Amazon Maintenance Technician Preventive Maintenance & Lubrication 2

Question 1

Which technique uses infrared thermography during PM inspections to identify problems in electrical panels?

Accepted Answer

Thermal imaging

Answer

Thermal imaging cameras detect abnormal heat signatures in electrical connections, identifying loose connections or overloaded components before failure.

Question 2

What is the correct procedure when mixing two different grease types during a PM?

Accepted Answer

Avoid mixing; if switching, purge old grease completely before applying the new type

Answer

Different grease thickener systems (lithium, calcium, polyurea) can be chemically incompatible, causing softening or hardening that leads to bearing failure.

Question 3

What is the purpose of vibration analysis in a predictive/preventive maintenance program for motors?

Accepted Answer

Detect imbalance, misalignment, bearing wear, or looseness before catastrophic failure

Answer

Vibration signatures identify mechanical faults such as unbalance, misalignment, and bearing defects, allowing scheduled repair before unplanned breakdown.

Question 4

A conveyor drive chain shows elongation (stretch) during a PM inspection. What action should be taken?

Accepted Answer

Measure elongation against manufacturer's wear limit; replace if it exceeds 3% elongation

Answer

Chain elongation of 3% or more indicates significant pin and bushing wear; continued use risks sprocket damage and sudden chain failure.

Question 5

What is the primary difference between time-based and condition-based maintenance strategies?

Accepted Answer

Time-based replaces parts on a fixed schedule; condition-based replaces them when monitoring data indicates degradation

Answer

Time-based PM replaces parts at fixed intervals regardless of condition; condition-based maintenance (CBM) uses real-time data to trigger maintenance only when needed.

Amazon Practice Test

Amazon Practice Test

Amazon Maintenance Technician Preventive Maintenance & Lubrication 2