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
What is the purpose of a kW transducer in a generator paralleling system?
Answer: Convert real power output to a DC signal for the load sharing controller
A kW transducer converts the generator's real power (kW) output into a proportional DC signal used by the load sharing module to balance load between paralleled units.
Which of the following best describes the function of a generator's subtransient reactance (X''d)?
Answer: Controls the first few cycles of fault current immediately after a short circuit
Subtransient reactance governs fault current magnitude during the first few cycles after a short circuit, which is critical for sizing protective devices.
A generator nameplate shows 500 kVA at 0.8 PF. What is its rated kW output?
Answer: 400 kW
Real power (kW) = kVA × power factor = 500 × 0.8 = 400 kW.
What is the role of the dead bus close logic in a generator automatic transfer sequence?
Answer: Allows the generator breaker to close onto a de-energized (dead) bus without synchronization check
Dead bus logic bypasses the sync check relay and allows immediate closure of the generator breaker when the bus has no voltage, shortening transfer time during outages.
Which engine cooling system component is responsible for maintaining a minimum coolant temperature during light-load operation?
Answer: Coolant thermostat
The coolant thermostat restricts coolant flow to the radiator until the engine reaches its designed operating temperature, preventing overcooling at light loads.
In a three-phase generator, what is the phase angle difference between each phase voltage?
Answer: 120 degrees
Three-phase generators produce voltages separated by 120 electrical degrees, providing balanced polyphase power delivery.
What does the term 'prime power rating' indicate for a generator set?
Answer: Continuous power available for unlimited hours with 10% overload capability for 1 hour per 12 hours
Prime power rating is the maximum power a generator can deliver continuously for unlimited hours with a variable load, plus a 10% overload allowance for short periods.