NCEES Electrical Engineering PE Exam

Question 1

On the NCEES PE Electrical exam, what does the 'power factor' of an AC circuit represent?

Accepted Answer

The ratio of real power to apparent power (cos θ)

Answer

The ratio of reactive power to apparent power

Answer

The efficiency of the electrical generator

Answer

The ratio of voltage to current magnitude

Question 2

In the NCEES PE Electrical exam, what is the purpose of a 'per-unit system' in power systems analysis?

Accepted Answer

To normalize quantities to a common base, simplifying calculations across transformers and voltage levels

Answer

To measure power in SI units only

Answer

To convert three-phase to single-phase equivalents

Answer

To eliminate reactive power from calculations

Question 3

For the NCEES PE Electrical exam, which protection device operates based on time-current characteristics to interrupt overcurrents?

Accepted Answer

Overcurrent relay (inverse time)

Answer

Surge arrester

Answer

Capacitor bank

Answer

Voltage regulator

Question 4

On the NCEES PE Electrical exam, what is the 'synchronous reactance' of a synchronous generator?

Accepted Answer

The effective internal reactance that determines voltage regulation and fault current

Answer

The resistance of the generator windings at DC

Answer

The reactance of the transmission line connected to the generator

Answer

The magnetic reluctance of the rotor core

Question 5

In the NCEES PE Electrical exam, what does 'short-circuit MVA' (fault MVA) represent?

Accepted Answer

The magnitude of power available during a three-phase fault at a bus

Answer

The rated power of circuit breakers in MVA

Answer

The motor starting apparent power

Answer

The transformer inrush current in MVA

Question 6

For the NCEES PE Electrical exam, which transformer connection is most commonly used to supply a four-wire distribution system from a three-phase source?

Accepted Answer

Delta-Wye with grounded neutral

Answer

Delta-Delta

Answer

Wye-Delta

Answer

Open-Delta