A momentary power outage is a: 

Answer options:

A. spike
B. blackout
C. surge
D. fault

D

A momentary power outage is a fault. Power Excess - Spike--> Too much voltage for a short period of time. Surge --> Too much voltage for a long period of time. Power Loss - Fault--> A momentary power outage. Blackout --> A long power interruption. Power Degradation - Sag or Dip--> A momentary low voltage. Brownout--> A prolonged power supply that is below normal voltage. Reference(s) used for this question: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, 3rd. Edition McGraw-Hill/Osborne, 2005, page 368. and https://en.wikipedia.org/wiki/Power_quality