CMM Preventive & Predictive Maintenance 5

Question 1

Laser shaft alignment of a motor and pump coupling primarily helps prevent which problem?

Accepted Answer

Premature bearing and seal failure from misalignment forces

Answer

Misalignment loads bearings and seals, and precision alignment reduces vibration and extends their life.

Question 2

Vibration analysis showing high axial vibration at 1x and 2x running speed most often indicates what condition?

Accepted Answer

Shaft misalignment

Answer

Misalignment, especially angular, commonly produces strong axial readings at 1x and 2x speed.

Question 3

Monitoring differential pressure across an air handler filter bank is an example of which maintenance strategy?

Accepted Answer

Condition-based maintenance

Answer

Replacing filters when pressure drop reaches a set point bases the action on actual condition.

Question 4

For which type of asset is a run-to-failure strategy most appropriate?

Accepted Answer

Low-cost, non-critical items where failure has minimal consequences

Answer

Run-to-failure is acceptable when failure is cheap, safe, and easily corrected, such as a single light bulb in a storage room.

Question 5

What does the term 'PM optimization' typically involve?

Accepted Answer

Reviewing PM tasks to remove non-value tasks, adjust frequencies, and add condition-based tasks

Answer

PM optimization refines the existing program so each task addresses a real failure mode at the right interval.

CMM - Certified Building Maintenance Manager Practice Test