Practice Test Geeks(CMRT) Certified Maintenance and Reliability Technician Practice Test
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Equipment Reliability Flashcards

7 cards from real CMRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Equipment Reliability flashcards as text

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

    Answer: Mass unbalance

    A dominant 1× running speed frequency is the classic signature of mass unbalance, where rotating mass is not distributed evenly around the shaft axis.

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

    Answer: Viscosity

    Viscosity measures the oil's internal resistance to flow and is the most critical property for maintaining adequate lubricant film thickness.

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

    Answer: Document the finding and schedule corrective maintenance based on severity

    Thermography findings should be documented with severity classification, then corrective action should be scheduled based on risk before the fault progresses to failure.

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

    Answer: Airborne ultrasound

    Airborne ultrasound detects high-frequency sound waves (typically 20–100 kHz) produced by bearing defects, electrical arcing, and pressurized leaks.

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

    Answer: Severe adhesive or abrasive wear in progress

    Large cutting-type ferrous particles indicate abrasive or adhesive wear where a hard material is cutting through a softer surface under load.

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

    Answer: Rotor bar defects, eccentricity, and load variations

    MCSA analyzes motor current frequency spectra to detect rotor bar cracks, air gap eccentricity, broken rotor bars, and load-related anomalies.

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

    Answer: Partial discharge testing

    Partial discharge testing detects high-frequency electromagnetic pulses from insulation voids and surface discharges, indicating insulation degradation.