CMRT Equipment Reliability 4

Question 1

A vibration spectrum shows a dominant frequency at exactly 1× running speed with high amplitude. What condition does this most likely indicate?

Accepted Answer

Mass unbalance

Answer

Bearing defect

Answer

Gear mesh problem

Answer

Looseness

Question 2

In oil analysis, which property indicates the oil's resistance to flow at operating temperature?

Accepted Answer

Viscosity

Answer

Total Acid Number (TAN)

Answer

Flash point

Answer

Water content

Question 3

An infrared thermography scan reveals a hot spot on a three-phase motor control panel. What is the most appropriate next action?

Accepted Answer

Document the finding and schedule corrective maintenance based on severity

Answer

Immediately shut down the panel

Answer

Apply more lubricant to the connection

Answer

Increase the cooling airflow to the panel

Question 4

Which ultrasound condition monitoring technique is most effective for detecting early-stage bearing defects and compressed-air leaks?

Accepted Answer

Airborne ultrasound

Answer

Acoustic emission testing

Answer

Impact testing

Answer

Resonance testing

Question 5

Wear particle analysis in oil shows an increase in large (>15 µm) ferrous particles with a cutting wear morphology. What does this indicate?

Accepted Answer

Severe adhesive or abrasive wear in progress

Answer

Normal break-in wear

Answer

Corrosion of ferrous components

Answer

Fatigue spalling from rolling elements

Question 6

Motor Current Signature Analysis (MCSA) is primarily used to detect which category of faults?

Accepted Answer

Rotor bar defects, eccentricity, and load variations

Answer

Lubrication deficiencies

Answer

Thermal insulation degradation only

Answer

Coupling misalignment only

Question 7

Which condition monitoring technique measures electromagnetic emissions to detect corona discharge and partial discharge in high-voltage electrical equipment?

Accepted Answer

Partial discharge testing

Answer

Vibration analysis

Answer

Infrared thermography

Answer

Oil particle counting