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Which of the following environmental controls is appropriate
to protect computer equipment against short-term reductions
in electrical power?
A. Power line conditioners
B. A surge protective device
C. An alternative power supply
D. An interruptible power supply
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Answer: A
Power line conditioners are used to compensate for peaks and
valleys in the power supply and reduce peaks in the power
flow to what is needed by the machine. Any valleys are
removed by power stored in the equipment. Surge protection
devices protect against high voltage bursts. Alternative
power supplies are intended for computer equipment running
for longer periods and normally are coupled with other
devices such as an uninterruptible power supply (UPS) to
compensate for the power loss until the alternate power
supply becomes available. An interruptible power supply
would cause the equipment to come down whenever there was a
power failure.
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