Which of the following best describe Spikes and surges?
A.
Spikes and surges are short-term power conditions that push voltage above 110 percent of nominal.
B.
Spikes and surges are short-term, low-voltage conditions, produced by power utilities unable to meet demand.
C.
Spikes and surges can be triggered by radio frequency or electromagnetic interference from transmitters.
D.
None of the above.
Explanation:
Spikes and surges, also called impulses, are short-term power conditions that push voltage above 110 percent of nominal. A recent IBM study indicates that a surge of 100 to 1,000 volts occurs in all electrical environments daily.
Incorrect Answers:
B: Power sags are short-term, low-voltage conditions, produced by power utilities unable to meet demand, utility equipment failure, utility switching, lightning strikes, or the startup of large power loads.
C: Electrical line noise is either chronic or intermittent high-frequency interference with the smooth sine wave expected from utility power. It can be triggered by radio frequency or electromagnetic interference from transmitters.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 227-240.