Practice Test Geeks(EGSA) Electrical Generating Systems Association Certified Practice Test
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Power Generation Equipment 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 Power Generation Equipment flashcards as text

  1. What does a generator's voltage regulator sense to provide reactive power load sharing between paralleled units?

    Answer: Reactive power output (kVAR) via a cross-current compensation circuit

    Cross-current compensation (reactive droop) allows AVRs to sense and adjust excitation based on reactive current, ensuring proportional kVAR sharing between paralleled generators.

  2. Which insulation class designation indicates that a generator winding can operate at a maximum temperature of 155°C?

    Answer: Class F

    Class F insulation has a maximum continuous operating temperature of 155°C (including a 40°C ambient and temperature rise allowance).

  3. What is the significance of the generator's Telephone Influence Factor (TIF) rating?

    Answer: Quantifies harmonic content weighted by telephone interference sensitivity

    TIF is a weighted harmonic factor that quantifies how much a generator's voltage waveform could induce interference into nearby telephone circuits.

  4. What condition triggers a 'reverse power' (anti-motoring) relay on a generator paralleled to the utility?

    Answer: Generator begins drawing real power from the bus instead of supplying it

    A reverse power relay detects when real power flow reverses direction and the engine is being motored by the bus, protecting the prime mover from damage.

  5. In a critical facility using an automatic transfer switch (ATS), what is the 'time delay to transfer' (TDT) setting used for?

    Answer: Prevent transfer for momentary utility outages shorter than the set delay

    The time delay to transfer prevents nuisance transfers for brief utility interruptions, only initiating generator start and transfer if the outage persists beyond the TDT setting.

  6. What is the minimum recommended coolant concentration of ethylene glycol antifreeze for freeze protection in most US climates?

    Answer: 50–70%

    A 50–70% ethylene glycol concentration provides freeze protection down to approximately -34°C to -55°C, covering virtually all US climates, and also offers adequate corrosion protection.

  7. What does the load acceptance test specified in NFPA 110 verify for a Level 1 EPSS generator?

    Answer: That the generator accepts 100% rated load within 10 seconds of start command

    NFPA 110 Level 1 requires the generator to pick up 100% of its rated load within 10 seconds of receiving the start signal to ensure life-safety loads are powered promptly.