EGSA Cheat Sheet 2026

The 30 highest-yield EGSA facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. When two generators are operating in parallel, what is the primary role of the Automatic Voltage Regulator's (AVR) droop setting? → To ensure proportional sharing of reactive power (kVAR) between the generators.
2. A 4-pole alternator is operating at a speed of 1800 RPM. What is the frequency of the generated AC voltage? → 60 Hz
3. What is the recommended float voltage for a 12V sealed valve-regulated lead-acid (VRLA) battery? → 13.5 to 13.8V
4. A generator set is operating in isochronous mode. What will happen to the engine speed as a heavy electrical load is suddenly applied? → The speed will momentarily dip and then quickly return to the original set speed.
5. Which of the following principles is used to determine the direction of induced current in the conductors of a generator's armature? → Fleming's Right-Hand Rule
6. What is a key benefit of using load bank testing for generators? → It ensures the generator can handle its rated load and improves reliability.
7. What does the EGSA classification 'Level 1' for a generator set signify? → Failure of the equipment to perform could result in loss of human life or serious injuries
8. How does low ambient temperature affect a lead-acid battery's available capacity? → Capacity decreases significantly as temperature drops below 32°F (0°C)
9. How often should load bank testing be performed? → Annually or after major repairs.
10. What is the relationship between load bank testing and generator longevity? → It helps extend the generator’s lifespan by ensuring reliable operation.
11. What hazardous gas is produced during the charging of flooded lead-acid batteries that requires adequate ventilation? → Hydrogen
12. What is the recommended maximum storage life for diesel fuel in a properly maintained and sealed tank before polishing or testing is required? → 12 months
13. What does the Cloud Point of diesel fuel indicate? → The temperature at which wax crystals begin to form, clouding the fuel
14. What is 'block loading' and why is it a concern for generator operation? → Applying a large electrical load all at once, which can cause voltage and frequency dips
15. Which type of fuel tank is most commonly required for generator installations at critical facilities to meet NFPA 110 Level 1 requirements? → Double-wall sub-base or underground tank with leak detection
16. What type of battery charger is preferred for maintaining standby generator batteries because it automatically adjusts output to maintain a constant voltage? → Constant-voltage (float) charger
17. What is paralleling in generator systems? → Connecting two or more generators to work together to supply a common electrical load
18. What is the purpose of thermal imaging in troubleshooting electrical systems? → To detect overheating components and identify potential faults.
19. What is the role of a transformer in a power generation system? → To adjust the voltage levels for efficient transmission.
20. What is the correct specific gravity reading for a fully charged lead-acid battery cell at 77°F (25°C)? → 1.265 to 1.285
21. When sizing a day tank for a diesel generator set, which factor is most critical to determine tank capacity? → Engine fuel consumption rate at full load multiplied by required runtime
22. What conditions must be matched before paralleling two generators? → Voltage, frequency, phase angle, and phase rotation must all be matched
23. What is the main function of power generation equipment? → To convert mechanical energy into electrical energy.
24. What is the primary purpose of a battery equalizing charge? → To balance cell voltages and reverse sulfation in flooded lead-acid batteries
25. What is a key advantage of renewable power generation equipment? → It reduces environmental impact and reliance on fossil fuels.
26. What does the efficiency of a generator refer to? → The percentage of input energy converted to output energy.
27. What does the Cold Cranking Ampere (CCA) rating of a battery indicate? → The current the battery can deliver for 30 seconds at 0°F while maintaining at least 7.2V
28. What NEC article governs the wiring requirements for emergency systems, including circuits supplied by on-site generators? → Article 700
29. In a synchronous generator, what is the purpose of the damper windings (or amortisseur windings) located in the rotor pole faces? → To dampen rotor oscillations and assist in starting.
30. What is the recommended practice for fuel tank bottom water removal to prevent microbial growth and corrosion? → Drain accumulated water from tank sumps periodically as part of routine maintenance