected. Which of the following devices is necessary to supply temporary power to the server during that one-minute period?
Explanation
UPS — an uninterruptible power supply bridges the gap from the moment power fails until the generator is supplying stable power.
A UPS keeps a battery charged and switches to it the instant the mains power fails, so the server keeps running without interruption. The battery lasts only minutes, which is enough to cover the one minute the private generator needs, or to shut the server down in an orderly way. The generator then supplies power for as long as it has fuel.
Answer (c)
Why not others:
- •(a) A/D converter — converts analog signals into digital data; it supplies no power
- •(b) RAID — combines several disks for speed or to survive a disk failure; it does nothing when power is lost
- •(d) Firewall — filters network traffic for security, unrelated to power
Key rule: A UPS covers seconds to minutes with an instant switch-over, a generator covers hours; they are combined so that the UPS carries the load while the generator starts.
Service Management · AI-written, may contain errors
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