An air purification system is expected to operate for 510 hours after changing the filters,general cleaning and maintenance.If it takes 3 hours to perform the maintenance what is the availability of the system?
A).875
B).922
C).994
D).956
E)960

Question

Quizplus · Accepted Answer

Availability is calculated using the formula:

Availability = (operational time) / (operational time + downtime)

In this case, the operational time is 510 hours and the downtime is 3 hours (time required for maintenance).

Availability = 510 / (510 + 3) = 510 / 513 = 0.994 or 99.4%

Therefore, the best choice is C) 0.994 or 99.4%.

An Air Purification System Is Expected to Operate for 510