Practice Test Geeks(EGSA) Electrical Generating Systems Association Certified Practice Test
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Battery and Starting Systems 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.

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  1. What does the Cold Cranking Ampere (CCA) rating of a battery indicate?

    Answer: The current the battery can deliver for 30 seconds at 0°F while maintaining at least 7.2V

    CCA is defined as the discharge load in amperes that a battery can sustain for 30 seconds at 0°F (−18°C) while maintaining a terminal voltage of at least 7.2V for a 12V battery.

  2. What is the correct specific gravity reading for a fully charged lead-acid battery cell at 77°F (25°C)?

    Answer: 1.265 to 1.285

    A fully charged lead-acid battery cell should have a specific gravity between 1.265 and 1.285 when measured at the standard reference temperature of 77°F (25°C).

  3. What is the primary purpose of a battery equalizing charge?

    Answer: To balance cell voltages and reverse sulfation in flooded lead-acid batteries

    An equalizing charge applies a controlled overcharge to balance cell voltages across a battery string and help reverse mild sulfation that accumulates during normal cycling.

  4. When two 12V, 100 Ah batteries are connected in series, what is the resulting voltage and capacity?

    Answer: 24V, 100 Ah

    Series connections add voltages while keeping capacity the same, so two 12V 100 Ah batteries in series produce 24V at 100 Ah.

  5. Which type of starting motor is most commonly used on diesel generator sets due to its high torque at low speeds?

    Answer: Series-wound DC motor

    Series-wound DC motors produce maximum torque at startup and low speeds, making them ideal for engine cranking applications where high breakaway torque is required.

  6. What is the recommended float voltage for a 12V sealed valve-regulated lead-acid (VRLA) battery?

    Answer: 13.5 to 13.8V

    VRLA batteries are typically maintained on float charge between 13.5V and 13.8V for a 12V battery to keep them fully charged without overcharging.

  7. What is the function of a battery disconnect switch on a standby generator set?

    Answer: To isolate the battery from the DC system for maintenance or to prevent parasitic drain

    A battery disconnect switch allows safe isolation of the battery from all DC loads and chargers for maintenance, troubleshooting, or long-term storage to prevent parasitic discharge.