Electrical Engineering PE Exam Flashcards
6 cards from real NCEES practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrical Engineering PE Exam flashcards as text
On the NCEES PE Electrical exam, what is the 'skin effect' in AC conductors?
Answer: The tendency for AC current to concentrate near the conductor surface, increasing effective resistance
At high frequencies, electromagnetic effects force AC current to flow near the conductor surface, reducing the effective cross-sectional area and increasing resistance above its DC value.
In the NCEES PE Electrical exam, what does 'voltage regulation' of a transformer measure?
Answer: The percentage change in secondary voltage from no-load to full-load
Voltage regulation = (VNL - VFL)/VFL × 100%, measuring how much the secondary terminal voltage drops from no-load to full-load condition.
For the NCEES PE Electrical exam, which NEC article governs the installation of electrical wiring in commercial and industrial facilities?
Answer: Article 300 (Wiring Methods and Materials)
NEC Article 300 establishes general requirements for wiring methods and materials, covering conductor installation, raceway fill, and physical protection for commercial/industrial wiring.
On the NCEES PE Electrical exam, what is the purpose of 'protective relaying' in a power system?
Answer: To detect abnormal conditions and rapidly isolate faulted equipment to limit damage
Protective relays detect faults (overcurrent, undervoltage, differential currents) and send trip signals to circuit breakers to quickly isolate the faulted section and protect equipment.
In the NCEES PE Electrical exam, what does the 'grounding electrode system' required by NEC Article 250 accomplish?
Answer: Provides a low-impedance path for fault current to return to the source, enabling overcurrent device operation
The grounding electrode system stabilizes voltage during normal operation and provides a fault-return path that enables overcurrent devices to operate and clear ground faults safely.
For the NCEES PE Electrical exam, which motor type has speed directly proportional to supply frequency and number of poles?
Answer: Synchronous motor
Synchronous motors run exactly at synchronous speed (Ns = 120f/P), directly proportional to supply frequency and inversely proportional to the number of poles.
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