RAM Preventive & Predictive Maintenance 2

Question 1

Which statistical distribution is most commonly used to model equipment wear-out failures when establishing time-based preventive maintenance intervals?

Accepted Answer

Weibull distribution

Answer

The Weibull distribution is preferred for wear-out failure modeling because its shape parameter (β) allows it to represent increasing, constant, or decreasing failure rates.

Question 2

A predictive maintenance program detects a bearing vibration signature showing sidebands around the fundamental frequency. This pattern most likely indicates:

Accepted Answer

Modulation caused by gear mesh or bearing defects

Answer

Sidebands around a fundamental frequency are characteristic of amplitude or frequency modulation, typically caused by gear mesh problems or bearing defect frequencies.

Question 3

What is the primary purpose of an oil analysis ferrography test in predictive maintenance?

Accepted Answer

Identify wear particle morphology and concentration to diagnose failure mode

Answer

Ferrography separates and examines wear particles by size and shape, allowing analysts to identify the type of wear occurring (sliding, fatigue, cutting) and its severity.

Question 4

Under a condition-based maintenance (CBM) strategy, a maintenance action is triggered when:

Accepted Answer

A monitored parameter crosses a defined alert or action threshold

Answer

CBM initiates maintenance based on the actual condition of equipment, measured by physical parameters like vibration, temperature, or wear debris, compared against set thresholds.

Question 5

When calculating the P-F interval in predictive maintenance, 'P' represents the point where:

Accepted Answer

A potential failure can first be detected

Answer

In the P-F curve, P is the point at which a potential failure becomes detectable by inspection or monitoring, before it progresses to functional failure at F.

(RAM) Reliability, Availability, and Maintainability Certified Professional Practice Test

(RAM) Reliability, Availability, and Maintainability Certified Professional Practice Test

RAM Preventive & Predictive Maintenance 2