NCEES Electrical Engineering 1 — Questions and Answers
Question 1: On the NCEES PE Electrical exam, Ohm's Law states that the voltage across a resistor equals:
- V = R/I
- V = IR (Correct answer)
- V = I²R
- V = I/R
Correct answer: V = IR
Ohm's Law: V = IR, where V is voltage in volts, I is current in amperes, and R is resistance in ohms.
Question 2: In NCEES PE Electrical practice, the power dissipated in a resistor R carrying current I is:
- P = V/I
- P = I²R (Correct answer)
- P = IR²
- P = V²/I
Correct answer: P = I²R
Power dissipated in a resistor is P = I²R, also expressible as P = V²/R or P = VI.
Question 3: For the NCEES PE Electrical exam, Kirchhoff's Voltage Law (KVL) states that:
- Currents entering a node equal currents leaving a node
- The algebraic sum of voltages around any closed loop equals zero (Correct answer)
- Power consumed equals power generated in a network
- Voltage divides equally among parallel resistors
Correct answer: The algebraic sum of voltages around any closed loop equals zero
KVL: the sum of all voltage rises and drops around any closed loop equals zero, reflecting conservation of energy.
Question 4: In NCEES PE Electrical exams, the impedance of an ideal capacitor C at angular frequency ω is:
- Z = jωC
- Z = 1/(jωC) (Correct answer)
- Z = jωL
- Z = R + jωL
Correct answer: Z = 1/(jωC)
Capacitive impedance Z = 1/(jωC): it decreases with increasing frequency, making capacitors act as short circuits at high frequency.
Question 5: On the NCEES PE Electrical exam, the three-phase apparent power for a balanced system is:
- S = √3 × VL × IL (Correct answer)
- S = VL × IL
- S = 3 × Vφ × Iφ × cos θ
- S = VL²/R
Correct answer: S = √3 × VL × IL
Three-phase apparent power S = √3 × VL × IL, where VL and IL are line voltage and line current respectively.
Question 6: In NCEES PE Electrical engineering, the turns ratio of a transformer relates primary and secondary voltages by:
- V1/V2 = N2/N1
- V1/V2 = N1/N2 (Correct answer)
- V1 × V2 = N1 × N2
- V1 + V2 = N1 + N2
Correct answer: V1/V2 = N1/N2
Transformer voltage ratio: V1/V2 = N1/N2 — more turns on the primary means higher primary voltage.
NCEES Electrical Engineering 1
On the NCEES PE Electrical exam, Ohm's Law states that the voltage across a resistor equals: