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Maintenance & Troubleshooting Flashcards

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

Read the first 7 Maintenance & Troubleshooting flashcards as text

  1. A hydraulic system loses pressure gradually when the pump is stopped and valves are closed. This symptom indicates:

    Answer: Internal leakage past a relief valve or cylinder seals

    Gradual pressure drop with pump off and valves closed points to internal leakage past worn seals or a leaking relief valve.

  2. What is the primary purpose of a lockout/tagout (LOTO) procedure before performing maintenance on machinery?

    Answer: To prevent accidental energization that could injure workers

    LOTO procedures ensure all energy sources are isolated and locked before maintenance begins, preventing accidental startup or energy release.

  3. A three-phase motor fails to start and hums loudly. One likely cause is:

    Answer: An open phase (single-phasing condition)

    Single-phasing occurs when one of the three supply phases is lost, causing the motor to hum and fail to start because it cannot develop sufficient starting torque.

  4. Which type of bearing failure leaves a pattern of evenly spaced pits or fluting marks on the raceway?

    Answer: Electrical pitting from stray current

    Electrical pitting (fluting) creates regularly spaced groove marks on bearing raceways caused by stray electrical current passing through the bearing.

  5. A gear drive emits a high-pitched whine that changes pitch with speed. This symptom most likely indicates:

    Answer: Insufficient lubrication between gear teeth

    A high-pitched whine that tracks with speed in a gearbox is a classic sign of inadequate lubrication causing metal-to-metal contact between gear teeth.

  6. What does the acronym MTTR stand for in maintenance management?

    Answer: Mean Time To Repair

    MTTR (Mean Time To Repair) is a key maintenance metric representing the average time required to restore a failed component or system to operation.

  7. When using a vibration analyzer, a dominant frequency at 1× RPM (running speed) most commonly indicates:

    Answer: Mass imbalance

    A strong vibration peak at exactly 1× running speed is the classic signature of rotating mass imbalance.