CMM Preventive & Predictive Maintenance 2

Question 1

On the P-F curve, what does the interval between point P and point F represent?

Accepted Answer

The time between a detectable potential failure and functional failure

Answer

The P-F interval is the warning window between when a failure becomes detectable (P) and when the asset can no longer perform its function (F).

Question 2

As a general rule, how often should a condition-monitoring inspection be performed relative to the P-F interval?

Accepted Answer

At an interval shorter than the P-F interval, often about half of it

Answer

Inspecting at less than the P-F interval (commonly half) ensures the developing failure is caught before it becomes functional.

Question 3

Which predictive technology is best suited for detecting loose or overheated electrical connections in a switchgear panel?

Accepted Answer

Infrared thermography

Answer

Loose or corroded connections create resistance and heat, which infrared cameras detect without contact.

Question 4

Vibration analysis on a centrifugal pump shows a dominant peak at 1x running speed in the radial direction. What is the most likely cause?

Accepted Answer

Rotor imbalance

Answer

Imbalance typically produces a strong radial vibration peak at one times running speed.

Question 5

A building maintenance manager wants to reduce PM labor without increasing failures. Which approach best fits this goal?

Accepted Answer

Shift time-based tasks with random failure patterns to condition-based monitoring

Answer

Time-based PM is ineffective for random failures, so condition-based tasks reduce wasted labor while still catching problems.

CMM - Certified Building Maintenance Manager Practice Test