Practice Test Geeks(EGSA) Electrical Generating Systems Association Certified Practice Test
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Prime Mover and Governors Flashcards

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  1. When two diesel generators are operated in parallel with droop governors, how is real load (kW) shared between them?

    Answer: Determined by the relative droop characteristics and speed settings of each governor

    Real load sharing in parallel droop operation depends on each governor's droop percentage and speed setpoint; units with less droop will pick up more load.

  2. What is the typical steady-state frequency regulation band required for generator sets used in standby power applications per NFPA 110?

    Answer: ±2 Hz

    NFPA 110 requires standby generator sets to regulate frequency within ±2 Hz (±3.3% of 60 Hz) under steady-state conditions.

  3. Which prime mover type uses combustion gases to drive a turbine wheel directly rather than a piston?

    Answer: Gas turbine engine

    A gas turbine directs high-velocity combustion gases through turbine blades, converting thermal energy to shaft rotation without pistons.

  4. In a gas turbine generator, the governor controls speed primarily by adjusting which variable?

    Answer: Fuel flow rate to the combustion chamber

    The gas turbine governor regulates speed by modulating fuel flow to the combustion chamber, controlling the energy input to the turbine.

  5. What governor parameter determines how quickly the governor corrects speed deviation after a load change?

    Answer: Gain (proportional gain)

    Governor gain (proportional gain) determines the magnitude of the corrective fuel response per unit of speed error; too high a gain causes instability.

  6. Which condition is most likely to cause a diesel engine prime mover to 'hunt' (oscillate in speed)?

    Answer: Governor gain set too high or stability adjustments incorrect

    Hunting occurs when governor gain is too high or stability (derivative) is improperly set, causing the governor to overcorrect and create oscillations.

  7. What is the role of the 'speed droop' trim control on an electronic governor?

    Answer: Adjusts the amount of speed decrease per unit of load increase

    The speed droop trim control adjusts what percentage the engine speed decreases as the generator load increases from no-load to full load.