Practice Test Geeks(EGSA) Electrical Generating Systems Association Certified Practice Test
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System Troubleshooting and Maintenance Flashcards

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

Read the first 7 System Troubleshooting and Maintenance flashcards as text

  1. A three-phase generator produces balanced voltage at no load, but voltage becomes severely unbalanced under load. What is the most probable cause?

    Answer: Single-phasing due to an open stator winding or blown phase fuse

    An open stator winding or blown phase fuse causes one phase to lose voltage under load, creating severe three-phase imbalance.

  2. What does the acronym MTBF represent, and why is it significant in generator maintenance planning?

    Answer: Mean Time Between Failures — used to predict maintenance intervals and reliability

    MTBF (Mean Time Between Failures) is a reliability metric used to schedule preventive maintenance and predict when components are likely to fail.

  3. Which procedure should be performed before removing a high-voltage generator set from service for internal inspection?

    Answer: Perform a LOTO (Lockout/Tagout) procedure on all energy sources

    Lockout/Tagout (LOTO) must be applied to all energy sources before internal inspection to prevent accidental energization.

  4. A generator's starting battery consistently shows low voltage after a week of standby. The battery charger output is verified correct. What is the most likely cause?

    Answer: A parasitic load or leakage current discharging the battery between tests

    A parasitic drain or leakage current not related to the charger circuit will slowly discharge the battery between charge events.

  5. What is the function of a diesel engine's prelube system in a generator application?

    Answer: Supplies oil pressure to engine bearings before cranking to reduce startup wear

    A prelube system circulates oil through bearings before engine cranking, preventing the dry-start wear that accounts for most mechanical failures.

  6. When testing a generator's voltage regulator response to a sudden load application, the acceptable transient voltage dip and recovery time are typically specified in which document?

    Answer: The generator manufacturer's technical specification or NEMA MG-1 standards

    Generator transient response limits for voltage dip and recovery are defined in the manufacturer's technical specification and NEMA MG-1 standards.

  7. A diesel generator experiences a sudden loss of load due to a breaker trip. The resulting overspeed causes a high-RPM shutdown. What component is primarily responsible for preventing overspeed?

    Answer: The engine governor and overspeed protection relay

    The engine governor controls fuel to limit speed, and an overspeed relay provides backup shutdown protection if governor response is insufficient.