CMRT Corrective Maintenance Procedures 3

Question 1

Which root cause analysis tool uses a series of 'why' questions to drill down to the underlying cause of an equipment failure?

Accepted Answer

5 Whys analysis

Answer

The 5 Whys technique iteratively asks 'why' until the physical, human, and latent root causes of a failure are identified.

Question 2

When reinstalling a press-fit bearing on a shaft using the correct corrective maintenance procedure, heat or a hydraulic press should be used to:

Accepted Answer

Expand the inner race slightly so it slides on without damaging the rolling elements

Answer

Heating the inner race causes it to expand, allowing installation without transmitting force through the rolling elements, which would damage them.

Question 3

A technician notices a motor running hotter than normal after completing a corrective bearing replacement. The MOST likely cause is:

Accepted Answer

Over-greasing the bearing, which causes churning and excessive heat

Answer

Over-greasing is one of the most common causes of premature bearing failure and motor heat; excess grease churning increases friction and temperature.

Question 4

After completing corrective maintenance on a hydraulic system, which test should be performed BEFORE returning the system to normal operating pressure?

Accepted Answer

A low-pressure leak check to verify all connections and seals are secure

Answer

A low-pressure leak check allows technicians to identify and correct any connections or seals that were disturbed before exposing the system to full pressure.

Question 5

In corrective maintenance, the term 'failure mode' refers to:

Accepted Answer

The specific way in which a component or system ceases to perform its required function

Answer

A failure mode describes the observable condition (e.g., seizure, fracture, corrosion) by which an item fails to meet its performance requirement.

(CMRT) Certified Maintenance and Reliability Technician Practice Test

(CMRT) Certified Maintenance and Reliability Technician Practice Test

CMRT Corrective Maintenance Procedures 3