ASQ
CRE · Question #78
What is the reliability of the power switching system schematic on the left after 30,000 hours ? The electric utility primary power system (A) has a failure rate of 0.00001 failure/hour. The motor…
The correct answer is A. 0.75. See the full explanation below for the reasoning.
System Reliability
Question
What is the reliability of the power switching system schematic on the left after 30,000 hours ? The electric utility primary power system (A) has a failure rate of 0.00001 failure/hour. The motor generator backup system (B) has a failure rate of 0.0007 failure/hour. The standby system has an imperfect switch with 0.90 reliability per operation.
Options
- A0.75
- B0.80
- C0.87
- D0.83
How the community answered
(54 responses)- A83% (45)
- B11% (6)
- C2% (1)
- D4% (2)
Topics
#standby redundancy#system reliability#exponential distribution#imperfect switching
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